US3714665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic recording with improved electrostatic charge retention
Assignee: Xerox Corp
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Filing: 1970-01-28
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Granted: 1973-01-30
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Expires: 1990-01-28
Abstract
Abstract Method and apparatus for electrostatic recording on ordinary paper. An electrostatic latent charge pattern to be developed is deposited on dry ordinary paper. A conductive member is positioned in contact with the other surface of the paper from the point of charge deposition to the development area. The electrostatic latent charge pattern is then developed in the development area.
Inventors
- 👤 E Mutschler
- 👤 U Klavsons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:26
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/321; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
83 words
Apparatus for recording electrostatic charge images on a substrate of ordinary paper comprising: a. means for developing an electrostatic charge image formed on a substrate of ordinary paper, b. means for depositing an electrostatic charge image on said ordinary paper substrate, said depositing means being positioned to receive said ordinary paper substrate prior to said developing means, and c. an electrically conductive electrode in contact with said ordinary paper substrate on the side opposite said depositing means and extending to said developing means.
Claim 2
Dependent Claim
83 words
Apparatus for recording electrostatic charge images on a substrate of ordinary paper comprising: a. means for developing an electrostatic charge image formed on a substrate of ordinary paper, b. means for depositing an electrostatic charge image on said ordinary paper substrate, said depositing means being positioned to receive said ordinary paper substrate prior to said developing means, and c. an electrically conductive electrode in contact with said ordinary paper substrate on the side opposite said depositing means and extending to said developing means.
Claim 3
Dependent Claim
17 words
The apparatus as defined in claim 1 wherein said electrically conductive electrode extends into said developing means.
Claim 4
Dependent Claim
42 words
The apparatus as defined in claim 1 further including means to enclose said paper between said depositing means and said developing means in a chamber containing a desiccant whereby the dissipation of said deposited electrostatic charges prior to being developed is minimized.
Claim 5
Dependent Claim
70 words
The apparatus as defined in claim 1 further including means to apply a conductive liquid to the backside of said paper to wet said paper part way through prior to depositing said electrostatic charge on said paper, said liquid applicator means being positioned with respect to said depositing means and developing means so that said liquid has time to migrate only part way through said paper prior to image development.
Claim 6
Dependent Claim
18 words
The apparatus as defined in claim 1 wherein said electrically conductive electrode comprises a rotatable grounded metallic drum.
Claim 7
Dependent Claim
60 words
The apparatus as defined in claim 1 wherein said developing means comprises a pair of opposed parallel plate electrodes separated by insulating members, said plate electrodes and said insulating means forming a chamber-like structure containing development powder and biasing means for applying an electrical field across said paper and powder as said image carrying paper passes through said chamber-like structure.
Claim 8
Dependent Claim
15 words
The apparatus of claim 1 wherein said electrically conductive electrode comprises a flexible conductive belt.
Claim 9
Dependent Claim
15 words
The apparatus as defined in claim 1 wherein said depositing means comprises a contact stylus.
Claim 10
Dependent Claim
33 words
The apparatus as defined in claim 8, said contact stylus produces a pressure on said paper in the range from about 2,000 pounds per square inch to about 3,500 pounds per square inch.
Claim 11
Dependent Claim
27 words
The apparatus as defined in claim 1 further including a means for drying said paper positioned along the path of paper flow prior to said depositing means.
Claim 12
Dependent Claim
27 words
The apparatus of claim 10 wherein said drying means further includes means to fuse the developed image following the passage of said paper through said developing means.
Claim 13
Independent Claim
56 words
A method of recording electrostatic charge images on a substrate of ordinary paper comprising the steps of: a. depositing electrostatic charge images on said ordinary paper substrate, and b. providing an electrically conductive electrode in contact with said ordinary paper substrate from the time said electrostatic charge images are deposited thereon until said images are developed.
Claim 14
Independent Claim
56 words
A method of recording electrostatic charge images on a substrate of ordinary paper comprising the steps of: a. depositing electrostatic charge images on said ordinary paper substrate, and b. providing an electrically conductive electrode in contact with said ordinary paper substrate from the time said electrostatic charge images are deposited thereon until said images are developed.
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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |