US3615575A
Expired / Lapsed
US
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Two-component black-line diazo-type material
Assignee: Keuffel and Esser Co
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Filing: 1968-07-30
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Granted: 1971-10-26
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Expires: 1988-07-30
Abstract
Abstract Diazo-type material useful in the preparation of neutral black copies and having improved storage stability includes, with a pphenylene-diamine light-sensitive diazonium compound, a bluecoupler and a yellow-coupler which is a bis-cyanoacetic-amide.
Inventors
- 👤 Herbert Rauhut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:40
CPC Classifications
C; C07; C07C; C07C255/00; G; G03; G03C; G03C1/00; G03C1/52; G03C1/58
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
28 words
Diazo-type composition according to claim 1 wherein: X stands for an alkylene or a dialkylamino group with 2 to 6 carbon atoms; and R1 and R2 are hydrogen.
Claim 2
Dependent Claim
12 words
Diazo-type composition according to claim 2 wherein said yellow azocoupler is 1,2-bis-(cyanoacetylamino)ethane.
Claim 3
Dependent Claim
12 words
Diazo-type composition according to claim 2 wherein said yellow azocoupler is 1,4-bis-(cyanoacetylamino)butane.
Claim 4
Dependent Claim
12 words
Diazo-type composition according to claim 2 wherein said yellow azocoupler is 1,6-bis-(cyanoacetylamino)hexane.
Claim 5
Dependent Claim
12 words
Diazo-type composition according to claim 2 wherein said yellow azocoupler is 1,2-bis-(cyanoacetylamino)propane.
Claim 6
Dependent Claim
12 words
Diazo-type composition according to claim 2 wherein said yellow azocoupler is bis-(cyanoacetylaminoethyl)amine.
Claim 7
Dependent Claim
14 words
Diazo-type composition according to claim 2 wherein said diazonium compound is a 1-diazo-4-morpholino-2,5,-dialkoxybenzene salt.
Claim 8
Dependent Claim
15 words
Diazo-type composition according to claim 2 wherein said blue azocoupler is a 2-hydroxy-3-naphthoic acid amide.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |