Patent US3712907A successfully refreshed from Google Patents.
US3712907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of substituted phthalimido-n-carboxylic acids
Assignee: Bayer AG
•
Filing: 1969-05-07
•
Granted: 1973-01-23
•
Expires: 1989-05-07
Abstract
Abstract PROCESS FOR THE PRODUCTION OF SUBSTITUENTS PHTHALIMIDON-CARBOXYLIC ACIDS BY REACTION OF A LACTAM HAVING MORE THAN 3 RING MEMBERS WITH A PHTHALIC ACID ANHYDRIDE DERIVATIVES BEING SUBSTITUTED BY AN ELECTROPHALIC SUBSTITUTENT WHICH IS MORE ELECTRONEGATIVE THAN HYDROGEN.
Inventors
- 👤 H Gilch
- 👤 L Bottenbruch
- 👤 W Zecher
- 👤 R Merten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:39
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/44; C07D209/48; C07D487/00; C07D487/02; C07D487/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |