US3816115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming a plurality of electrostatic latent images on an electrophotographic plate
Assignee: Xerox Corp
•
Filing: 1971-08-25
•
Granted: 1974-06-11
•
Expires: 1991-08-25
Abstract
Abstract A plurality of electrostatic latent images are formed on the surface of an electrophotographic plate having an electrically insulating overcoating by a method comprising the steps of charging the plate to a uniform surface potential, exposing to a first image pattern, recharging the plate to restore the uniform surface potential and subsequently exposing to a second image pattern. The latent images can be developed with an electroscopic marking material to form visible powder images which can be fixed to the plate or transferred to a recording medium and fixed thereon.
Inventors
- 👤 R Gundlach
- 👤 L Bean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:06
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/14; G03G5/147; G03G5/14708; G03G5/14713; G03G5/14717; G03G5/14726; G03G13/00; G03G13/22; G03G5/14721; G03G5/14747; G03G5/14752
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
24 words
The method as defined in claim 1 and further including the step of developing said electrostatic latent images by depositing electroscopic marking particles thereon.
Claim 2
Dependent Claim
21 words
The method as defined in claim 2 and further including the step of fixing said developed images to said xerographic member.
Claim 3
Dependent Claim
27 words
The method as defined in claim 2 and further including the steps of transferring said developed images to a receiver material and fixing said developed images thereto.
Claim 4
Dependent Claim
31 words
The method as defined in claim 1 wherein the insulating film and photoconductive insulating layer of the xerographic member have an electrical thickness relationship of from about 2:1 to about 1:2.
Claim 5
Dependent Claim
28 words
The method as defined in claim 1 wherein the insulating film and the photoconductive insulating layer of the xerographic member have an electrical thickness relationship of about 1:1.
Claim 6
Dependent Claim
18 words
The method as defined in claim 1 whereIn the electrically insulating film is transparent to said activating radiation.
Claim 7
Dependent Claim
17 words
The method as defined in claim 1 wherein the conductive substrate is transparent to said activating radiation.
Claim 8
Dependent Claim
27 words
The method as defined in claim 1 wherein said first and said second electrostatic charges applied to said xerographic member are of opposite polarities from each other.
Claim 9
Dependent Claim
32 words
The method as defined in claim 9 wherein step (b) is carried out by selectively illuminating said charged xerographic member with a pattern of activating radiation corresponding to an original positive image.
Claim 10
Dependent Claim
34 words
The method as defined in claim 9 wherein step (b) is carried out by selectively illuminating said charged xerographic member with a pattern of activating radiation corresponding to at least one original negative image.
Claim 11
Dependent Claim
30 words
The method as defined in claim 11 and further including the step of developing said electrostatic latent images with a development system which develops absolute differences from a reference potential.
Claim 12
Dependent Claim
25 words
The method as defined in claim 1 wherein said first and said second electrostatic charges applied to said xerographic member are of the same polarity.
Claim 13
Dependent Claim
32 words
The method as defined in claim 13 wherein step (b) is carried out by selectively illuminating said charged xerographic member with a pattern of activating radiation corresponding to an original positive image.
Claim 14
Dependent Claim
30 words
The method as defined in claim 14 and further including the step of developing said electrostatic latent images with a development system which develops absolute differences from a reference potential.
Claim 15
Dependent Claim
33 words
The method as defined in claim 13 wherein step (b) is carried out by selectively illuminating said charged xerographic member with a pattern of radiation corresponding to at least one original negative image.
Claim 16
Dependent Claim
39 words
The method as defined in claim 16 and further including the step of developing said electrostatic latent images by depositing thereover electroscopic marking material having a charge of polarity opposite to that of said first and second electrostatic charges.
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |