US2731447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel polyimides
Assignee: EIDP Inc
•
Filing: 1954-06-11
•
Granted: 1956-01-17
•
Expires: 1974-06-11
Abstract
No abstract record available.
Inventors
- 👤 William F Gresham
- 👤 Jr Marcus A Naylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:35
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1046; C08G73/1053
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A LINEAR POLYIMIDE IN WHICH THE DIAMINE COMPONENT IS A DIAMINOALKANE HAVING AT LEAST FOUR CARBON ATOMS SEPARATING PRIMARY AMINO GROUPS AND IN WHICH THE OTHER IMIDE-FORMING COMPONENT IS A MEMBER OF THE CLASS CONSISTING OF ACIDS OF THE FORMULA
Claim 2
Dependent Claim
40 words
A LINEAR POLYIMIDE IN WHICH THE DIAMINE COMPONENT IS A DIAMINOALKANE HAVING AT LEAST FOUR CARBON ATOMS SEPARATING PRIMARY AMINO GROUPS AND IN WHICH THE OTHER IMIDE-FORMING COMPONENT IS A MEMBER OF THE CLASS CONSISTING OF ACIDS OF 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) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |