US2528267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eobeet j
Assignee: —
•
Filing: —
•
Granted: 1950-10-31
•
Expires: 1967-10-31
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:11
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/82; C07C209/86; C07C209/88; C07C215/00; C07C215/02; C07C215/04; C07C215/06; C07C215/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
THE PROCESS OF RESOLVING COMPOSITIONS CONTAINING AT LEAST ONE RACEMIC AMINE WHICH COMPRISES REACTING SAID COMPOSITIONS WITH AN OPTICALLY ACTIVE ISOMER OF PYRROLIDONE CARBOXYLIC ACID, SEPARATING THE RESULTANT REACTION PRODUCT THEREOF, AND TREATING THE SAME WITH A BASE WHICH IS MORE BASIC THAN THE AMINE REACTANT.
Claim 2
Dependent Claim
46 words
THE PROCESS OF RESOLVING COMPOSITIONS CONTAINING AT LEAST ONE RACEMIC AMINE WHICH COMPRISES REACTING SAID COMPOSITIONS WITH AN OPTICALLY ACTIVE ISOMER OF PYRROLIDONE CARBOXYLIC ACID, SEPARATING THE RESULTANT REACTION PRODUCT THEREOF, AND TREATING THE SAME WITH A BASE WHICH IS MORE BASIC THAN THE AMINE REACTANT.
References Cited (Backward Citations)
US2112329A
Cited
US2276508A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-30 | 1954-05-01 | 1954-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-30 | 1958-05-01 | 1958-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-30 | 1962-05-01 | 1962-10-31 | $7700.00 | Window Closed / Lapsed |