US3247165A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyimides
Assignee: 3M Co
•
Filing: 1962-11-15
•
Granted: 1966-04-19
•
Expires: 1982-11-15
Abstract
No abstract record available.
Inventors
- 👤 Jacob S Rodia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:14
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1085
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
A COPOLYMER OF BENZOPHENONE TETRACARBOXYLIC ACID DIANHYDRIDE WITH AN AMINE OF THE FORMULA:
Claim 2
Dependent Claim
13 words
A COPOLYMER OF BENZOPHENONE TETRACARBOXYLIC ACID DIANHYDRIDE WITH AN AMINE OF THE FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |