Patent US3274159A successfully refreshed from Google Patents.
US3274159A
Expired / Lapsed
US
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Polyester imides of trimellitic anhydride
Assignee: Union Carbide Corp
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Filing: 1963-01-07
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Granted: 1966-09-20
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Expires: 1983-01-07
Abstract
No abstract record available.
Inventors
- 👤 Rudolph W Kluiber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:02
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/685; C08G63/6854; C08G63/6856; C08G73/00; C08G73/06; C08G73/10; C08G73/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
POLYESTER IMIDE HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
6 words
POLYESTER IMIDE HAVING THE GENERAL 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) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |