Cryogenic Energy Storage Patents

Cryogenic energy storage patents cover liquefaction/charge innovations; storage/cold-recycle innovations; power-recovery/discharge innovations; and integration/efficiency innovations — with IP held by energy-storage, industrial-gas, and power companies and research organizations (in a field of liquid-air/cryogenic grid storage). WHY CRYOGENIC ENERGY STORAGE: 'CRYOGENIC ENERGY STORAGE' — most prominently LIQUID AIR ENERGY STORAGE (LAES) — stores electricity by using it to LIQUEFY air (cooling air to about -196°C until it becomes a LIQUID), storing that LIQUID AIR in insulated tanks, and later releasing the energy by letting the liquid air WARM and EXPAND back into a gas — driving a TURBINE to regenerate electricity; it's essentially a 'thermal/cryogenic BATTERY': when power is abundant/cheap, you make liquid air; when power is needed, you boil it back to drive a generator; the big APPEAL: it uses MATURE, low-cost equipment (air liquefaction and turbines are OFF-THE-SHELF industrial technology), needs NO exotic materials or rare elements, can be sited ANYWHERE (no geography needed, unlike PUMPED HYDRO), and scales to LONG-DURATION, large grid storage — exactly what a renewable grid needs; the CATCH: the basic ROUND-TRIP EFFICIENCY is modest (a lot of energy is lost in liquefying and re-expanding), so the key innovation is RECYCLING the COLD and HEAT — capturing the cold released during discharge to help liquefy more efficiently next time, and adding heat (often WASTE HEAT) during expansion — to boost efficiency; the brutal CHALLENGES: the LIQUEFACTION/CHARGE (efficiently turning electricity into liquid air), the STORAGE/COLD-RECYCLE (storing liquid air and especially RECYCLING the cold/heat — the key efficiency lever), the POWER-RECOVERY/DISCHARGE (efficiently expanding liquid air through turbines to make power), and the INTEGRATION/EFFICIENCY (boosting round-trip efficiency, integrating waste heat/cold, and the overall economics vs other long-duration storage); the make-or-break IP AREAS: the LIQUEFACTION/charge, the STORAGE/cold-recycle, the POWER-RECOVERY/discharge, and the integration/efficiency; the HARD problems: the LIQUEFACTION, COLD-RECYCLE, DISCHARGE, and EFFICIENCY. MAJOR PLAYERS: HIGHVIEW POWER, plus energy and industrial-gas companies. Liquefaction/charge, storage/cold-recycle, power-recovery/discharge, and integration/efficiency are the core cryogenic-energy-storage patent domains — and liquefaction, cold-recycle, discharge, and integration are the open whitespace. (Note: cryogenic energy storage — esp. LIQUID AIR ENERGY STORAGE (LAES) — stores electricity by LIQUEFYING air (~-196°C), storing the LIQUID AIR in insulated tanks, then warming + EXPANDING it through a turbine to regenerate power — a 'cryogenic battery' using MATURE low-cost equipment, NO exotic materials, sited ANYWHERE, scaling to LONG-DURATION storage; the catch: modest ROUND-TRIP EFFICIENCY → the key innovation is RECYCLING the COLD/HEAT; brutal challenges in efficient LIQUEFACTION, STORAGE + COLD-RECYCLE (the key lever), POWER-RECOVERY (expanders/turbines), and INTEGRATION/efficiency; process/equipment/hardware IP §101-resilient.)

Liquefaction/charge innovations; storage/cold-recycle innovations; cold-recycle innovations; and liquid-air-storage innovations represent core cryogenic-energy-storage patent domains — and the liquefaction (charging) and especially the storage/cold-recycle (the key efficiency lever) are the foundational, high-value, §101-resilient capabilities. LIQUEFACTION / CHARGE PATENTS: the CHARGING — air LIQUEFACTION (using electricity to COMPRESS and COOL air until it liquefies at ~-196°C — the charging step), efficient COMPRESSION/COOLING CYCLES (the liquefaction cycle's efficiency directly affects round-trip efficiency), and PURIFICATION (removing water/CO2 that would freeze and clog); liquefaction methods are core, high-value, DISTINCTIVE IP, §101-resilient (air LIQUEFACTION (efficient compression/cooling cycles, purification) is core, contested, defensible IP, since how efficiently electricity is turned into liquid air sets the charging efficiency). STORAGE / COLD-RECYCLE PATENTS: the STORAGE and KEY LEVER — insulated LIQUID-AIR STORAGE TANKS (storing the cryogenic liquid air with low boil-off), and especially COLD RECYCLE/STORAGE (THE CENTRAL EFFICIENCY INNOVATION — when liquid air is expanded during DISCHARGE, it releases intense COLD; capturing and STORING that cold (in a thermal/cold store) and REUSING it to pre-cool air during the next LIQUEFACTION makes charging far more efficient — dramatically boosting round-trip efficiency), plus THERMAL STORES (storing heat and cold for reuse); storage/cold-recycle methods are core, high-value, DISTINCTIVE IP, §101-resilient (COLD RECYCLE/storage (capturing and reusing the discharge cold to make liquefaction efficient) is the CENTRAL, most contested, defensible IP, since recycling the cold is exactly what lifts LAES from modest to competitive round-trip efficiency — the key differentiator). COLD-RECYCLE PATENTS: capturing and reusing discharge cold to boost liquefaction efficiency; cold-recycle methods are high-value IP, §101-resilient (cold recycle is the key efficiency lever — the central LAES innovation). LIQUID-AIR-STORAGE PATENTS: low-boil-off cryogenic liquid-air tanks/thermal stores; liquid-air-storage methods are high-value IP, §101-resilient (efficient cryogenic storage with cold/heat stores enables the cycle). Liquefaction/charge, storage/cold-recycle, cold-recycle, and liquid-air-storage are the highest-value core IP because efficient charging and (above all) recycling the cold are exactly what make cryogenic energy storage round-trip-efficient and competitive.

Power-recovery/discharge innovations; integration/efficiency innovations; expander/turbine innovations; and long-duration-storage innovations represent additional cryogenic-energy-storage patent domains — and the power recovery (discharging) and the integration/efficiency (boosting round-trip efficiency, using waste heat) turn the stored liquid air into competitive, deployable grid storage. POWER-RECOVERY / DISCHARGE PATENTS: the DISCHARGING — PUMPING/WARMING/EXPANDING liquid air (pumping the liquid air to high pressure, warming it (often with stored or waste heat) so it boils and expands powerfully into gas), driving TURBINES/EXPANDERS to regenerate electricity, HEAT ADDITION (adding heat during expansion dramatically increases the power recovered — using stored heat, waste heat, or ambient), and discharge EFFICIENCY; power-recovery methods are core, high-value, DISTINCTIVE IP, §101-resilient (the EXPANSION/TURBINE discharge (pumping/warming/expanding liquid air, heat addition, expanders) is core, contested, defensible IP, since how efficiently the liquid air is expanded — and how much heat is added — sets the power recovered). INTEGRATION / EFFICIENCY PATENTS: the VIABILITY — ROUND-TRIP EFFICIENCY improvement (the overall electricity-out/electricity-in — the headline metric, lifted by cold recycle and heat integration), WASTE-HEAT/COLD INTEGRATION (a big advantage — LAES can absorb external WASTE HEAT (from industry/power plants) during discharge to boost efficiency, and can provide cold (e.g. for industrial cooling/LNG) — co-locating with heat/cold sources improves economics), LONG-DURATION/SCALE (LAES scales easily to long durations and large sizes — its key advantage), and ECONOMICS (cost vs other long-duration storage); integration methods are high-value IP, §101-resilient when tied to the system (ROUND-TRIP efficiency improvement, WASTE-HEAT/cold integration, and long-duration scale are key value, since integrating waste heat/cold and scaling to long duration is exactly where LAES competes). EXPANDER/TURBINE PATENTS: efficient cryogenic liquid-air expanders/turbines with heat addition; expander/turbine methods are high-value IP, §101-resilient (the expander/turbine sets discharge power/efficiency). LONG-DURATION-STORAGE PATENTS: large-scale long-duration cryogenic grid storage; long-duration-storage methods/systems are high-value IP, §101-resilient (long-duration, anywhere-sited scale is LAES's core grid value). Power-recovery/discharge, integration/efficiency, expander/turbine, and long-duration-storage are the highest-value IP because efficient expansion and integration (round-trip efficiency, waste heat/cold, scale) turn stored liquid air into competitive long-duration grid storage.

Cryogenic energy storage startup IP strategy must navigate the cold-recycle-is-the-central-efficiency-IP (RECYCLING the COLD (capturing the cold released during discharge and reusing it to make the next liquefaction efficient) is the SINGLE most important innovation — it lifts LAES round-trip efficiency from modest to competitive — so cold-recycle/thermal-integration IP is the most distinctive, defensible, and decisive IP, since efficiency is LAES's main weakness and cold recycle is the main cure), the §101-resilient-process-and-equipment-are-the-strength (cryogenic-storage IP is process/equipment/thermodynamic-cycle IP — strongly §101-RESILIENT — so liquefaction, cold-recycle, discharge, and integration claims are strong (a key advantage)), the mature-cheap-off-the-shelf-equipment-is-the-core-advantage-but-limits-component-IP (LAES uses MATURE, off-the-shelf air-liquefaction and turbine equipment — a huge ADVANTAGE (low risk, low cost, no exotic materials/rare elements, bankable) — but it also means the COMPONENT IP is largely existing, so a startup's IP edge is mostly in the SYSTEM integration, cold/heat recycle, and cycle innovations, not the basic components), the long-duration-and-siting-anywhere-are-the-killer-grid-advantages (LAES scales to LONG-DURATION (many hours/days) and can be sited ANYWHERE (no special geography, unlike pumped hydro or CAES which need mountains/caverns) — so its grid value is long-duration, large-scale, geography-free storage — exactly the renewable-grid need — and a startup should target and defend this positioning), the waste-heat-and-cold-integration-boost-economics (LAES can ABSORB external WASTE HEAT (boosting discharge power) and PROVIDE cold (for industrial cooling, data centers, LNG) — so CO-LOCATING with heat/cold sources/sinks (industry, power plants, LNG terminals) dramatically improves economics — integration IP and siting strategy are high-value), the round-trip-efficiency-vs-other-storage-be-realistic (even with cold recycle, LAES round-trip efficiency (~50-70%) is LOWER than batteries (~85-90%) or pumped hydro — so LAES competes NOT on efficiency but on LONG-DURATION, SCALE, LIFETIME, cost-per-kWh-of-storage, and siting — so be realistic and compete where duration/scale/siting matter more than efficiency), the capital-cost-and-scale-economics-decide (LAES economics improve with SCALE and DURATION (the storage (tanks) is cheap, the power equipment is the fixed cost) — so it favors LARGE, long-duration installations — and demonstrated capital cost and round-trip efficiency at scale are decisive), the incumbent-and-FTO (Highview Power (the LAES leader, with significant IP and projects), plus industrial-gas companies (Air Liquide, Linde — liquefaction), turbine makers, and academia/other LAES/cryogenic-storage players have IP — so a startup needs a genuinely novel cold-recycle/cycle/integration/component edge, and FTO around Highview's and industrial-gas IP is significant), the demonstrated-efficiency-cost-and-reliability-at-scale-decide (LAES is proven by demonstrated ROUND-TRIP EFFICIENCY, capital/storage COST, DURATION, reliability, and integration benefits at real scale — so demonstrated, bankable performance is decisive, far more than patents), and a landscape where liquefaction, cold-recycle, discharge, and integration are the durable assets; understand that cold recycle is the central efficiency IP and long-duration/siting are the advantages, so the durable startup IP is in cold/heat recycle, the thermodynamic cycle, efficient discharge, and waste-heat/cold integration — with high-efficiency cold recycle, smart heat integration, and well-sited long-duration systems often the real moat, and that §101-resilient process IP, demonstrated efficiency/cost at scale, siting/integration, and FTO matter as much as patents; identify whitespace in cold recycle, cycle integration, discharge, and waste-heat utilization. CRYOGENIC ENERGY STORAGE STARTUP IP STRATEGY: LIQUEFACTION, STORAGE/COLD-RECYCLE, DISCHARGE, AND INTEGRATION ARE THE IP: patent liquefaction, cold-recycle, discharge, and integration — process/equipment/cycle claims (§101-resilient); COLD-RECYCLE-IS-THE-CENTRAL-EFFICIENCY-IP: RECYCLING the COLD (capture discharge cold + reuse it for the next liquefaction) the SINGLE most important innovation — lifts round-trip efficiency from modest to competitive — cold-recycle/thermal-integration IP the most distinctive defensible decisive IP (efficiency LAES's main weakness + cold recycle the main cure); §101-RESILIENT-PROCESS-AND-EQUIPMENT-ARE-THE-STRENGTH: process/equipment/thermodynamic-cycle IP — strongly §101-RESILIENT (liquefaction/cold-recycle/discharge/integration claims strong — a key advantage); MATURE-CHEAP-OFF-THE-SHELF-EQUIPMENT-IS-THE-CORE-ADVANTAGE-BUT-LIMITS-COMPONENT-IP: uses MATURE off-the-shelf air-liquefaction + turbine equipment (a huge ADVANTAGE — low risk/cost/no exotic materials-rare-elements/bankable) — but COMPONENT IP largely existing — the IP edge mostly in SYSTEM integration/cold-heat recycle/cycle innovations (not the basic components); LONG-DURATION-AND-SITING-ANYWHERE-ARE-THE-KILLER-GRID-ADVANTAGES: scales to LONG-DURATION (hours/days) + sited ANYWHERE (no special geography, unlike pumped-hydro/CAES) — grid value is long-duration large-scale geography-free storage (the renewable-grid need) — target + defend this positioning; WASTE-HEAT-AND-COLD-INTEGRATION-BOOST-ECONOMICS: can ABSORB external WASTE HEAT (boost discharge) + PROVIDE cold (industrial cooling/data centers/LNG) — CO-LOCATING with heat/cold sources/sinks dramatically improves economics — integration IP + siting strategy high-value; ROUND-TRIP-EFFICIENCY-VS-OTHER-STORAGE-BE-REALISTIC: even with cold recycle, efficiency (~50-70%) LOWER than batteries (~85-90%)/pumped hydro — competes NOT on efficiency but on LONG-DURATION/SCALE/LIFETIME/cost-per-kWh/siting — compete where duration/scale/siting matter more than efficiency; CAPITAL-COST-AND-SCALE-ECONOMICS-DECIDE: economics improve with SCALE + DURATION (storage tanks cheap, power equipment the fixed cost) — favors LARGE long-duration installations — demonstrated capital cost + round-trip efficiency at scale decisive; INCUMBENT-AND-FTO: Highview Power (the LAES leader — significant IP + projects) + industrial-gas (Air Liquide/Linde — liquefaction)/turbine makers/academia with IP — need a genuinely novel cold-recycle/cycle/integration/component edge + FTO around Highview + industrial-gas significant; DEMONSTRATED-EFFICIENCY-COST-AND-RELIABILITY-AT-SCALE-DECIDE: proven by ROUND-TRIP EFFICIENCY/capital-storage COST/DURATION/reliability/integration benefits at real scale — demonstrated bankable performance decisive (far more than patents); §101-RESILIENT-PROCESS/EFFICIENCY-COST-AT-SCALE/SITING/FTO MATTER AS MUCH AS PATENTS: §101-resilient process IP, demonstrated efficiency/cost at scale, siting/integration, and FTO drive value; WHEN TO PATENT: NOVEL LIQUEFACTION/COLD-RECYCLE/DISCHARGE/INTEGRATION WITH DATA: file once it shows data (liquefaction efficiency + cold-recycle/round-trip-efficiency gain + discharge power/heat-addition + integration/cost at scale) — process/equipment/cycle claims; demonstrated round-trip efficiency (with cold recycle), capital/storage cost, duration, and waste-heat/cold integration benefits are the critical LAES IP metrics; KEY FTO CHECKLIST: Highview Power + industrial-gas (Air Liquide/Linde)/turbine makers + cryogenic-storage academia; liquefaction/charge (air LIQUEFACTION-compress-cool-to-liquid/efficient compression-cooling cycles/purification — §101-resilient, the charging); storage/cold-recycle (insulated LIQUID-AIR tanks/COLD RECYCLE-storage-capture-reuse-discharge-cold-for-next-liquefaction-the-central-innovation/thermal stores — §101-resilient, the key lever); cold-recycle (the key efficiency lever); liquid-air-storage; power-recovery/discharge (PUMPING-WARMING-EXPANDING liquid air/TURBINES-EXPANDERS/HEAT ADDITION-boosts-power/efficiency — §101-resilient, the discharging); integration/efficiency (ROUND-TRIP EFFICIENCY improvement/WASTE-HEAT-COLD integration/long-duration-scale/economics — tie to system); expander/turbine; long-duration-storage (anywhere-sited scale the core grid value); cold-recycle the central efficiency IP; §101-resilient process + equipment the strength; mature cheap off-the-shelf equipment the core advantage but limits component IP; long-duration + siting-anywhere the killer grid advantages; waste-heat + cold integration boost economics; round-trip-efficiency vs other storage be realistic; capital-cost + scale economics decide; incumbent (Highview) + FTO; demonstrated efficiency + cost + reliability at scale decide.