Patent US3634362A successfully refreshed from Google Patents.
US3634362A
Expired / Lapsed
US
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Process for the manufacture of polyoxaqides in the presence of a glycol
Assignee: Imperial Chemical Industries Ltd
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Filing: 1970-02-02
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Granted: 1972-01-11
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Expires: 1990-02-02
Abstract
Abstract IMPROVED PROCESS FOR THE MANUFACTURE OF HIGH MOLECULAR POLYOXAMIDES AND COPOLYOXAMIDES BY CONDENSING TOGETHER AT LEAST ONE DIAMINE AND AN OXALIC ACID DI-ALKYL ESTER IN THE PRESENCE OF A GLYCOL OF THE FORMULA: HO-CH2-CH(-OH)-R WHEREIN R IS HYDROGEN, LOWER ALKYL OR HYDROXYMETHYL, AND THE USE OF THE SAID POLYMERS FOR THE PRODUCTION OF FILAMENTS, FIBRES, MOLDED OR SHAPED ARTICLES OR AS COATINGS FOR METAL ARTICLES.
Inventors
- 👤 Joseph Oldham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:02
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/44; C08G69/02; C08G69/26
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |