US3445477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of trimellitic acid imides
Assignee: Bayer AG
•
Filing: 1965-01-12
•
Granted: 1969-05-20
•
Expires: 1985-01-12
Abstract
No abstract record available.
Inventors
- 👤 Gerhard Muller
- 👤 Rudolf Merten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:02
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/44; C07D209/48; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
A PROCESS FOR THE PRODUCTION OF TRIMELLITE ACID IMIDE WHICH COMPRISES REACTING TRIMELLITIC ACID ANHYDRIDE WITH AN ORGANIC ISOCYANATE SELECTED FROM THE GROUP CONSISTING OF
Claim 2
Dependent Claim
25 words
A PROCESS FOR THE PRODUCTION OF TRIMELLITE ACID IMIDE WHICH COMPRISES REACTING TRIMELLITIC ACID ANHYDRIDE WITH AN ORGANIC ISOCYANATE SELECTED FROM THE GROUP CONSISTING OF
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) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |