US3637618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unsaturated polyesters from epoxides and ethylenically unsaturated monocarboxylic acid mixed with solid epoxide resin
Assignee: Shell USA Inc
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Filing: 1970-03-11
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Granted: 1972-01-25
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Expires: 1990-03-11
Abstract
Abstract NEW CURABLE POLYESTER COMPOSITIONS HAVING CONTROLLED VISCOSITY WHICH ELIMINATE SURFACE TACK AND WHICH IMPART IMPROVED CHEMICAL RESISTANCE TO GLASS REINFORCED STRUCTURES ARE DISCLOSED. THESE COMPOSITIONS COMPRISE A MIXTURE OF (A) A SOLUBLE, CURABLE UNSATURATED POLYESTER OF (1) A NORMALLY LIQUID POLYEPOXIDE AND (2) AN ETHYLENICALLY UNSATURATED ORGANIC CARBOXYLIC ACID AND (B) A DISSIMILAR NORMALLY SOLID POLYMERIC MATERIAL POSSESSING A PLURALITY OF EPOXY GROUPS. ALSO DISCLOSED ARE THE ABOVE-DEFINED COMPOSITIONS CONTAINING AN ETHLENICALLY UNSATURATED MONOMER, SUCH AS STYRENE.
Inventors
- 👤 Clayton A May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:24
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/14; C08G59/1433; C08G59/1438; C08G59/1455; C08G59/1461; C08L; C08L63/00; C08L63/10; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31518
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |