Patent US3640911A successfully refreshed from Google Patents.
US3640911A
Expired / Lapsed
US
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Phenolic foam process
Assignee: Union Carbide Corp
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Filing: 1969-04-04
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Granted: 1972-02-08
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Expires: 1989-04-04
Abstract
Abstract PHENOLIC FOAMS ARE PRODUCED CONTAINING A MINOR AMOUNT OF AN OLEFIN EPOXIDE AS A CATALYST PROMOTER. THE EPOXIDES CONTAIN AN OXIRANE GROUP AND ARE FREE OF ETHERIC OXYGEN. ILLUSTRATIVE THEREOF ARE ISOBUTYLENE OXIDE, VINYLCYCLOHEXANE DIOXIDE, GLYCIDOL OR 3,4-EPOXYCYCLOHEXYLMETHYL 3,4-EPOXYCYCLOHEXANECARBOXYLATE.
Inventors
- 👤 Anthony Joseph Papa
- 👤 William Robert Proops
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:15
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0023; C08J2361/00; C08J2361/04; C08J2361/06; C08J2361/08; Y; Y10; Y10S; Y10S521/00; Y10S521/911; Y10S521/913
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |