US3835120A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyimides of conjugated azo diamines
Assignee: Monsanto Co
•
Filing: 1973-10-15
•
Granted: 1974-09-10
•
Expires: 1993-10-15
Abstract
Abstract A class of ordered fiber and film forming aromatic polyamide acids and corresponding polyimides derived from symmetrical conjugated and pseudo-conjugated aromatic azo diamines have been found to possess excellent thermal, mechanical and electrical properties useful in fibers, films and other shaped articles.
Inventors
- 👤 H Bach
- 👤 H Hinderer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:10
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1096; C08G73/1067; C08G73/1071
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
11 words
A polyimide consisting essentially of recurring structural units of the formula
Claim 2
Dependent Claim
8 words
The polyimide of claim 2 consisting essentially of
Claim 3
Dependent Claim
8 words
The polyimide of claim 2 consisting essentially of
Claim 4
Dependent Claim
10 words
A film consisting essentially of the polymer of claim 1.
Claim 5
Dependent Claim
10 words
A film consisting essentially of the polymer of claim 2.
Claim 6
Dependent Claim
9 words
A fiber consisting of the polymer of claim 2.
References Cited (Backward Citations)
US3455879A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |