Patent US3699085A successfully refreshed from Google Patents.
US3699085A
Expired / Lapsed
US
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Preparation of p-benzamide polymers and intermediates thereof
Assignee: EIDP Inc
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Filing: 1971-04-20
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Granted: 1972-10-17
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Expires: 1991-04-20
Abstract
Abstract A PROCESS WHICH COMPRISES REACTING P-AMINOBENZOIC ACID OR ITS HYDROCHLORIDE WITH THIONYL CHLORIDE IN THE PRESENCE OF A NITROGEN CONTAINING BASE COMPOUND AT A TEMPERATURE OF FROM ABOUT -10*C. TO 95*C. TO PREPARE HIGH MOLECULAR WEIGHT P-BENZAMIDE POLYMERS AND ONE OR MORE INTERMEDIATES THEREFOR.
Inventors
- 👤 Thomas Albert Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:15
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/12
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |