US3592841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keto-carboxylic acids
Assignee: Richardson Co
•
Filing: 1967-12-01
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Granted: 1971-07-13
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Expires: 1987-12-01
Abstract
Abstract AROMATIC POLY(KETO-CARBOXYLIC) ACID COMPOSITIONS CHARACTERIZED BY POLYPHENYL MOIETIES AND USEFUL AS CROSSLINKING AGENTS FOR POLYESTERS, AS PLASTICIZERS, AND AS REACTANTS IN THE PREPARATION OF POLYMERIC COMPOSITIONS. THESE COMPOSITIONS ARE ILLUSTRATED BY 4,4''-OXYBIS(2-BENZOYL BENZOIC ACID).
Inventors
- 👤 Ronald L Broadhead
- 👤 Yedavalli Shamsunder Rao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:29
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C07; C07C; C07C65/00; C07C65/32; C07C65/40; C08G63/68; C08G69/00; C08G69/02; C08G69/26; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/092; C08K5/095
Claims Analysis
Total Claims: 0
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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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |