US4148646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous tone diazotype process
Assignee: Arkwright Inc
•
Filing: 1977-06-13
•
Granted: 1979-04-10
•
Expires: 1997-06-13
Abstract
Abstract A diazotype material useful for making duplicates of continuous tone originals, such as X-ray films, comprising a transparent film support having a coating of a layer thereon consisting essentially of at least two light-sensitive diazo compounds having different photolysis rates, couplers for the diazo compounds, an ultraviolet radiation absorbing material and homogeneously distributed in the layer at least about 7% by weight, based on the weight of lacquer, of an inert particulate material such as silica. The use of this material makes it possible to approximate a logarithmic photolysis, thereby providing sufficient linearity in the corresponding characteristic curve to achieve the desired duplicating results.
Inventors
- 👤 Gilbert Zweig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:10
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/76; G03C1/95; Y; Y10; Y10S; Y10S430/00; Y10S430/167
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
110 words
A process for producing duplicates of continuous tone originals with a diazotype material which comprises exposing a diazo film to actinic radiation through the original, said diazo film comprising a transparent film support and a layer coated thereon consisting essentially of a binder lacquer containing at least two light-sensitive diazonium compounds having different photolysis rates, at least one coupler for the diazonium compounds, a non-photolyzable ultraviolet radiation absorbing material, and homogeneously distributed in said layer as least about 7% by weight of a bulk, broad actinic radiation-absorbing inert particulate material, based upon the amount of lacquer, and developing the exposed film to provide an azo dye image of the original.
Claim 2
Dependent Claim
110 words
A process for producing duplicates of continuous tone originals with a diazotype material which comprises exposing a diazo film to actinic radiation through the original, said diazo film comprising a transparent film support and a layer coated thereon consisting essentially of a binder lacquer containing at least two light-sensitive diazonium compounds having different photolysis rates, at least one coupler for the diazonium compounds, a non-photolyzable ultraviolet radiation absorbing material, and homogeneously distributed in said layer as least about 7% by weight of a bulk, broad actinic radiation-absorbing inert particulate material, based upon the amount of lacquer, and developing the exposed film to provide an azo dye image of the original.
Claim 3
Dependent Claim
27 words
The process of claim 1, wherein said layer contains about 7% to about 20% by weight of said inert particulate material, based upon the amount of lacquer.
Claim 4
Dependent Claim
14 words
The process of claim 1, wherein said inert particulate material is an inorganic pigment.
Claim 5
Dependent Claim
12 words
The process of claim 1, wherein said inert particulate material is silica.
Claim 6
Dependent Claim
24 words
The process of claim 1, wherein said inert particulate material is an inorganic pigment having a particle size of approximately 1 to 50 microns.
Claim 7
Dependent Claim
24 words
The process of claim 1, wherein said inert particulate material is an inorganic pigment having a particle size of up to approximately 50 microns.
Claim 8
Dependent Claim
13 words
The process of claim 1, wherein said lacquer further contains a blue dye.
Claim 9
Dependent Claim
13 words
The process of claim 1, wherein said film support has a blue tint.
Claim 10
Dependent Claim
16 words
The process of claim 1, wherein the continuous tone original is a silver halide X-ray film.
References Cited (Backward Citations)
US2603564A
Cited
US2793118A
Cited
US3069268A
Cited
US3365296A
Cited
US3525618A
Cited
US3484241A
Cited
US3615475A
Cited
US3661591A
Cited
US3679415A
Cited
US3836369A
Cited
US3996056A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |