Patent US3607795A successfully refreshed from Google Patents.
US3607795A
Expired / Lapsed
US
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Cellular plastics of epoxy resins and process for their manufacture
Assignee: Hoechst AG
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Filing: 1969-01-17
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Granted: 1971-09-21
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Expires: 1989-01-17
Abstract
Abstract A process for foaming and hardening an epoxy resin or mixtures of an epoxy resin with a lactone or a cyclic ether under the action of inert readily /volatile organic solvents as foaming agents and a mixture of a Lewis acid with phosphoric acid and/or a phosphoric acid derivative containing at least one POP group.
Inventors
- 👤 Ernst Nolken
- 👤 Hans Dexheimer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:47
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/141; C08G; C08G59/00; C08G59/14; C08G59/1405; C08G59/1422; C08J9/143; C08J2363/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
19 words
The process of claim 1 wherein the lactone or cyclic ether is used as solvent for the hardener combination.
Claim 2
Dependent Claim
11 words
The process of claim 1 wherein the lactone is epsilon -caprolactone.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the epoxy resin is a diglycide ether of 4,4''-dioxy-diphenyl-2,2-propane.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the Lewis acid is boron trifluoride.
Claim 5
Dependent Claim
22 words
The process as defined in claim 1 and wherein the a component is orthophosphoric acid and the b component is boron trifluoride
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |