Patents
US 9981979 B2: Process for the formation of hydrocodone bitatrate
- Granted
- 2018-05-29
- Filed
- 2015-11-02 application 15523054
- Type
- Utility · 18 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
There is provided a novel process for the preparation of a hydrocodone salt. In particular, there is provided a novel process for the preparation of a free-flowing slurry of a hydrocodone salt, for example, a free-flowing slurry of hydrocodone bitartrate hemipentahydrate.
Source: PVGPATDIS, file of 2026-04-10 (ipg180529.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| CAMBREX CHARLES CITY, INC. 9 patents | US company or organization | Charles City, IA | PVGPATDIS, file of 2026-04-10 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| Michael R. Tracey | Charles City, IA | 11 | PVGPATDIS, file of 2026-04-10 | |
| Zhiming Dong | Charles City, IA | 4 | PVGPATDIS, file of 2026-04-10 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| C07D | Heterocyclic compounds | C07D489/04 | PVGPATDIS, file of 2026-04-10 |
| A61K | Preparations for medical, dental or toiletry purposes | A61K31/485 | 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 |
|---|---|---|---|---|---|
| 2025-03-06 | Release of security interest Release of first lien security interest in patents | ROYAL BANK OF CANADA signed 2025-03-06 | AVISTA PHARMA SOLUTIONS, INC. EAST RUTHERFORD, NJ CAMBREX CHARLES CITY, INC. EAST RUTHERFORD, NJ SNAPDRAGON CHEMISTRY, INC. EAST RUTHERFORD, NJ | 70438/333 | ECORSEXC, file of 2026-09-25 |
| 2020-12-07 | Release of security interest Release of second lien security interest in patents | ROYAL BANK OF CANADA, AS COLLATERAL AGENT signed 2020-12-07 | AVISTA PHARMA SOLUTIONS, INC. DURHAM, NC | 54630/307 | ECORSEXC, file of 2026-09-25 |
| 2019-12-04 | Release of security interest Notice of release of security interest in patents | WELLS FARGO BANK, NATIONAL ASSOCIATION signed 2019-12-04 | CAMBREX CHARLES CITY, INC. CHARLES CITY, IA | 51283/903 | ECORSEXC, file of 2026-09-25 |
| 2019-12-04 | Security interest Security interest First lien patent security agreement | AVISTA PHARMA SOLUTIONS, INC. signed 2019-12-04 CAMBREX CHARLES CITY, INC. signed 2019-12-04 | ROYAL BANK OF CANADA, AS COLLATERAL AGENT TORONTO | 51283/877 | ECORSEXC, file of 2026-09-25 |
| 2019-12-04 | Security interest Security interest Second lien patent security agreement | AVISTA PHARMA SOLUTIONS, INC. signed 2019-12-04 CAMBREX CHARLES CITY, INC. signed 2019-12-04 | ROYAL BANK OF CANADA, AS COLLATERAL AGENT TORONTO | 51196/80 | ECORSEXC, file of 2026-09-25 |
| 2019-01-03 | Security interest Security interest Security interest | CAMBREX CHARLES CITY, INC. signed 2019-01-02 | WELLS FARGO BANK, NATIONAL ASSOCIATION, AS ADMINISTRATIVE AGENT CHARLOTTE, NC | 47895/53 | ECORSEXC, file of 2026-09-25 |
| 2017-05-26 | Assignment Assignment of assignor's interest | DONG, ZHIMING ERIC signed 2017-05-12 TRACEY, MICHAEL ROBERT signed 2017-05-12 | CAMBREX CHARLES CITY, INC. CHARLES CITY, IA | 42515/640 | 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.