US3759870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester based on hydroxybenzoic acids
Assignee: BP Corp North America Inc
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Filing: 1970-08-24
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Granted: 1973-09-18
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Expires: 1990-08-24
Abstract
Abstract POLYESTERS BASED ON HYDROXYBENZOIC ACIDS MAY BE PRODUCED BY CONDENSING, IN A LIQUID STATE AT AN ELEVATED TEMPERATURE, A MONOMER HAVING THE FORMULA R-O-C6H4-COO-R'' TO FORM A LINEAR POLYESTER HAVING THE FORMULA R-(O-C6H4-CO)-O-R'' WHEREIN THE BRACKETED PORTION REPESENTS THE RECURRING STRUCTUREAL UNIT; THE OXY FUNCTION OF THE POLYESTER AND THE RO GROUP OF THE MONOMER ARE PARA OR META TO THE CARBOXYLIC GROUPF R IS HYDROGEN, ACETYL, PROPIONYL OR BENZOYL; AND R'' IS PHENYL OR SUBSTITUTED PHENYL.
Inventors
- 👤 J Economy
- 👤 B Nowak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:45
CPC Classifications
C; C08; C08G; C08G63/00; 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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |