Patents
US 9683313 B2: Method of making carbon fibers from lignin
- Granted
- 2017-06-20
- Filed
- 2013-08-20 application 14429828
- Type
- Utility · 19 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
A method of making a carbon fiber includes heat treating a lignin precursor absent an active ingredient in an inert atmosphere to raise the glass transition temperature (Tg) of the precursor by at least five (5%) percent, forming a lignin precursor having an increased Tg (High Tg Lignin). The High Tg Lignin can be spun into a fiber. The fiber may then be stabilized to form a thermoset fiber. The time period for stabilizing the fiber is less than one hundred (100) hours.
Source: PVGPATDIS, file of 2026-04-10 (ipg170620.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| GrafTech International Holdings Inc. 65 patents | US company or organization | Parma, OH | PVGPATDIS, file of 2026-04-10 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| Ching-Feng Chang | Strongsville, OH | 13 | PVGPATDIS, file of 2026-04-10 | |
| Bassam Alnasleh | Parma Heights, OH | 4 | PVGPATDIS, file of 2026-04-10 | |
| Omer Gul | Olmsted Falls, OH | 9 | PVGPATDIS, file of 2026-04-10 | |
| Robert E. Miller | Vicksburg, MS | 5 | PVGPATDIS, file of 2026-04-10 | |
| Andrew Adam Hausner | Parma Heights, OH | 3 | PVGPATDIS, file of 2026-04-10 | |
| Orest L. Adrianowycz | Broadview Heights, OH | 3 | PVGPATDIS, file of 2026-04-10 | |
| Chong Chen | Broadview Heights, OH | 14 | PVGPATDIS, file of 2026-04-10 | |
| Brian Paul Askey | Parma Heights, OH | 1 | PVGPATDIS, file of 2026-04-10 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| D01F | Chemical features in the manufacture of artificial filaments, threads, fibres, bristles or ribbons; apparatus specially adapted for the manufacture of carbon filaments | D01F9/17 | PVGPATDIS, file of 2026-04-10 |
| C07G | Compounds of unknown constitution | C07G1/00 | PVGPATDIS, file of 2026-04-10 |
| D01D | Mechanical methods or apparatus in the manufacture of artificial filaments, threads, fibres, bristles or ribbons | D01D5/06 | PVGPATDIS, file of 2026-04-10 |
Cooperative Patent Classification, as currently assigned (one row per subclass).
Assignments and security interests
| Recorded | What | From | To | Reel/frame | Source |
|---|---|---|---|---|---|
| 2024-12-23 | Security interest Security interest Security interest | GRAFTECH INTERNATIONAL HOLDINGS INC. signed 2024-12-23 | U.S. BANKS TRUST COMPANY, NATIONAL ASSOCIATION EDISON, NJ | 72905/832 | ECORSEXC, file of 2026-09-25 |
| 2024-12-23 | Security interest Security interest Security interest | GRAFTECH INTERNATIONAL HOLDINGS INC. signed 2024-12-23 | U.S. BANKS TRUST COMPANY, NATIONAL ASSOCIATION EDISON, NJ | 72905/497 | ECORSEXC, file of 2026-09-25 |
| 2024-12-23 | Release of security interest Termination and release of patent security agreement (reel 054724 frame 0588 and 063798 frame 0928) | U.S. BANK TRUST COMPANY signed 2024-12-23 | GRAFTECH INTERNATIONAL HOLDINGS INC. BROOKLYN HEIGHTS, OH | 69762/518 | ECORSEXC, file of 2026-09-25 |
| 2024-12-23 | Release of security interest Termination and release of patent security agreement (reel 064075 frame 0455) | U.S. BANK TRUST COMPANY signed 2024-12-23 | GRAFTECH INTERNATIONAL HOLDINGS INC. BROOKLYN HEIGHTS, OH | 69762/491 | ECORSEXC, file of 2026-09-25 |
| 2024-12-23 | Security interest Security interest Security interest | GRAFTECH INTERNATIONAL HOLDINGS INC. signed 2024-12-23 | GLAS AMERICAS LLC JERSEY CITY, NJ | 69666/444 | ECORSEXC, file of 2026-09-25 |
| 2023-06-27 | Security interest Security interest Security interest | GRAFTECH INTERNATIONAL HOLDINGS INC. signed 2023-06-26 | U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, AS COLLATERAL AGENT CLEVELAND, OH | 64075/455 | ECORSEXC, file of 2026-09-25 |
| 2020-12-22 | Security interest Security interest Security interest | GRAFTECH INTERNATIONAL HOLDINGS INC. signed 2020-12-22 | U.S. BANK NATIONAL ASSOCIATION, AS AGENT CLEVELAND, OH | 54724/588 | ECORSEXC, file of 2026-09-25 |
| 2018-02-12 | Security interest Security interest Security interest | GRAFTECH INTERNATIONAL HOLDINGS INC. signed 2018-02-12 | JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT BROOKLYN, NY | 45308/591 | ECORSEXC, file of 2026-09-25 |
| 2018-02-12 | Release of security interest Release of security interest | JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT signed 2018-02-12 | GRAFTECH INTERNATIONAL HOLDINGS INC. BROOKLYN HEIGHTS, OH | 45308/567 | ECORSEXC, file of 2026-09-25 |
| 2017-04-04 | Assignment Assignment of assignor's interest | ADRIANOWYCZ, OREST L signed 2014-11-25 CHANG, CHING-FENG signed 2014-11-25 HAUSNER, ANDREW signed 2014-11-25 CHEN, CHONG signed 2014-12-02 ASKEY, BRIAN PAUL signed 2015-06-23 ALNASLEH, BASSAM signed 2015-07-30 GUL, OMER signed 2015-08-03 MILLER, ROBERT E signed 2015-08-11 | GRAFTECH INTERNATIONAL HOLDINGS, INC. PARMA, OH | 41849/478 | ECORSEXC, file of 2026-09-25 |
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.