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US3552316A
Expired / Lapsed
US
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Dtr offset master and composition for preparation of same
Assignee: AB Dick Co
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Filing: 1966-02-14
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Granted: 1971-01-05
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Expires: 1986-02-14
Abstract
Abstract An offset master adapted to be imaged to provide an ink receptive oleophilic image by diffusion transfer from an exposed silver halide negative in which the offset master is formed of a base sheet having a water soluble, water receptive, hydrophilic lithographic surface on which the image is deposited and which includes the combination on the lithographic surface of a nucleating agent for silver halide, a sensitizing dyestuff which renders more hydrophobic and ink receptive the silver image that is formed by reduction of silver halide on the lithographic surface of the master and a water soluble salt selected from the group consisting of zirconium, thorium and titanium, and which may include a cadmium salt in addition to the zirconium, thorium or titanium salt.
Inventors
- 👤 Mary K Ormsbee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:07
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/06; G03F7/07
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
18 words
An offset master as claimed in claim 1 in which the silver halide nucleating agent is stannous halide.
Claim 2
Dependent Claim
54 words
An offset master as claimed in claim 2 in which the materials are present in the ratio of one part by weight of stannous halide, 1 to 2.5 parts by weight of the salt, and in which the dyestuff is present in an amount within the range of 0.05 to 0.1 percent by weight.
Claim 3
Dependent Claim
32 words
An offset master as claimed in claim 1 in which the dyestuff is selected from the group consisting of a phthalein dye, erythrosine dye, Eosin dye, Rose Bengal, and a Rhodamine due.
Claim 4
Dependent Claim
24 words
An offset master as claimed in claim 1 in which the composition on the lithographic surface contains in addition a water soluble cadmium salt.
Claim 5
Dependent Claim
65 words
An offset master as claimed in claim 5 in which the materials are present in the ratio of one part by weight nucleating agent, 1 to 8 parts by weight of the metal salt, and 0.01 and 0.5 parts by weight of the cadmium salt, and in which the dyestuff is present in an amount within the range of 0.001 to 1.0 percent by weight.
Claim 6
Dependent Claim
77 words
An offset master as claimed in claim 5 in which the silver halide nucleating agent is stannous halide and in which the materials are present in the ratio of one part by weight of stannous halide, 1 to 8 parts by weight of the metal salt and 0.01 to 0.5 parts by weight of the cadmium salt, and in which the dyestuff is present in an amount within the range of 0.001 to 1.0 percent by weight.
Claim 7
Dependent Claim
77 words
An offset master as claimed in claim 5 in which the silver halide nucleating agent is a stannous halide and in which the materials are present in the ratio of one part by weight of stannous halide, 1 to 2.5 parts by weight of the metal salt, 0.02 to 0.2 parts by weIght of the cadmium salt, and in which the dyestuff is present in an amount within the range of 0.05 to 0.1 percent by weight.
Claim 8
Dependent Claim
17 words
An offset master as claimed in claim 5 in which the materials are present in separate coatings.
References Cited (Backward Citations)
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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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |