US3078279A
Expired / Lapsed
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Benzophenone-tetracarboxylic dianhydrides
Assignee: Gulf Research and Development Co
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Filing: 1960-09-01
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Granted: 1963-02-19
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Expires: 1980-09-01
Abstract
No abstract record available.
Inventors
- 👤 John H Mccracken
- 👤 Schulz John Gustav David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:27
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C07; C07C; C07C205/00; C07C205/49; C07C205/57; C07C205/61; C07C51/00; C07C51/16; C07C51/21; C07C51/255; C07C51/265; C07C51/27; C07C51/275; C07C65/00; C07C65/32; C07C65/34; C07C65/40; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/4223; C08G63/00; C08G63/02; C08G63/12; C08G63/123; C08G63/127; C08G63/13; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/22; C07C2603/26
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
7 words
AN ANHYDRIDE HAVING THE FOLLOWING STRUCTURAL 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) | 1966-02-18 | 1966-08-20 | 1967-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-18 | 1970-08-20 | 1971-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-18 | 1974-08-20 | 1975-02-19 | $7700.00 | Window Closed / Lapsed |