US3999481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making a master
Assignee: Xerox Corp
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Filing: 1974-11-15
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Granted: 1976-12-28
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Expires: 1994-11-15
Abstract
Abstract A master is formed on a photoconductive surface by first forming an electrostatic charge pattern on the imaging member and developing the charge pattern to form an image of electroscopic marking particles. The developed image is uniformly coated with a thin layer of an adhesive coating and the coated image is then contacted with an adhesive surface transfer element. Upon separation the thin layer of adhesive overcoating fractures. The thin overcoating over the electroscopic particles and these particles transfer to the transfer element so as to leave on the photoconductive member the remaining thin overcoating layer in an image configuration which constitutes the master.
Inventors
- 👤 Joseph G. Sankus, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:23
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/26; G03G13/28; G03G13/283; G03G13/32
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
118 words
A method of forming a master on a photoconductive surface comprising: a. forming an electrostatic charge pattern on the surface of a photoconductive imaging member; b. applying a xerographic developer to said member bearing the charge pattern to form an image composed of electroscopic marking particles; c. uniformly coating said particles and said member with a thin layer of an adhesive coating; d. contacting said coated member with an adhesive surface transfer element and separating said transfer element whereby the thin layer of adhesive overcoating fractures with the electroscopic particles and the associated overcoating being transferred to the transfer element to leave remaining on the photoconductive member said thin layer in the noimage areas to form a master.
Claim 2
Independent Claim
118 words
A method of forming a master on a photoconductive surface comprising: a. forming an electrostatic charge pattern on the surface of a photoconductive imaging member; b. applying a xerographic developer to said member bearing the charge pattern to form an image composed of electroscopic marking particles; c. uniformly coating said particles and said member with a thin layer of an adhesive coating; d. contacting said coated member with an adhesive surface transfer element and separating said transfer element whereby the thin layer of adhesive overcoating fractures with the electroscopic particles and the associated overcoating being transferred to the transfer element to leave remaining on the photoconductive member said thin layer in the noimage areas to form a master.
Claim 3
Dependent Claim
24 words
The method of claim 1, wherein said thin layer of an adhesive coating has a thickness of from about 5 to about 25 microns.
Claim 4
Dependent Claim
17 words
The method of claim 1, wherein the coating material of step (c) comprises polyisobutylene and a surfactant.
Claim 5
Dependent Claim
22 words
The process of claim 3, wherein said thin layer of polyisobutylene has a thickness of from about 5 to about 25 microns.
Claim 6
Dependent Claim
16 words
The method of claim 1, wherein said electrostatic charge pattern is developed with a liquid developer.
Claim 7
Dependent Claim
19 words
The method of claim 5, wherein said liquid developer comprises cyclized rubber and carbon black suspended in a solvent.
Claim 8
Dependent Claim
17 words
The method of claim 1, wherein said adhesive surface transfer element has a surface composed of polyester.
Claim 9
Dependent Claim
25 words
The method of claim 1, wherein said thin layer of adhesive coating has an electrical resistivity in the order of 10 ohm cm or greater.
Claim 10
Dependent Claim
23 words
The method of claim 1, wherein the contacting of step (d) is done at a nip pressure of approximately 5 lbs. or higher.
Claim 11
Dependent Claim
13 words
The method of claim 1, wherein said adhesive surface transfer element is transparent.
Claim 12
Dependent Claim
18 words
A process according to claim 1, wherein said master is employed to make additional copies on receiving sheets.
Claim 13
Dependent Claim
30 words
A method according to claim 11, wherein said master is charged and exposed to light, developed with an electroscopic developer and the developed image is transferred to a receiving sheet.
Claim 14
Dependent Claim
31 words
A method according to claim 11, wherein said master is wetted with an aqueous fountain solution, inked with a lithographic ink and the sheet image is transferred to a receiving sheet.
Claim 15
Dependent Claim
42 words
A method according to claim 11, wherein said master is employed as a gravure printing element by loading the depressed areas between the remaining thin layer of said adhesive coating with ink and transferring the ink image pattern to a receiving sheet.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |