US3297723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
5-phenyl-5 lower alkyl pentane-1, 2, 3, 4 tetracarboxylic acids and anhydrides
Assignee: Gulf Research and Development Co
•
Filing: 1964-12-21
•
Granted: 1967-01-10
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Expires: 1984-12-21
Abstract
No abstract record available.
Inventors
- 👤 Charles M Selwitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:03
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/4223; C07; C07C; C07C51/00; C07C51/54; C07C51/567; C07C57/00; C07C57/30; C07C57/34; C07F; C07F17/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
5-PHENYL-5-LOWER ALKYL PENTANE-1,2,3,4-TETRACARBOXYLIC ACID DIANHYDRIDE.
Claim 2
Dependent Claim
5 words
5-PHENYL-5-LOWER ALKYL PENTANE-1,2,3,4-TETRACARBOXYLIC ACID DIANHYDRIDE.
References Cited (Backward Citations)
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Cited
US2826556A
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US3030387A
Cited
US3058921A
Cited
US3032559A
Cited
US3071597A
Cited
US3128287A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |