US3664937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitizing molding and coating compositions with benzoin-silyl-esters
Assignee: Bayer AG
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Filing: 1971-05-27
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Granted: 1972-05-23
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Expires: 1991-05-27
Abstract
Abstract The invention relates to possibly Alpha -substituted benzoinsilyl-esters which are useful photosensitizers for the photopolymerization of polymerizable compounds or compound mixtures including mixtures of unsaturated polyesters and copolymerizable monomeric compounds.
Inventors
- 👤 Karl Fuhr
- 👤 Hugo Vernalcken
- 👤 Hans-Georg Heine
- 👤 Hans Rudolph
- 👤 Hermann Schnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:54
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/46; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/18; C07F7/1804; C08F283/00; C08F283/01
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
17 words
The process of claim 1 wherein R and R'''' and R'''''' are hydrogen and R'' is methyl.
Claim 2
Dependent Claim
17 words
The process of claim 1 herein R and R'' are methyl and R'''' and R'''''' are hydrogen.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein R is ethyl, R'' is methyl and R'''' and R'''''' are hydrogen.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein R is allyl or phenyl, R'' is methyl and R'''' and R'''''' are hydrogen.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein R is hydrogen and R'' and R'''' and R'''''' are methyl.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein R is hydrogen, R'' is methyl and R'''' and R'''''' is methoxy.
References Cited (Backward Citations)
US3582487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |