Heirloom Carbon Technologies, Inc.

Clean tech · Private

Direct air capture system using enhanced weathering and mineral carbonation to remove CO2 from atmosphere

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Updated Oct 23, 2026

Sector: Clean tech
Total capital: $256K

Federal grants: $256K; 1 award · 2021; Rank in peer group#23 of 59
Private capital raised: None on recordNo Form D filings on SEC EDGAR. Some raises are not filed.
Federal contracts: None on recordNo federal contract awards found.
Granted patents: 0; 16 pending

Capital timeline

Latest events

Jun 2021Federal grantNSF · Phase I · SBIR Phase I: A transformative low-cost approach for Direct Air Capture of CO2 via repeated cycles of ambient weathering of metal oxides$256K

Node area is scaled to amount. Form D reports securities sold, which can differ from an announced round; filings are numbered in the order they were made.

Standing among 59 peers

Line = median

Clean tech · System

Federal grants#23 · top 39%

Cumulative measures favor older companies. Rankings describe position today, not outcome. Below the median, ranks show as a band rather than a number.

Founders and team

No founders are linked to this company yet.

Founders appear once a person is matched to the company through its own patents, grants or filings. We never infer people from social profiles.

Checked: USPTO inventors; federal award principal investigators; SEC Form D related persons · Oct 23, 2026

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What it has protected

USPTO · 0 granted of 16

Jan 16, 2025PendingSystems And Methods For Thermal Storage Integration Into High Temperature Decomposition ReactorUSPTOApplication 18771456
Oct 10, 2024PendingTray Processing Units For Carbon Capture And Removal Systems, And Methods Of Operating The SameUSPTOApplication 18626398
Feb 29, 2024PendingControls Architecture For Predicting And Maintaining CO2 Uptake Rates In Direct Air Capture Contactors, And Methods Of Operating The SameUSPTOApplication 18239201

Show all 16 patent records

Systems And Methods For Thermal Storage Integration Into High Temperature Decomposition ReactorJan 16, 2025 · Application 18771456Pending
Tray Processing Units For Carbon Capture And Removal Systems, And Methods Of Operating The SameOct 10, 2024 · Application 18626398Pending
Controls Architecture For Predicting And Maintaining CO2 Uptake Rates In Direct Air Capture Contactors, And Methods Of Operating The SameFeb 29, 2024 · Application 18239201Pending
Direct Air Capture Contactor For Carbon Uptake, And Methods Of Operating The SameJan 11, 2024 · Application 18348112Pending
Systems And Methods Of Carbon Capture From Cement Production ProcessJun 22, 2023 · Application 18067896Pending
Direct Air Capture Contactor For Carbon Uptake, And Methods Of Operating The SameApplication PCTUS2023069701Pending
Central Tray Processing Units For Carbon Capture And Removal Systems, And Methods Of Operating The SameApplication 63494285Pending
Systems And Methods Of Carbon Capture From Cement Production ProcessApplication PCTUS2022081941Pending
Controls Architecture For Predicting And Maintaining CO2 Uptake Rates In Direct Air Capture Contactors, And Methods Of Operating The SameApplication 63402211Pending
Direct Air Capture Contactor For Carbon Uptake, And Methods Of Operating The SameApplication 63358602Pending
Process And Methods For Operating A Direct Air Carbon Capture System Intermittently Based On Energy AvailabilityApplication PCTUS2025053400Pending
Systems And Methods Of Carbon Capture From Cement Production ProcessApplication 63291741Pending
Process And Methods For Operating A Direct Air Carbon Capture System Intermittently Based On Energy AvailabilityApplication 63714035Pending
Tray Processing Units For Carbon Capture And Removal Systems, And Methods Of Operating The SameApplication PCTUS2024023029Pending
Controls Architecture For Predicting And Maintaining CO2 Uptake Rates In Direct Air Capture Contactors, And Methods Of Operating The SameApplication PCTUS2023073092Pending
Systems And Methods For Thermal Storage Integration Into High-temperature Decomposition ReactorApplication 63513706Pending

SUGANIT SYSTEMS. INC.Similar federal contract value in Clean tech · null in contracts
Summit Carbon Holdings, LLCSimilar federal contract value in Clean tech · null in contracts
APPLIED RESEARCH TEAM, INC.Similar federal contract value in Clean tech · null in contracts
Global FIA, Inc.Similar federal contract value in Clean tech · null in contracts
Coastal Measures Inc.Similar federal contract value in Clean tech · null in contracts
DeepWater Desal, LLCSimilar federal contract value in Clean tech · null in contracts

Regulatory activity · Clean tech

Sector-level, not company-level

09 Jul 2026Air Plan Approval; Michigan; Redesignation and Maintenance Plan for the Partial St. Clair 2010 1-Hour Sulfur Dioxide (SO2) NAAQS Nonattainment AreaEnvironmental Protection Agency
02 Jul 2026Air Plan Approval; Delaware; 2006 24-Hour Fine Particulate Matter Limited Maintenance Plan for the Philadelphia Nonattainment AreaEnvironmental Protection Agency
02 Jul 2026Air Plan Approval; Oklahoma; Updates to the State Implementation Plan for New Source Review Permitting and General SIP ProvisionsEnvironmental Protection Agency
30 Jun 2026Epyrifenacil; Pesticide TolerancesEnvironmental Protection Agency
30 Jun 2026Fluoxapiprolin; Pesticide TolerancesEnvironmental Protection Agency
30 Jun 2026Chlormequat Chloride; Pesticide TolerancesEnvironmental Protection Agency

Rules are matched to sector, not to company. Recent activity in a sector is context rather than a signal about this business — until rules are matched to what a company actually builds, the section is shown as context and nothing more.

Sources

Federal grants from SBIR/STTR, NIH, NSF and DoD records. Federal contracts from USAspending.gov. Private capital from SEC Form D. Patents from USPTO. Publications from OpenAlex. Regulatory activity from the Federal Register. Press matched on company name.

How to read this page

Figures show associations in public records, not causes or predictions. Nothing here is investment advice. An em-dash means no record was found under this company's name, not that none exists.

Data freshness

SEC Form D filings through Oct 23, 2026. SBIR and STTR awards through Oct 21, 2026.