Patent US2998429A successfully refreshed from Google Patents.
US2998429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of isomaleimides
Assignee: Union Carbide Corp
•
Filing: 1959-11-24
•
Granted: 1961-08-29
•
Expires: 1979-11-24
Abstract
No abstract record available.
Inventors
- 👤 Carol K Sauers
- 👤 Robert J Cotter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:21
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/34; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
PROCESS FOR THE PREPARATION OF AN N-SUBSTITUTED ISOMALEIMIDE WHICH COMPRISES ADMIXING ANN N-SUBSTITUTED MALEAMIC ACID HAVING THE FORMULA:
Claim 2
Dependent Claim
18 words
PROCESS FOR THE PREPARATION OF AN N-SUBSTITUTED ISOMALEIMIDE WHICH COMPRISES ADMIXING ANN N-SUBSTITUTED MALEAMIC ACID HAVING THE FORMULA:
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) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |