Patent US4065401A successfully refreshed from Google Patents.
US4065401A
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Blowing agent mixture
Assignee: Bayer AG
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Filing: 1975-08-22
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Granted: 1977-12-27
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Expires: 1995-08-22
Abstract
Abstract The invention refers to a blowing agent composition consisting of 1,4 butan-diol-bis-(carbonic acid ester-benzoic acid anhydride) and silicon dioxide. Silicon dioxide reduces the decomposition temperature of the anhydride while at the same time increasing the yield of gas substantially.
Inventors
- 👤 Wolfgang Cohnen
- 👤 Gerhard Apel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:00
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/08; G; G10; G10L; G10L15/00; G10L15/22; G10L2015/226; G10L2015/228; Y; Y10; Y10S; Y10S264/00; Y10S264/05
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
28 words
Blowing agent mixture consisting of from 85 - 60%, by weight, of 1,4-butanediol bis-(carbonic acid ester-benzoic acid anhydride) and from 15 - 40%, by weight, of silicon dioxide.
Claim 2
Dependent Claim
28 words
Blowing agent mixture consisting of from 85 - 60%, by weight, of 1,4-butanediol bis-(carbonic acid ester-benzoic acid anhydride) and from 15 - 40%, by weight, of silicon dioxide.
Claim 3
Dependent Claim
28 words
Blowing agent mixture according to claim 1, characterised in that the siicon dioxide has a surface area according to B.E.T. of from 50 to 400 m 2 /g.
Claim 4
Dependent Claim
23 words
Blowing agent mixture according to claim 2, characterised in that the water content of the silicon dioxide is less than 1.5% by weight.
References Cited (Backward Citations)
DE1252891B
Cited
US3743605A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |