Patent US4310769A successfully refreshed from Google Patents.
US3733305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curable low softening epoxy resins containing bisphenol s
Assignee: Witco Corp
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Filing: 1971-02-03
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Granted: 1973-05-15
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Expires: 1991-02-03
Abstract
Abstract CATALYST-FREE, CURABLE, SUBSTANTIALLY LINEAR THERMOSETTING EPOXY RESINS HAVING LOW SOFTENING POINTS AND GOOD MELT VISCOSITY STABILITY, ARE MADE AVAILABLE BY THE REACTION OF A BIS(HYDROXYPHENYL)SULFONE (BISPHENOL S) WITH A BIS(GLLYCIDYLOXYPHENYL) SULFONE (DIEPOXY BISPHENOL S) IN THE HOT MOLTEN STATE, WITHOUT CATALYST.
Inventors
- 👤 P Loewrigkeit
- 👤 J Spitsbergen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:34
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/30; C08G59/302; C08G59/02; C08G59/04; C08G59/06; C08G59/066; C08G59/40; C08G59/62; C08G59/621
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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |