US2676179A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substituted delta4-tetrahydrophthalimides and production of maleimides
Assignee: Uniroyal Inc
•
Filing: 1951-01-04
•
Granted: 1954-04-20
•
Expires: 1971-01-04
Abstract
No abstract record available.
Inventors
- 👤 Erhard J Prill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:34
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/44; C07D207/444; C07D207/448; C07D209/00; C07D209/02; C07D209/44; C07D209/48
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
36 words
A METHOD OF MAKING MALEIMIDE AND N-SUBSTITUTED DERIVATIVES THEREOF WHICH COMPRISES THERMALLY DECOMPOSING IN THE VAPOR STATE, AT A TEMPERATURE IN THE RANGE FROM ABOUT 300* C. TO ABOUT 600* C., A COMPOUND OF THE FORMULA
Claim 2
Independent Claim
36 words
A METHOD OF MAKING MALEIMIDE AND N-SUBSTITUTED DERIVATIVES THEREOF WHICH COMPRISES THERMALLY DECOMPOSING IN THE VAPOR STATE, AT A TEMPERATURE IN THE RANGE FROM ABOUT 300* C. TO ABOUT 600* C., A COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
5 words
A CHEMICAL OF THE FORMULA
Claim 4
Dependent Claim
5 words
A CHEMICAL OF THE FORMULA
References Cited (Backward Citations)
US2443888A
Cited
US2524145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-19 | 1957-10-19 | 1958-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-19 | 1961-10-19 | 1962-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-19 | 1965-10-19 | 1966-04-20 | $7700.00 | Window Closed / Lapsed |