US2957880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the conversion of stereoisomers
Assignee: CIBA PHARM PROD Inc
•
Filing: 1958-01-22
•
Granted: 1960-10-25
•
Expires: 1978-01-22
Abstract
No abstract record available.
Inventors
- 👤 Rometsch Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:14
CPC Classifications
C; C07; C07D; C07D211/00; C07D211/04; C07D211/06; C07D211/08; C07D211/18; C07D211/34; C07D211/30; C07D211/32; C07D211/36; C07D211/54
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
14 words
THE B1-ANTIPODE FORM OF A-PHENYL-A-PIPERIDYL-(2)ACETIC ACID LOWER ALKYL ESTER FREE FROM THE B2-ANTIPODE FORM.
Claim 2
Dependent Claim
14 words
THE B1-ANTIPODE FORM OF A-PHENYL-A-PIPERIDYL-(2)ACETIC ACID LOWER ALKYL ESTER FREE FROM THE B2-ANTIPODE FORM.
Claim 3
Dependent Claim
12 words
THE B1-ANTIPODE FORM OF A-PHENYL-A-PIPERIDYL-(2) ACETIC ACID FREE FROM THE B2-ANTIPODE FORM.
Claim 4
Dependent Claim
12 words
THE B1-ANTIPODE FORM OF A-PHENYL-A-PIPERIDYL-(2) ACETIC ACID FREE FROM THE B2-ANTIPODE FORM.
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) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |