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US3632344A
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Diazo-type material using alpha-pyrone ultraviolet radiation absorbers
Assignee: Keuffel and Esser Co
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Filing: 1969-01-15
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Granted: 1972-01-04
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Expires: 1989-01-15
Abstract
Abstract Alpha-pyrone compounds are employed to provide colorless, lightfast ultraviolet radiation absorber materials. In addition to being normally colorless these materials are noncoloring due to their colorless decomposition products. The materials provide barriers for protection from ultraviolet radiation, and when incorporated in diazo-type reproduction materials, provide broad tonal gradations. Alpha-pyrones including an azocoupling group in the molecule may be combined with light-sensitive diazonium compounds to provide two-component diazo-type material without the inclusion of additional azocoupler compounds.
Inventors
- 👤 Roland Moraw
- 👤 Johannes Munder
- 👤 Gerhard Lohaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:24
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/78; C07D311/92; C07D309/00; C07D309/34; C07D309/36; C07D309/38; C08; C08K; C08K5/00; C08K5/0008; C08K5/005; C08K5/04; C08K5/15; C08K5/151; C08K5/1545; C08K5/36; C08K5/43; C09; C09K; C09K15/00; C09K15/04; C09K15/06; G; G03; G03C; G03C1/00; G03C1/52; G03C1/61; G03C1/76; G03C1/815; G03C1/8155
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
28 words
Diazotype material according to claim 1 wherein said composition comprises, as substantially the sole azo coupler compound, said ultraviolet light absorbing pyrone compound being of the general formula;
Claim 2
Dependent Claim
19 words
Diazotype material according to claim 1 wherein said azocoupler is other than a pyrone compound as described in claim
Claim 3
Dependent Claim
11 words
Diazotype material according to claim 1 wherein said absorber is 3-bromo-4-methyl-6-(4-chloro-phenyl)-pyrone-(2).
Claim 4
Dependent Claim
11 words
Diazotype material according to claim 1 wherein said absorber is 3-carbonamide-4-methyl-6-phenyl-pyrone-(2).
Claim 5
Dependent Claim
12 words
Diazotype material according to claim 2 wherein said pyrone compound is 3-chloro-4-methyl-6-(4-(sulfonamido-3''-phenol)-phenyl)-pyrone-(2).
Claim 6
Dependent Claim
14 words
Diazotype material according to claim 2 wherein said pyrone compound is 3-chloro-4-methyl-6-(4-(sulfonamido-3''-hydroxy-4''-methyl-phenyl)-phenyl) -pyrone (2).
Claim 7
Dependent Claim
14 words
Diazotype material according to claim 2 wherein said pyrone compound is 3-chloro-4-methyl -6-(4-(sulfonamido-2''-naphthol)-phenyl)-pyrone (2).
Claim 8
Dependent Claim
16 words
Diazotype material according to claim 2 wherein said pyrone compound is 3-chloro- 4-methyl-6-(4-(sulfonamido-ethyl-2''-hydroxy-naphthoic acid amido)-phenyl)-pyrone (2).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |