Patent US4122252A successfully refreshed from Google Patents.
US4122252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of esters
Assignee: Hoffmann La Roche Inc
•
Filing: 1977-11-30
•
Granted: 1978-10-24
•
Expires: 1997-11-30
Abstract
Abstract The present invention relates to a process for the manufacture of esters. More particularly, the invention is concerned with a process for the manufacture of esters of 2,2'-anhydro-1β-D-arabinofuranosyl-5-fluorocytosine.
Inventors
- 👤 Richard D'Souza
- 👤 Pierre-Charles Wyss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:25
CPC Classifications
C; C07; C07H; C07H19/00; C07H19/02; C07H19/04; C07H19/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
30 words
A mixed orthoester of the formula ##STR3## wherein R is alkyl containing from 1 to 6 carbon atoms and R 1 is alkyl containing from 1 to 3 carbon atoms.
Claim 2
Dependent Claim
30 words
A mixed orthoester of the formula ##STR3## wherein R is alkyl containing from 1 to 6 carbon atoms and R 1 is alkyl containing from 1 to 3 carbon atoms.
Claim 3
Dependent Claim
8 words
The compound of claim 1 which is 2',3'-O,O-(1-methoxyethylidene)-5-fluorocytidine.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |