Patent US829498A successfully refreshed from Google Patents.
Patent US3793030A successfully refreshed from Google Patents.
US3793030A
Expired / Lapsed
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Process for producing diazotype light-sensitive material
Assignee: Ricoh Co Ltd
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Filing: 1971-09-02
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Granted: 1974-02-19
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Expires: 1991-09-02
Abstract
Abstract A diazotype light-sensitive material is produced by coating a light-sensitive composition on a supporting sheet, said lightsensitive composition being prepared by dissolving a water soluble synthetic resin or a denatured starch in water and then dissolving in the resulting solution an azo coupling component and then adding thereto a light sensitive diazonium compound, which order of addition prevents the formation of a tar-like material or a water-insoluble precipitate by interaction of the azo coupling component and the diazonium compound.
Inventors
- 👤 T Asami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:47
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/60
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
24 words
A process according to claim 1, wherein said polyhydroxybenzoic acid is a member selected from the group consisting of 2,6-dihydroxybenzoic acid and 2,4,6-trihydroxybenzoic acid.
Claim 2
Dependent Claim
30 words
A process according to claim 1, wherein said derivative of polyhydroxybenzoic acid is a member selected from the group consisting of 2,6-dihydroxy-3,5-dichlorobenzoic acid, 2,6-dihydroxy-4-methoxybenzoic acid, 2,6-dihydroxy-3-ethyl-5-chlorobenzoic acid and 2,4,6-trihydroxy-3-benzoylbenzoic acid.
Claim 3
Dependent Claim
25 words
A process according to claim 1, wherein said coupling component is a sodium-, potassium-, calcium- or ammonium salt of said polyhydroxybenzoic acid or derivative thereof.
Claim 4
Dependent Claim
33 words
A process according to claim 1, wherein said diazonium compound is a member selected from the group consisting of 4-(N, N-diethylamino) benzene diazonium, 4-(N,N-dimethylamino)benzene diazonium, 2,3-diethoxy-4-(N-benzoylamino)benzene diazonium, 4-(N-ethyl-N-benzylamino)benzene diazonium and 4-(N-cyanoethyl-N-cyclohexylamino) benzene diazonium.
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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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |