Marine Carbon Removal Patents

Marine carbon removal patents cover ocean-alkalinity-enhancement innovations; electrochemical/direct-ocean-capture innovations; biomass-sinking/cultivation innovations; and MRV/verification and monitoring/safety innovations — with IP held by ocean-CDR companies and academia (in a field removing CO2 via the ocean). WHY MARINE CARBON REMOVAL: the OCEAN is the planet's largest carbon sink — it already absorbs roughly 25% of human CO2 emissions and holds about 50x more carbon than the atmosphere — so ENHANCING its natural CO2 uptake is a potentially HUGE-scale, durable carbon-removal (CDR) pathway; marine CDR (mCDR) takes several forms: (1) OCEAN ALKALINITY ENHANCEMENT (OAE) — adding alkaline minerals (or generating alkalinity electrochemically) to seawater, which converts dissolved CO2 into stable BICARBONATE and lets the ocean draw MORE CO2 out of the air, storing it as dissolved bicarbonate for millennia; (2) DIRECT OCEAN CAPTURE — electrochemically stripping CO2 directly OUT of seawater (seawater holds ~150x more CO2 per unit volume than air, so extraction can be more efficient than direct air capture), after which the de-carbonated water reabsorbs atmospheric CO2; and (3) BIOMASS SINKING — growing macroalgae/seaweed that captures CO2, then sinking it to the deep ocean for long-term storage; the DEFINING challenge for ALL ocean CDR is MRV — measuring and verifying how much carbon was actually removed and durably stored in the vast, turbulent ocean is genuinely hard and is the make-or-break for credible carbon credits. MAJOR HOLDERS: CAPTURA, EBB CARBON, EQUATIC, PLANETARY TECHNOLOGIES, RUNNING TIDE (macroalgae), plus academic IP. Ocean alkalinity enhancement, electrochemical/direct ocean capture, biomass sinking/cultivation, MRV/verification, and monitoring/safety are the core mCDR patent domains — and OAE, electrochemical capture, biomass sinking, and (above all) MRV are the open whitespace.

Ocean-alkalinity-enhancement innovations; electrochemical/direct-ocean-capture innovations; co-product innovations; and dosing/dispersal innovations represent core mCDR patent domains — and the chemistry/electrochemistry that makes the ocean absorb or release more CO2 are the foundational, high-value capabilities. OCEAN-ALKALINITY-ENHANCEMENT (OAE) PATENTS: increasing seawater ALKALINITY so it absorbs more atmospheric CO2 (storing it as stable bicarbonate) — by adding ground alkaline MINERALS (olivine, basalt, lime) or by generating alkalinity ELECTROCHEMICALLY (splitting seawater to produce a base) — plus methods to dose, disperse, and ensure the alkalinity is taken up safely; OAE methods/systems are core, high-value IP (OAE is a leading mCDR approach — the alkalinity-generation method and safe, effective dosing are key technical IP, and electrochemical OAE overlaps direct ocean capture). ELECTROCHEMICAL / DIRECT-OCEAN-CAPTURE PATENTS: ELECTROCHEMICALLY extracting CO2 directly from seawater — using electrodialysis/acid-base separation to acidify seawater (releasing CO2 as a concentrated stream for storage/use) and return alkaline water that reabsorbs atmospheric CO2 — exploiting seawater's high CO2 concentration; electrochemical/direct-ocean-capture methods are core, high-value, distinctive IP (electrochemical seawater CO2 extraction is a major, active mCDR approach — Captura/Equatic/Ebb — and the cell/process design is rich technical IP, often more efficient than air capture). CO-PRODUCT PATENTS: valuable CO-PRODUCTS from the electrochemistry — HYDROGEN, mineral carbonates, acid/base streams — improving economics; co-product methods are high-value IP (co-product revenue, especially hydrogen, materially helps mCDR economics — a key lever). DOSING / DISPERSAL PATENTS: efficiently dosing/dispersing alkalinity or processing seawater at scale (ship-based, coastal, co-located with desalination/outfalls); dosing/dispersal methods are high-value IP. Ocean alkalinity enhancement, electrochemical/direct ocean capture, co-products, and dosing/dispersal are the highest-value core IP because efficient, safe alkalinity generation or seawater CO2 extraction is exactly what makes ocean CDR work.

Biomass-sinking/cultivation innovations; MRV/verification innovations; monitoring/safety innovations; and durability innovations represent additional mCDR patent domains — and growing-and-sinking carbon, proving the removal, and protecting ecosystems are where credibility and the central challenge lie. BIOMASS-SINKING / CULTIVATION PATENTS: growing MACROALGAE/seaweed (or other biomass) that captures CO2 via photosynthesis, then SINKING it to the deep ocean (below ~1000m) for long-term storage — including cultivation systems (offshore/open-ocean farms, substrates/buoys), and controlled sinking/storage; biomass-sinking/cultivation methods are high-value IP (macroalgae CDR is a distinct approach — cultivation and reliable, verifiable deep-sinking are the technical challenges, and durability/permanence is debated). MRV / VERIFICATION PATENTS: THE defining, hardest challenge — MEASURING and VERIFYING how much CO2 was actually removed and DURABLY stored in the vast, dynamic ocean — combining sensors, ocean/biogeochemical MODELING, isotopic/chemical tracers, and uncertainty quantification to credibly quantify net carbon removal; MRV/verification methods are CRITICAL, high-value, distinctive IP (ocean MRV is genuinely hard — the ocean is huge, mixing, and the carbon signal is diffuse — so credible, defensible MRV is the single biggest unsolved problem and the make-or-break for selling ocean carbon credits at premium prices; rich, essential whitespace). MONITORING / SAFETY PATENTS: ENVIRONMENTAL MONITORING and ensuring ECOSYSTEM SAFETY (avoiding harmful pH swings, metal release from minerals, ecological disruption) — and supporting permitting; monitoring/safety methods are high-value IP (environmental safety and monitoring are essential for social license, permitting, and scale-up of ocean intervention). DURABILITY PATENTS: ensuring/quantifying long-term storage permanence (bicarbonate stability, deep-ocean residence); durability methods are valuable IP. Biomass sinking/cultivation, MRV/verification, monitoring/safety, and durability are the highest-value application IP because verifiable removal, credible MRV, and ecosystem-safe operation are exactly what make ocean CDR credible and saleable.

Marine carbon removal startup IP strategy must navigate the MRV-is-the-make-or-break reality (verifying carbon removal in the ocean is the single hardest problem and the basis for selling credits — MRV methods are among the most valuable, defensible IP, and credible MRV is required for revenue), the approach choice (OAE vs electrochemical/direct ocean capture vs biomass sinking — different chemistry, IP, durability, and maturity; electrochemical approaches have richer hardware IP), the economics/carbon-credit dependence (mCDR revenue depends on credit prices, credit quality/MRV, and (for electrochemical) co-product (hydrogen) value and energy cost — economics and credit markets drive viability as much as patents), the Captura/Ebb/Equatic/Planetary/Running Tide portfolios, the co-product economics (hydrogen/minerals from electrochemical mCDR materially help economics), the environmental-safety/permitting gate (ecosystem safety, monitoring, and permitting are non-IP gates that shape what's deployable — and social license matters), the durability/permanence debate (different approaches have different, sometimes-contested permanence — affects credit quality), and a landscape where alkalinity enhancement, electrochemical capture, biomass sinking, MRV, and monitoring are the durable assets; understand that the science is partly public and MRV is unsolved, so the durable IP is in alkalinity-generation/electrochemical-capture process design, co-product integration, biomass cultivation/sinking, and (above all) MRV/verification methods — with MRV credibility, process/energy efficiency, co-product economics, and permitting often the real moat, and that carbon-removal efficiency, MRV/durability credibility, environmental safety, economics, and FTO matter as much as patents; identify whitespace in MRV, electrochemical capture, and co-product integration. MARINE CARBON REMOVAL STARTUP IP STRATEGY: ALKALINITY ENHANCEMENT, ELECTROCHEMICAL/DIRECT OCEAN CAPTURE, BIOMASS SINKING, CO-PRODUCTS, AND (ABOVE ALL) MRV ARE THE IP: patent alkalinity-generation/electrochemical-capture processes, co-product integration, biomass cultivation/sinking, and MRV/verification methods; MRV IS THE MAKE-OR-BREAK + MOST VALUABLE IP: verifying carbon actually removed/stored in the vast dynamic ocean is the single hardest problem and the basis for credit revenue — credible MRV (sensors + modeling + tracers + uncertainty) is the most defensible, essential IP and richest whitespace; APPROACH CHOICE (OAE VS ELECTROCHEMICAL VS BIOMASS): different chemistry/IP/durability/maturity — electrochemical/direct-ocean-capture has the richest hardware/process IP (Captura/Equatic/Ebb); ECONOMICS + CARBON CREDITS DRIVE VIABILITY: revenue depends on credit prices, credit quality/MRV, co-product (hydrogen) value, and energy cost — economics/credit markets matter as much as patents; CO-PRODUCTS (HYDROGEN/MINERALS) HELP ECONOMICS: electrochemical mCDR co-products materially improve economics — valuable integration IP; ENVIRONMENTAL SAFETY/PERMITTING IS A NON-IP GATE: ecosystem safety, monitoring, and permitting (plus social license) shape what's deployable — plan around them; DURABILITY/PERMANENCE AFFECTS CREDIT QUALITY: approaches differ in (sometimes-contested) permanence — durability evidence drives credit value; SCIENCE IS PARTLY PUBLIC — NOVELTY IN PROCESS/MRV: the underlying ocean chemistry is public — IP is in process/electrochemical design, co-products, and MRV; EFFICIENCY/MRV/SAFETY/ECONOMICS/FTO MATTER AS MUCH AS PATENTS: carbon-removal efficiency, MRV/durability credibility, environmental safety, economics, and FTO drive value; WHEN TO PATENT (OR KEEP SECRET): NOVEL CAPTURE/ALKALINITY/MRV/CO-PRODUCT METHOD WITH MEASURED PERFORMANCE: file (or trade-secret MRV models) once a method shows measured results (CO2 removed per energy/cost + alkalinity/capture efficiency + co-product yield + verified net removal/durability (MRV) + environmental safety) — measured removal efficiency, verified net removal (MRV), and co-product/energy economics are the critical mCDR IP metrics; KEY FTO CHECKLIST: Captura/Ebb Carbon/Equatic/Planetary/Running Tide; ocean alkalinity enhancement (mineral/electrochemical alkalinity, bicarbonate storage, dosing/dispersal); electrochemical/direct ocean capture (electrodialysis/acid-base seawater CO2 extraction); co-products (hydrogen/mineral carbonates); biomass sinking/cultivation (macroalgae farming + deep-ocean sinking, blue carbon); MRV/verification (sensors/biogeochemical modeling/tracers/uncertainty — the make-or-break); monitoring/safety (pH/metal/ecosystem, permitting); durability/permanence; carbon-credit market/economics dependence.