US3785826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diazotype materials for blackline images
Assignee: GAF Corp
•
Filing: 1972-04-26
•
Granted: 1974-01-15
•
Expires: 1992-04-26
Abstract
Abstract Sensitizing agents for ammonia vapor developable black-line twocomponent diazotype sensitizing formulations comprising diazotized derivatives of 4-N-pyrrolidinyl-3-alkylparaphenylenediamine are employed with a mixture of coupling components which include an acetoacetamide, a naphthol, a diresorcyl compound alone or also with resorcinol.
Inventors
- 👤 C Slimowicz
- 👤 W Welch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:49
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/58
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
15 words
A composition according to claim 1 wherein said diazo sensitizing compound is 3-methyl-4-pyrrolidinyl benzene-diazonium chlorozincate.
Claim 2
Dependent Claim
12 words
A composition according to claim 1 wherein said diresorcyl is diresorcyl sulfide.
Claim 3
Dependent Claim
12 words
A composition according to claim 1 wherein said diresorcyl is diresorcyl sulfoxide.
Claim 4
Dependent Claim
21 words
A light sensitive diazotype element for the production of blackline images comprising a base coated with the composition of claim 1.
Claim 5
Dependent Claim
12 words
A diazotype element according to claim 5 wherein said base comprises paper.
Claim 6
Dependent Claim
20 words
A diazotype element according to claim 5 provided with a pre-coated layer intermediate the base and light sensitive diazo layer.
Claim 7
Dependent Claim
19 words
A diazotype element according to claim 5 wherein said pre-coat comprises an aqueous emulsion of polyvinyl acetate and silica.
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |