Patent US3790528A successfully refreshed from Google Patents.
US3790528A
Expired / Lapsed
US
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Process for preparation of oxybenzoyl polymer
Assignee: Nippon Soda Co Ltd
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Filing: 1971-12-27
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Granted: 1974-02-05
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Expires: 1991-12-27
Abstract
Abstract A PROCESS FOR PREPARATION OF OXYBENZOYL POLYMERS COMPRISING REACTING M- OR P-HYDROXYBENZOIC ACIDS HAVING OR NOT HAVING SUBSTITUENT ON AROMATIC NUCLEUS OR ALKALINE SALTS THEREOF WITH ACID-HALOGENATION AGENT IN A MOLE RATE OF 1 MOLE OF THE SAID HYDROXYBENZOIC ACIDS OR ALKALINE SALTS THEREOF FOR MORE THAN 0.5 MOLE OF ACID-HALOGENATION AGENT.
Inventors
- 👤 K Tesaki
- 👤 M Hiraoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:15
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/682; C08G63/6822; C08G63/02; C08G63/06; C08G63/065
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |