US3719481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatographic imaging process
Assignee: Xerox Corp
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Filing: 1971-03-04
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Granted: 1973-03-06
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Expires: 1991-03-04
Abstract
Abstract An electrically insulating web is charged on a first side with an electrostatic charge of one polarity and charged on a second side with an electrostatic charge of a second polarity. The first side of the web is brought into contact with a photoconductive layer and the layer is then exposed to a light pattern. The second side of the web is subjected to ions having a polarity of charge opposite to the polarity of charge on the second side. The resulting electrostatic latent image formed on the second side of the web may be developed with electroscopic toner particles.
Inventors
- 👤 T Nagashima
- 👤 K Makino
- 👤 A Yoshikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:31
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/226; G03G15/227; G03G13/00; G03G13/22; G03G13/24; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/102
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
165 words
An electrostatographic imaging process which comprises: a. providing a transparent or opaque insulating web of a thickness in the range of from about 10 to about 100 microns having an imaging surface and a rear surface; b. charging one of the surfaces of said web with an electrostatic charge of one polarity and the other surface of said web with an electrostatic charge of the opposite polarity; c. contacting at least a portion of the rear surface of the insulating web with one surface of a photoconductive layer, the opposite surface of said photoconductive layer being in intimate contact with a grounded electrically conductive member at the point of contact of the rear surface of the web and the photoconductive layer; and d. exposing the portion of said photoconductive layer in contact with the web with a light pattern while simultaneously subjecting said imaging surface of the web to ions having a polarity of charge opposite of the polarity of charge on said imaging surface.
Claim 2
Dependent Claim
165 words
An electrostatographic imaging process which comprises: a. providing a transparent or opaque insulating web of a thickness in the range of from about 10 to about 100 microns having an imaging surface and a rear surface; b. charging one of the surfaces of said web with an electrostatic charge of one polarity and the other surface of said web with an electrostatic charge of the opposite polarity; c. contacting at least a portion of the rear surface of the insulating web with one surface of a photoconductive layer, the opposite surface of said photoconductive layer being in intimate contact with a grounded electrically conductive member at the point of contact of the rear surface of the web and the photoconductive layer; and d. exposing the portion of said photoconductive layer in contact with the web with a light pattern while simultaneously subjecting said imaging surface of the web to ions having a polarity of charge opposite of the polarity of charge on said imaging surface.
Claim 3
Dependent Claim
14 words
An electrostatographic imaging process according to claim 1 wherein said insulating web is transparent.
Claim 4
Dependent Claim
14 words
An electrostatographic imaging process according to claim 1 wherein said insulating web is opaque.
Claim 5
Dependent Claim
21 words
An electrostatographic imaging process according to claim 1 wherein said light pattern is projected through said web onto said photoconductive layer.
Claim 6
Dependent Claim
38 words
An electrostatographic imaging process according to claim 1 wherein said photoconductive layer is supported on an electrically conductive surface of a transparent substrate and said light pattern is projected through said transparent substrate onto an opaque insulating web.
Claim 7
Dependent Claim
23 words
An electrostatographic imaging process according to claim 1 wherein the dark resistivity of said photoconductive layer is less than about 105 ohm cms.
Claim 8
Dependent Claim
34 words
An electrostatographic imaging process according to claim 1 including developing said electrostatic latent image with toner particles whereby a toner image in conformance with said electrostatic latent image is formed on said imaging surface.
Claim 9
Dependent Claim
41 words
An electrostatographic imaging process according to claim 1 wherein the Mu . Tau value of the free electrons in said photoconductive layer is greater than that of the free holes and said imaging surface is initially charged to a positive polarity.
Claim 10
Dependent Claim
41 words
An electrostatographic imaging process according to claim 1 wherein the Mu . Tau value of the free electrons in said photoconductive layer is greater than that of the free holes and said imaging surface is initially charged to a negative polarity.
Claim 11
Dependent Claim
25 words
An electrostatographic imaging process according to claim 1 wherein said electrically insulating web has a capacitance substantially equal to the capacitance of said photoconductive layer.
Claim 12
Dependent Claim
56 words
An electrostatic imaging process according to claim 1 wherein the charge density on said imaging surface after said charging of said imaging surface with an electrostatic charge of one polarity is substantially equal to the charge density on said rear surface after said charging of said rear surface with an electrostatic charge of a second polarity.
Claim 13
Dependent Claim
37 words
An electrostatic imaging process according to claim 1 wherein said insulating web is substantially simultaneously exposed to said light pattern and subjected to ions of a polarity opposite to the polarity of charge on said imaging surface.
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) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |