Patent US5400054A successfully refreshed from Google Patents.
US4335210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing L-cysteine
Assignee: Cornell Research Foundation Inc
•
Filing: 1981-02-11
•
Granted: 1982-06-15
•
Expires: 2001-02-11
Abstract
Abstract L-2-oxothiazolidine-4-carboxylate, a sulfur analog of 5-oxoproline, is cleaved by the enzyme 5-oxo-L-prolinase to form cysteine, thus providing the basis for a cysteine delivery system by the addition of L-2-oxothiazolidine-4-carboxylate to base amino acid solutions or by injecting it directly into in vivo cells.
Inventors
- 👤 Alton Meister
- 👤 Joanne M. Williamson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:44
CPC Classifications
C; C12; C12P; C12P13/00; C12P13/04; C12P13/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
Method for the production of L-cysteine which comprises subjecting L-2-oxothiazolidine-4-carboxylate to the action of 5-oxo-L-prolinase in the presence of adenosine triphosphate.
Claim 2
Dependent Claim
21 words
Method for the production of L-cysteine which comprises subjecting L-2-oxothiazolidine-4-carboxylate to the action of 5-oxo-L-prolinase in the presence of adenosine triphosphate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-14 | 1985-12-14 | 1986-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-14 | 1989-12-14 | 1990-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-14 | 1993-12-14 | 1994-06-15 | $7700.00 | Window Closed / Lapsed |