US3986874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Driographic imaging method
Assignee: Xerox Corp
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Filing: 1974-10-23
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Granted: 1976-10-19
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Expires: 1994-10-23
Abstract
Abstract The present invention is a driograhic imaging method which employs an ink comprised of an organic material which is convertible from a state of high viscosity to a state of low viscosity by exposure to high energy radiation. The ink is applied to an inking roller in its initial state of high viscosity and exposed to activating radiation in an imagewise manner to convert the material to a state of low viscosity and thereby reduce the viscosity of the ink in a configuration corresponding to the pattern of radiation. Contacting the irradiated inking roller with a receiving member results in transfer of the ink in imagewise configuration from the inking roller to the receiving member.
Inventors
- 👤 Dana G. Marsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:16
CPC Classifications
B; B41; B41M; B41M1/00; B41M1/06; B41M1/08; G; G03; G03F; G03F7/00; G03F7/004; G03F7/039; G03F7/26; G03F7/34; G03F7/343; Y; Y10; Y10S; Y10S430/00; Y10S430/148; Y10S430/15
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
204 words
A driographic imaging method which comprises: a. providing an inking roller in the form of a supporting substrate whose periphery is at least partially arcuate having uniformly distributed on its surface a film of an ink comprised of an organic photoactive material in a state of high viscosity, said material being selected from those compositions which are convertible to a state of low viscosity by exposure to a high energy activating electromagnetic radiation; b. rotating the inking roller at a velocity at which the adhesion of the ink to the inking roller and cohesive forces between the ink particles are greater than the adhesion between the ink and a receiving member in contact with the inking roller at an arcuate area on its periphery; and c. exposing the ink film to activating electromagnetic radiation in imagewise fashion to reduce the viscosity of the ink in the exposed areas thereby reducing the adhesion of the ink to the inking roller and the cohesive forces between the ink particles and causing it to transfer to the receiving member in imagewise configuration corresponding to the pattern of activating radiation upon contacting an arcuate portion of the inking roller with the receiving member and providing relative motion therebetween.
Claim 2
Dependent Claim
204 words
A driographic imaging method which comprises: a. providing an inking roller in the form of a supporting substrate whose periphery is at least partially arcuate having uniformly distributed on its surface a film of an ink comprised of an organic photoactive material in a state of high viscosity, said material being selected from those compositions which are convertible to a state of low viscosity by exposure to a high energy activating electromagnetic radiation; b. rotating the inking roller at a velocity at which the adhesion of the ink to the inking roller and cohesive forces between the ink particles are greater than the adhesion between the ink and a receiving member in contact with the inking roller at an arcuate area on its periphery; and c. exposing the ink film to activating electromagnetic radiation in imagewise fashion to reduce the viscosity of the ink in the exposed areas thereby reducing the adhesion of the ink to the inking roller and the cohesive forces between the ink particles and causing it to transfer to the receiving member in imagewise configuration corresponding to the pattern of activating radiation upon contacting an arcuate portion of the inking roller with the receiving member and providing relative motion therebetween.
Claim 3
Dependent Claim
29 words
The method of claim 1 wherein an offset roller is employed as the receiving member and the ink is transferred from the offset roller to a second receiving member.
Claim 4
Dependent Claim
31 words
The method of claim 1 wherein the portion of the drum exposed to activating radiation is passed through an inking vessel subsequent to transfer to the image to the receiving member.
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein the inking roller is cylindrical in configuration.
Claim 6
Dependent Claim
11 words
The method of claim 1 wherein the receiving member is paper.
Claim 7
Dependent Claim
48 words
The method of claim 1 wherein the photoactive material is a macromolecule having bound to it charged azo type moieties in the trans form which upon irradiation convert to the cis form, thereby allowing the polymer to relax to the coiled configuration and undergo a decrease in viscosity.
Claim 8
Dependent Claim
36 words
The method of claim 1 wherein the photoactive material is a photodegradable polymer and the ink contains a photoactive agent capable of causing degradation of the polymer upon exposure to electromagnetic radiation of the proper wavelength.
Claim 9
Dependent Claim
77 words
The method of claim 7 wherein the photodegradable polymer is a polymeric composition containing segments characterized by the structural formula: ##STR3## wherein R 1 is hydrogen or methyl and R 2 is hydrogen, an alkyl radical of 1 to 6 carbon atoms, a chlorinated or fluorinated aliphatic radical of 1 to 6 carbon atoms or a cyano substituted radical of 1 to 5 carbon atoms provided that when R 1 is methyl, R 2 is also methyl.
Claim 10
Dependent Claim
45 words
The method of claim 7 wherein the photoactive agent is a composition which upon activation is capable of abstracting an H atom from the polymer backbone thereby forming a free radical species on a carbon atom and R 1 in the foregoing formula is hydrogen.
Claim 11
Dependent Claim
33 words
The method of claim 7 wherein the photoactive agent is a photo-oxidant which upon activation is capable of abstracting one or more electrons from one or more oxygen atoms of the degradable polymer.
Claim 12
Dependent Claim
37 words
The method of claim 7 wherein the photoactive material is a homopolymer characterized by the formula: ##STR4## wherein R 1 and R 2 are as defined above and n is a number representing the degree of polymerization.
Claim 13
Dependent Claim
18 words
The method of claim 1 wherein the photoactive material is combined with a coloring agent and a solvent.
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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) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |