Patent US3721722A successfully refreshed from Google Patents.
US3721722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thickenable unsaturated polyester resin system
Assignee: Beazer East Inc
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Filing: 1970-07-16
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Granted: 1973-03-20
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Expires: 1990-07-16
Abstract
Abstract AN UNSATURATED POLYESTER RESIN CAPABLE OF BEING CHEMICALLY THICKENED COMPRISES: (1) AN UNSATURATED POLYESTER; (2) A COPOLYMERIZABLE VINYL ARYL MONOMER; (3) A POLYMERIZABLE VINYL ETHER AND (4) AN ACRYLONITRILE-ZINC CHLORIDE COMPLEX. THE POLYESTER RESIN IS CHEMICALLY THICKENED BY THE POLYMERIZATION OF THE VINYL ETHER WHICH IS CATALYZED BY THE ACRYLONITRILE-ZINC CHLORIDE COMPLEX. THE POLYESTER RESIN IS, THEREFORE, THICKENED BEFORE THE INITIATION OF THE VINYL COPOLYMERIZATION BETWEEN THE UNSATURATED POLYESTER AND THE COPOLYMERIZABLE VINYL ARYL MONOMER.
Inventors
- 👤 M Baum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:58
CPC Classifications
C; C08; C08F; C08F283/00; C08F283/01; C08L; C08L67/00; C08L67/06
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |