Patents
US 12643979 B2: Non-isocyanate polyurethanes from bio-based polyols
- Granted
- 2026-06-02
- Filed
- 2021-06-03 application 18007992
- Type
- Utility · 4 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
Bio-based polymer precursors and non-isocyanate polyurethanes (NIPU) and non-isocyanate polyurethane foams (NIPUF) that can be formed from the precursors, as well as methods for the synthesis of the precursors and the polyurethane products are described. The bio-based polymer precursors are formed through functionalization of a bio-based polyol, e.g., lignin, with cyclic carbonates. The bio-based polyol starting materials need not be pre-processed and can include Kraft lignin. NIPU/NIPUF can be synthesized through a ring opening curing reaction of cyclic carbonates of the bio-based polyol precursor with diamines. The carbonates and diamines can include non-toxic bio-based carbonates.
Source: PTBLXML, file of 2026-06-02 (ipgb20260602.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| CLEMSON UNIVERSITY RESEARCH FOUNDATION 125 patents | US company or organization | Clemson, SC | CLEMSON UNIVERSITY RESEARCH FOUNDATION Nonprofit EXACT high confidence: identical full name and state | PTBLXML, file of 2026-06-02 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| Srikanth Pilla | Clemson, SC | PTBLXML, file of 2026-06-02 | ||
| James Scott Sternberg | Clemson, SC | PTBLXML, file of 2026-06-02 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| C08G | Macromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds | C08G71/04 | PTBLXML, file of 2026-06-02 |
Cooperative Patent Classification, as currently assigned (one row per subclass).
Assignments and security interests
| Recorded | What | From | To | Reel/frame | Source |
|---|---|---|---|---|---|
| 2022-12-19 | Assignment Assignment of assignor's interest | CLEMSON UNIVERSITY signed 2022-11-29 | CLEMSON UNIVERSITY RESEARCH FOUNDATION CLEMSON, SC | 62145/50 | PASDL, file of 2026-10-15 |
| 2022-12-02 | Assignment Assignment of assignor's interest | PILLA, SRIKANTH signed 2021-05-18 STERNBERG, JAMES SCOTT signed 2021-05-20 | CLEMSON UNIVERSITY CLEMSON, SC | 61958/887 | PASDL, file of 2026-10-15 |
Documents recorded with the USPTO Assignment Recordation Branch that list this patent. A security interest is a lender’s claim on the patent as collateral; a release ends it.
USPTO bulk data: PatentsView granted patents, disambiguated (PVGPATDIS) for patents, assignees, inventors, places and CPC categories; the USPTO Patent Assignment Dataset (ECORSEXC) for assignments and security interests. Patents filed in the last 20 years. No claims or full text. Links to other records are by name (and state): EXACT means the identical full name and state; FUZZY means a looser name match, with the confidence shown.