US3620997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quinoxaline-anthraquinone polymers
Assignee: Research Corp
•
Filing: 1969-12-15
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Granted: 1971-11-16
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Expires: 1989-12-15
Abstract
Abstract Tetrachloroquinoxalines are condensed with 1,2,5,6tetraaminoanthraquinone to produce polymers characterized by the presence of a quinoxaline nucleus and an anthraquinone nucleus in the repeating unit of the polymer. The polymers are useful in the preparation of heat-resistant articles intended for use at elevated temperatures.
Inventors
- 👤 Carl S Marvel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:45
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/0683; C08G73/0694; Y; Y10; Y10S; Y10S428/00; Y10S428/92
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
12 words
Fiber and film forming polymers consisting essentially of the recurring structural unit:
Claim 2
Dependent Claim
12 words
Fiber and film forming polymers consisting essentially of the recurring structural unit:
Claim 3
Dependent Claim
9 words
Compositions according to claim 3 wherein Z is O.
Claim 4
Dependent Claim
9 words
Compositions according to claim 3 wherein Z is SO2.
References Cited (Backward Citations)
US3484387A
Cited
US3475374A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |