Ocean Carbon Removal Patents

Ocean (marine) carbon dioxide removal (mCDR) patents cover ocean-alkalinity-enhancement innovations; direct-ocean-capture innovations; electrolytic and electrochemical innovations; and biomass-sinking and MRV innovations — with IP held by electrochemical-mCDR startups (in a young field leveraging the ocean — the planet's largest carbon sink — to remove CO2). MAJOR OCEAN-CARBON-REMOVAL PATENT HOLDERS: CAPTURA (Caltech-spun): DIRECT OCEAN CAPTURE — using electrodialysis to extract dissolved CO2 from seawater (the seawater, depleted of CO2, then re-absorbs atmospheric CO2 when returned), producing a concentrated CO2 stream for storage/use without chemicals. EQUATIC (UCLA): an electrolytic process that runs seawater through electrolysis to lock CO2 into solid carbonate minerals AND produces green hydrogen as a co-product (improving economics) — combining mineralization and alkalinity. EBB CARBON: OCEAN ALKALINITY ENHANCEMENT via electrochemical ACID/BASE SPLITTING — splitting seawater into an acid and a base stream, returning the base (alkalinity) to the ocean so it takes up more atmospheric CO2 (and neutralizing/storing the acid). OTHERS: Planetary Technologies (adding mineral alkalinity/'antacid' to the ocean), Vesta (coastal/beach olivine spreading — accelerated weathering in the marine environment), Running Tide (kelp/biomass sinking — wound down), Brilliant Planet (algae ponds), and academic researchers. Ocean alkalinity enhancement (electrochemical and mineral), direct ocean capture, and electrolytic mineralization are the core mCDR patent domains — and electrochemical approaches plus rigorous MRV are the most novel, defensible IP.

Electrochemical-alkalinity innovations; acid/base-splitting innovations; direct-ocean-capture (extraction) innovations; and electrolytic-mineralization innovations represent core mCDR patent domains — and the electrochemical processes (efficiently shifting ocean chemistry or extracting CO2) are the technical heart and the most novel IP. OCEAN-ALKALINITY-ENHANCEMENT (OAE) PATENTS: electrochemical generation of alkalinity (base) from seawater via membrane electrolysis / bipolar-membrane electrodialysis (splitting seawater into acid and base — Ebb Carbon), returning alkalinity to increase the ocean's CO2 uptake (and managing the co-produced acid — neutralizing with rock or storing); plus mineral OAE (dissolving alkaline minerals — Planetary). The electrochemical cell, membrane design, energy efficiency, and acid-management are key claims. DIRECT-OCEAN-CAPTURE PATENTS: extracting CO2 (or bicarbonate) directly from seawater — electrodialysis/pH-swing to acidify a seawater stream and outgas/strip the concentrated CO2 (Captura), then returning CO2-depleted seawater to re-absorb atmospheric CO2; the extraction cell, pH-swing chemistry, CO2 stripping/recovery, and energy minimization are core IP (seawater holds ~150× more CO2 per volume than air, so extracting from seawater can be more efficient than direct AIR capture). ELECTROLYTIC-MINERALIZATION PATENTS: electrolysis that precipitates CO2 as solid carbonate while co-producing hydrogen (Equatic) — electrode/cell design, mineral precipitation control, and hydrogen co-product integration. Efficient electrochemical alkalinity/extraction cells and electrolytic mineralization (with valuable co-products like H2) are the highest-value mCDR IP.

Ocean-carbon-MRV innovations; air-sea-flux and modeling innovations; environmental-monitoring innovations; and durability and additionality innovations represent the central, highest-value mCDR patent domain — because verifying carbon removal in the vast, variable, hard-to-measure ocean is the field's hardest problem and the gating issue for credit credibility. THE OCEAN MRV CHALLENGE: unlike a point-source capture, ocean CDR works by shifting seawater chemistry so the ocean takes up MORE atmospheric CO2 over weeks-to-months across a huge, mixing, naturally-variable system — so directly measuring the resulting atmospheric removal is extremely hard; you must quantify the alkalinity/CO2 change, model the subsequent air-sea CO2 flux, and prove it against natural background — the dominant uncertainty in mCDR. MRV / QUANTIFICATION PATENTS: methods to measure and verify removal — seawater carbonate-chemistry sensors (pH, alkalinity, dissolved inorganic carbon, pCO2), tracer and dye studies, and especially OCEAN BIOGEOCHEMICAL MODELING of the air-sea CO2 re-equilibration (how much atmospheric CO2 the chemistry shift actually draws down, and how durably), calibrated to field data; these measurement/modeling methods (tied to specific sensors/measurements) are the most defensible MRV IP (and §101-tied), often combined with trade-secret models. ENVIRONMENTAL-MONITORING PATENTS: monitoring ecological effects (pH/alkalinity changes affect marine life), safe-operating-limits, and impact assessment (environmental safety is both a permitting requirement and a patentable methodology). DURABILITY / ADDITIONALITY PATENTS: quantifying permanence (ocean-stored carbon durability) and additionality, and registry/methodology integration (Isometric, Frontier, Puro). Rigorous ocean-carbon MRV (carbonate-chemistry sensing + air-sea-flux modeling) is the highest-strategic-value mCDR IP because, without verified removal, there is no sellable credit — and it is the field's defining technical and credibility challenge.

Ocean carbon removal startup IP strategy operates in a young, science-heavy field — but must navigate Captura/Equatic/Ebb electrochemical patents, electrochemistry/electrodialysis and chlor-alkali prior art (seawater electrolysis is mature industrial chemistry), ocean-chemistry/OAE academic prior art, §101 limits on MRV modeling, marine permitting and environmental scrutiny (altering ocean chemistry raises regulatory and ecological concerns — a major non-IP gate), carbon-credit methodologies/registries, and a landscape where MRV credibility, energy efficiency, environmental safety, and cost decide success; understand that seawater electrolysis is partly prior art, so the durable IP is in efficient electrochemical cells/membranes for alkalinity or extraction, co-product integration (H2), rigorous ocean MRV (tied to measurements/models), and environmental-safety methods, and that MRV credibility and permitting matter as much as patents; identify whitespace in electrochemical efficiency, direct ocean capture, MRV/modeling, and co-product economics. OCEAN-CARBON-REMOVAL STARTUP IP STRATEGY: SEAWATER ELECTROLYSIS IS PARTLY PRIOR ART — EFFICIENT CELLS, MRV, AND ENVIRONMENTAL METHODS ARE THE IP: chlor-alkali/electrodialysis is mature, so patent the specific efficient electrochemical cell/membrane for alkalinity or CO2 extraction, co-product (H2) integration, rigorous ocean MRV (tied to sensors/models), and environmental-safety methods; MRV/QUANTIFICATION IS THE HIGHEST-STRATEGIC-VALUE WHITESPACE: verifying removal in the variable ocean (carbonate-chemistry sensing + air-sea-flux modeling) is the hardest problem and the gating issue for credits — the most valuable, defensible IP, combined with trade-secret models; ELECTROCHEMICAL EFFICIENCY AND CO-PRODUCT ECONOMICS ARE COMMERCIAL LEVERS: lower-energy alkalinity/extraction and valuable co-products (green hydrogen — Equatic) make mCDR affordable — patentable; DIRECT OCEAN CAPTURE LEVERAGES SEAWATER'S CONCENTRATION ADVANTAGE: seawater holds ~150× more CO2 per volume than air, so direct ocean capture (Captura) can beat direct AIR capture on energy — a strategic, patentable angle; ENVIRONMENTAL SAFETY IS PATENTABLE AND A PERMITTING GATE: methods ensuring safe ocean-chemistry changes (within ecological limits) are both required and IP; MRV CREDIBILITY, PERMITTING, AND OCEAN ACCESS ARE PARALLEL MOATS: registry approval, marine permits, and environmental social license gate the business; WHEN TO PATENT: NOVEL PROCESS/MRV WITH MEASURED PERFORMANCE: file once a system shows measured results (CO2 removed per energy + electrochemical efficiency + co-product yield + MRV uncertainty/verifiability + environmental safety + cost $/tCO2) vs. direct-air-capture or baseline mCDR — measured energy efficiency, net CO2 removal, MRV verifiability, and cost are the critical mCDR IP metrics; KEY FTO CHECKLIST: Captura direct ocean capture electrodialysis/pH-swing CO2 extraction; Equatic electrolytic seawater CO2 mineralization + green-H2 co-product (UCLA); Ebb Carbon ocean alkalinity enhancement bipolar-membrane acid/base splitting; Planetary mineral alkalinity; Vesta coastal olivine; chlor-alkali/electrodialysis prior art; bipolar/ion-exchange membrane cell efficiency; acid-management neutralization/storage; carbonate-chemistry sensor (pH/alkalinity/DIC/pCO2) + air-sea-flux biogeochemical model MRV (§101-tied/trade-secret); environmental-safety monitoring; Isometric/Frontier methodology.