US3825522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of self-extinguishing epoxy resins
Assignee: Societa Italiana Resine SpA SIR
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Filing: 1972-12-11
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Granted: 1974-07-23
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Expires: 1992-12-11
Abstract
Abstract SOLID AND SELF-EXTINGUISHING EPOXY RESINS HAVING HIGH EPOXY EQUIVALENT VALUES, AND WHICH PRODUCE SOLUTIONS HAVING LOW VISCOSITY LEVELS, ARE PREPARED BY A PROCESS WHICH CONSISTS ESSENTIALLY IN REACTING BISPHENOL A WITH AN INTERMEDIATE EPOXY PRODUCT OBTAINED BY DEHYDROCHLORINATING THE PRODUCTS OF REACTION BETWEEN EPICHLOROPHYDRIN AND HYDROXYLATE DERIVATIVES O HALOGENATED DIPHENYLS OR DIPHENYL METHANES.
Inventors
- 👤 S Vargiu
- 👤 S Giovanni
- 👤 M Pitzalis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:15
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/02; C08G59/04; C08G59/18; C08G59/20; C08G59/22; C08G59/30
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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |