US3018290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of maleimides
Assignee: Union Carbide Corp
•
Filing: 1959-11-12
•
Granted: 1962-01-23
•
Expires: 1979-11-12
Abstract
No abstract record available.
Inventors
- 👤 Carol K Sauers
- 👤 Robert J Cotter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:03
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/44; C07D207/444; C07D207/448; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
18 words
PROCESS FOR THE PREPARATION OF AN N-SUBSTITUTED MALEIMIDE WHICH COMPRISES ADMIXING AN N-SUBSTITUTED MALEAMIC ACID OF THE FORMULA:
Claim 2
Dependent Claim
18 words
PROCESS FOR THE PREPARATION OF AN N-SUBSTITUTED MALEIMIDE WHICH COMPRISES ADMIXING AN N-SUBSTITUTED MALEAMIC ACID OF THE FORMULA:
Claim 3
Dependent Claim
15 words
PROCESS AS DEFINED IN CLAIM 1 WHEREIN THE SAID MALEAMIC ACID IS N,N''-HEXAMETHYLENE BIS-MALEMIC ACID.
References Cited (Backward Citations)
US2643258A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-01-22 | 1965-07-24 | 1966-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-22 | 1969-07-24 | 1970-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-22 | 1973-07-24 | 1974-01-23 | $7700.00 | Window Closed / Lapsed |