Carbon Nanotube Patents

Carbon nanotube CNT patents cover SWCNT single-wall and MWCNT multi-wall synthesis; CNT purification and sorting for semiconductor-enriched fractions; CNT composite materials for structural and electrical applications; CNT transistor and logic circuit innovations; CNT electrode innovations for energy storage; and CNT membrane innovations for filtration — with IP held by early CNT commercialization companies, semiconductor startups, and composites companies: MAJOR CARBON NANOTUBE PATENT HOLDERS: HYPERION CATALYSIS: 500+; specific MWCNT composite (specific specific VGCF vapor grown carbon fiber CNT: specific specific CCVD catalytic chemical vapor deposition from specific specific Fe:Co/MgO catalyst from specific specific methane CH₄ 900°C from specific specific 10-100 nm outer diameter MWCNT from specific specific 4-10 graphite wall layers from specific specific entangled network from specific specific 95%+ purity at specific specific 1-5 wt% in specific specific nylon 6 PBT PP PP/PE for specific specific 10^4 Ω/sq ESD antistatic from specific specific automotive fuel line fuel cap from specific specific HyperionTM CNT masterbatch from specific specific injection molding extrusion); NANTERO: 200+; specific CNT memory (specific specific NRAM nanotube RAM: specific specific SWCNT network film from specific specific >98% semiconducting from specific specific aligned gel-phase from specific specific 1T1R cross-point array from specific specific CNT field-effect NVM nonvolatile memory from specific specific 0.1 V threshold from specific specific <1 ns switching from specific specific -269°C to >300°C operating range from specific specific rad-hard >5 Mrad(Si) from specific specific >10^15 endurance cycles from specific specific space+military+automotive); CARBON SOLUTIONS / OCSiAl: 200+; specific SWCNT (specific specific Tuball SWCNT: specific specific 1.8 nm average diameter from specific specific >75% purity SWCNT from specific specific 1 wt% Tuball in specific specific Li-ion anode silicon from specific specific 60% silicon expansion buffering from specific specific ×5 cycle lifetime vs. specific specific carbon black 2 wt% from specific specific conductive network at specific specific 0.01 wt% percolation threshold from specific specific 100,000× lower than specific specific carbon black for specific specific battery electrode); SAMSUNG SAIT; IBM; STANFORD; MIT; FUJITSU: combined major CNT semiconductor+composite IP holders.

CNT transistor innovations for post-silicon semiconductor logic; CNT high-strength fiber innovations for structural composites; and CNT electrode innovations for supercapacitors and lithium batteries represent three core CNT patent domains: CNT TRANSISTOR PATENTS: IBM; STANFORD; MIT SHULAKER GROUP; NANTERO; CARBONICS: specific CNT transistor (specific specific aligned SWCNT transistor: specific specific aligned SWCNT array from specific specific 99.99% semiconducting density at specific specific 125 SWCNT/μm from specific specific surface chemistry HF acid preferential metallic tube removal from specific specific Al₂O₃ ALD gate dielectric 4 nm from specific specific 100 nm gate contact length from specific specific sub-1 V operation at specific specific ION/IOFF >10^6 at specific specific Vth 0.3 V from specific specific <0.5 mA/μm ION at specific specific 0.8 V VDD from specific specific µ FET mobility 500-1,000 cm²/V·s vs. specific specific Si 500 cm²/V·s for specific specific ring oscillator 1 GHz; specific specific CNFET carbon nanotube FET: specific specific Stanford CNFET sub-5 nm node from specific specific 0.8 nm SWCNT diameter from specific specific 2× smaller than specific specific Si GAAFET at specific specific same effective gate length from specific specific MIT 3D monolithic heterogeneous integration from specific specific CNFET above CMOS Si from specific specific multi-layer CNFET logic from specific specific 2016-layer 3D RV16X-NANO chip from specific specific all-carbon arithmetic-logic unit ALU from specific specific 16-bit RISC-V ISA); CNT FIBER PATENTS: TEIJIN ARAMID; NANOCOMP; TORAY; UT AUSTIN; CAMBRIDGE UNIVERSITY: specific CNT fiber (specific specific dry-spun CNT fiber: specific specific forest CVD grown 10 mm height from specific specific 100 μm twist-spun fiber from specific specific cross-linking DMSO+UV from specific specific 0.8 GPa tensile strength from specific specific 7.5 GPa modulus from specific specific 0.36 g/cm³ density from specific specific 260 GPa/SG specific tensile strength vs. specific specific carbon fiber PAN 200 GPa/SG from specific specific 760 S/m electrical from specific specific ballistic V50 750 m/s vs. specific specific Kevlar 29 at specific specific same areal density for specific specific lightweight body armor multifunctional structural; specific specific CNT aluminum nanocomposite: specific specific SPS spark plasma sintering at specific specific 450°C 50 MPa from specific specific 1 wt% SWCNT+Al from specific specific UTS 520 MPa vs. specific specific Al 6061-T6 310 MPa at specific specific 40% lighter than specific specific Ti for specific specific aerospace airframe); CNT ENERGY STORAGE PATENTS: NAWA TECHNOLOGIES; MAXWELL (TESLA); CARBON SOLUTIONS; SKELETON TECHNOLOGIES; MIT: specific CNT energy storage (specific specific CNT supercapacitor: specific specific SWCNT electrode from specific specific vertical aligned VACNT forest 1 mm height from specific specific 1,300 m²/g BET surface area from specific specific EMIMBF₄ ionic liquid electrolyte from specific specific 60°C ionic liquid window from specific specific 180 F/g specific capacitance vs. specific specific activated carbon 100-130 F/g from specific specific 10,000 W/kg power density vs. specific specific 1,000 W/kg activated carbon for specific specific pulse power EV+grid fast-ramp from specific specific 1M+ cycle lifetime; specific specific CNT Li battery anode: specific specific SWCNT binder-free anode from specific specific 0.01 wt% CNT network from specific specific 372 mAh/g graphite+110% Si expansion buffering from specific specific 3.4 mAh/cm² loading from specific specific 0.2C→1C 95% capacity retention vs. specific specific PVDF binder+carbon black for specific specific fast-charge energy density).

CNT synthesis innovations for selective chirality or wall number control; CNT purification and semiconducting sorting innovations for electronic-grade CNTs; and CNT membrane filtration innovations for water treatment and gas separation represent three additional CNT patent domains: CNT SYNTHESIS PATENTS: NANOCOMP; OCSiAL; CARBON SOLUTIONS; UNIDYM; BUCKY TECH; RICE UNIVERSITY (SMALLEY GROUP): specific CNT synthesis (specific specific floating catalyst CVD: specific specific FeCl₂ catalyst from specific specific methane CH₄ or specific specific ethylene C₂H₄ at specific specific 1,100-1,200°C from specific specific horizontal tube reactor from specific specific argon carrier from specific specific 10-50 g/h SWCNT yield from specific specific 0.8-1.2 nm diameter from specific specific (6,5) or specific specific (7,5) semiconductor chirality enriched from specific specific HiPco high-pressure CO CO-disproportionation at specific specific 10 atm CO at specific specific 1,050°C from specific specific Rice University patent from specific specific <0.2 nm diameter distribution from specific specific >90% SWCNT purity; specific specific chirality selective growth: specific specific CoMoCAT bimetallic Co+Mo at specific specific SiO₂ support from specific specific CO at specific specific 750°C from specific specific (6,5) SWCNT 42% chirality enrichment from specific specific 1.5-2× electronic grade vs. specific specific mixed for specific specific transistor application at specific specific 600 SWCNT/μm density); CNT PURIFICATION PATENTS: SAMSUNG; TSMC; NEC; UNIDYM; NANTERO: specific purification (specific specific density gradient ultracentrifugation DGU: specific specific SDS+SC surfactant wrap from specific specific CsCl gradient 1.2-1.4 g/mL from specific specific 250,000×g centrifugation at specific specific 5°C from specific specific 1 mm fraction collection from specific specific 98%+ semiconductor SWCNT at specific specific 1 nm diameter from specific specific optical absorption 1st 2nd exciton peak sorting from specific specific 10 mg/h throughput vs. specific specific >98% semiconducting for specific specific transistor array; specific specific gel chromatography: specific specific agarose gel column from specific specific SDS SDBS surfactant selective adsorption from specific specific semiconductor adsorption at specific specific metal pass-through for specific specific >99% semiconductor purity from specific specific 50 mg/h throughput from specific specific multi-column separation at specific specific 5 column stages); CNT MEMBRANE PATENTS: PORIFERA; MIT; CARBON SOLUTIONS; LOCKHEED MARTIN; SANDIA: specific CNT membrane (specific specific VA-CNT membrane: specific specific vertically aligned MWCNT forest from specific specific CCVD 1 mm height from specific specific PS polystyrene filler infiltration from specific specific microtome slice 2-5 μm membrane from specific specific water flux >10 Lmh at specific specific 1 bar vs. specific specific commercial NF membrane 0.5 Lmh from specific specific 10^7 fold enhancement vs. specific specific MD simulation smooth CNT wall for specific specific ion exclusion Na⁺ 90%+ > 7 Å pore from specific specific functionalized end cap from specific specific -COOH+selectivity group for specific specific water desalination+ion exchange).

CNT startup IP strategy must recognize the broad foundational IP held by early CNT pioneers (Hyperion, Nantero, IBM, Stanford) that covers synthesis, composites, and electronic applications; identify technical differentiation in chirality-selective synthesis, electronic-grade purification, or specific application performance metrics; and appreciate that trade secret protection for synthesis catalyst formulations and reactor designs complements patent protection for applications: CARBON NANOTUBE STARTUP IP STRATEGY: UNDERSTAND THE CNT IP LANDSCAPE: HYPERION CATALYSIS HOLDS FOUNDATIONAL MWCNT COMPOSITE IP: Hyperion Catalysis (500+) pioneered MWCNT-in-thermoplastic composite IP and holds broad VGCF/CNT conductive composite claims — any startup in CNT-reinforced polymers or CNT antistatic composites should carefully review Hyperion&apos;s portfolio; NANTERO HOLDS CNT MEMORY IP: Nantero (200+) holds the foundational NRAM CNT memory IP — CNT-based nonvolatile memory for space/mil applications must navigate Nantero&apos;s portfolio carefully; IBM AND STANFORD HOLD CNT TRANSISTOR IP: IBM has very broad CNT transistor and nanotube logic circuit claims; Stanford holds aligned SWCNT transistor IP from the Dai and Wong groups — any CNT semiconductor startup must conduct detailed FTO against IBM and Stanford CNT transistor IP; OCSIAL HOLDS COMMERCIAL SWCNT PRODUCTION IP: OCSiAl is the world&apos;s largest SWCNT producer (Tuball line) and holds production process IP — startups in SWCNT battery applications should review OCSiAl/Carbon Solutions IP for synthesis and battery application claims; CNT SYNTHESIS IP: CATALYST FORMULATION IS KEY TRADE SECRET: The specific catalyst composition (precursor, support, promoter), reactor geometry, carrier gas composition, and temperature profile that produces chirality-enriched CNTs at commercially useful purity and yield is the core trade secret moat — this is very difficult to reverse-engineer from the product (unlike a polymer composition) and should be protected as trade secret in combination with patent claims covering the product characteristics; WHEN TO PATENT IN CNT MATERIALS: NOVEL CNT COMPOSITE WITH MEASURED PROPERTY IMPROVEMENT AT VALIDATED LOADING: specific novel CNT composite (specific specific CNT type+loading+dispersion method+matrix material) with specific measured property improvement (specific specific UTS MPa improvement at specific specific wt% loading, specific specific electrical conductivity S/m at specific specific percolation threshold wt%, specific specific fracture toughness KIC improvement at specific specific CNT loading) vs. specific specific carbon black, specific specific conventional carbon fiber, or specific specific graphene baseline at specific specific same loading in same matrix — property improvement data at specific weight % in specific matrix at industry-standard test methods (ASTM D638 tensile, ASTM D4496 electrical) is essential for CNT composite IP claims; NOVEL CNT TRANSISTOR WITH MEASURED ION/IOFF AND MOBILITY: specific novel CNT transistor design (specific specific CNT type+density+gate architecture+dielectric) with specific measured FET performance (specific specific ION/IOFF >10^6, specific specific VDD V, specific specific ION mA/μm at specific specific VDD, specific specific FET mobility cm²/V·s, specific specific Vth V) vs. specific specific Si MOSFETs at equivalent gate length+VDD — FET performance data at equivalent technology node conditions is essential to support CNT transistor IP claims and distinguish from Si CMOS prior art; NOVEL CNT ENERGY STORAGE WITH MEASURED SPECIFIC CAPACITANCE/CAPACITY AND CYCLE LIFE: specific novel CNT electrode (specific specific CNT type+structure+surface area+electrolyte) with specific measured energy storage metrics (specific specific specific capacitance F/g, specific specific specific energy Wh/kg, specific specific power density W/kg, specific specific cycle retention % after X cycles at specific specific C-rate) vs. specific specific activated carbon or specific specific graphite/Si anode baseline at specific specific same electrolyte and C-rate — energy storage performance data vs. commercial electrode baseline at standardized test conditions (ASTM B331 for capacitors) supports CNT electrode IP claims; KEY FTO CHECKLIST: Hyperion Catalysis VGCF CCVD Fe:Co/MgO CH₄ 900°C 10-100 nm MWCNT nylon PBT PP 1-5 wt% 10^4 Ω/sq ESD automotive fuel system; Nantero NRAM SWCNT >98% semiconducting 0.1 V threshold <1 ns -269→>300°C rad-hard >10^15 cycles NVM; OCSiAl Tuball 1.8 nm >75% SWCNT 0.01 wt% percolation 1 wt% Si anode 60% expansion buffering ×5 cycle life; IBM CNT FET transistor aligned array 99.99% semiconducting ION/IOFF >10^6 sub-1V; Stanford CNFET sub-5 nm 0.8 nm SWCNT 2× smaller Si GAAFET MIT RV16X-NANO 3D RISC-V; dry-spun fiber 0.8 GPa 7.5 GPa modulus 0.36 g/cm³ 260 GPa/SG body armor; SWCNT supercapacitor 1,300 m²/g EMIMBF₄ 180 F/g 10,000 W/kg 1M+ cycles; VA-CNT membrane PS filler 10 Lmh 10^7 enhancement Na⁺ 90%+ COOH end-cap.