US3765330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xeroprinting employing letterpress surface covered with a layer of resistive material
Assignee: Xerox Corp
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Filing: 1971-01-06
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Granted: 1973-10-16
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Expires: 1991-01-06
Abstract
Abstract Upon placing an insulating layer into intimate molecular contact with the raised surfaces of a conductive substrate it has been determined that selective discharging will occur when the resulting configuration is exposed to a uniform electrostatic charge such that an electrostatic latent image is produced on the composite member. The system is suitable for forming and developing images in either the charge retaining or discharged areas of the electrically resistive film.
Inventors
- 👤 R Gundlach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:29
CPC Classifications
B; B41; B41M; B41M1/00; B41M1/42; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
163 words
A method of electrostatic printing comprising the steps of: a. providing a printing member comprising a conductive substrate having raised and recessed areas formed of the same material, there being intimately fixed to the surface of the printing member a layer of electrically resistive material, such that the resistive material contacts the surface of the relief areas of the printing member and spans without touching the recessed areas, b. applying a uniform potential of electrostatic charge to the surface of said printing member thereby producing discharge areas where said resistive material contacts said relief areas, and areas which retain charge where said resistive material spans said recessed areas, c. applying a developer composition to the surface of said imaged printing member to form a visible image on the surface thereof, d. contacting said developed printing member with the surface of the transfer sheet, and e. applying an electrostatic field such that the developer particles are transferred to said sheet in an imagewise pattern.
Claim 2
Independent Claim
163 words
A method of electrostatic printing comprising the steps of: a. providing a printing member comprising a conductive substrate having raised and recessed areas formed of the same material, there being intimately fixed to the surface of the printing member a layer of electrically resistive material, such that the resistive material contacts the surface of the relief areas of the printing member and spans without touching the recessed areas, b. applying a uniform potential of electrostatic charge to the surface of said printing member thereby producing discharge areas where said resistive material contacts said relief areas, and areas which retain charge where said resistive material spans said recessed areas, c. applying a developer composition to the surface of said imaged printing member to form a visible image on the surface thereof, d. contacting said developed printing member with the surface of the transfer sheet, and e. applying an electrostatic field such that the developer particles are transferred to said sheet in an imagewise pattern.
Claim 3
Dependent Claim
28 words
A process as disclosed in claim 1 wherein the height differential between the raised and recessed areas of the conductive substrate ranges from about one to five mils.
Claim 4
Dependent Claim
21 words
A process as disclosed in claim 1 wherein said insulating layer has a resistivity of from about 109 to 1014 ohm-centimeters.
Claim 5
Dependent Claim
20 words
The process as disclosed in claim 3 wherein said insulating material has a thickness of at least about 1/4 mil.
Claim 6
Dependent Claim
17 words
The process disclosed in claim 1 wherein steps b through e are repeated at least one time.
Claim 7
Dependent Claim
26 words
The process as disclosed in claim 1 wherein said visible image is developed on the portion of the electrically resistive material which contacts the relief areas.
Claim 8
Dependent Claim
17 words
The process as disclosed in claim 6 wherein said conductive printing member is a letterpress printing plate.
Claim 9
Dependent Claim
26 words
The process as disclosed in claim 1 wherein said visible image is developed on the portion of the electrically resistive material which spans the recessed areas.
Claim 10
Dependent Claim
17 words
The process as disclosed in claim 8 wherein said conductive printing member is a gravure printing plate.
Claim 11
Dependent Claim
23 words
The process as disclosed in claim 7 wherein said recessed areas of said printing member are prefilled with a compressible inelastic foam material.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |