Patent US4224397A successfully refreshed from Google Patents.
US4224397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous tone diazo material
Assignee: Arkwright Inc
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Filing: 1979-01-26
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Granted: 1980-09-23
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Expires: 1999-01-26
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
2026-11-03 13:34
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/54; G03C1/61; G03C5/00; G03C5/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
77 words
A diazotype material useful for making duplicates of continuous tone originals comprising a transparent film support and a layer coated thereon consisting essentially of a binder lacquer containing at least two 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 at least about 7% by weight of a bulk, broad actinic radiation-absorbing, inorganic pigment, based upon the amount of lacquer.
Claim 2
Dependent Claim
77 words
A diazotype material useful for making duplicates of continuous tone originals comprising a transparent film support and a layer coated thereon consisting essentially of a binder lacquer containing at least two 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 at least about 7% by weight of a bulk, broad actinic radiation-absorbing, inorganic pigment, based upon the amount of lacquer.
Claim 3
Dependent Claim
29 words
A diazotype material in accordance with claim 1, wherein said layer contains about 7% to about 20% by weight of said inorganic pigment, based upon the amount of lacquer.
Claim 4
Dependent Claim
14 words
A diazotype material in accordance with claim 1, wherein said inorganic pigment is silica.
Claim 5
Dependent Claim
22 words
A diazotype material in accordance with claim 1, wherein said inorganic pigment has a particle size of up to approximately 50 microns.
Claim 6
Dependent Claim
22 words
A diazotype material in accordance with claim 1, wherein said inorganic pigment has a particle size of approximately 1 to 50 microns.
Claim 7
Dependent Claim
19 words
A diazotype material in accordance with claim 1, wherein the continuous tone original is a silver halide X-ray film.
Claim 8
Dependent Claim
16 words
A diazotype material in accordance with claim 1, wherein said lacquer further contains a blue dye.
Claim 9
Dependent Claim
16 words
A diazotype material in accordance with claim 1, wherein said film support has a blue tint.
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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) | 1983-09-23 | 1984-03-24 | 1984-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-23 | 1988-03-24 | 1988-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-23 | 1992-03-24 | 1992-09-23 | $7700.00 | Window Closed / Lapsed |