US3909254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser recording method
Assignee: Xerox Ltd
•
Filing: 1973-03-19
•
Granted: 1975-09-30
•
Expires: 1993-03-19
Abstract
Abstract A novel electrophotographic imaging system employing persistent conductivity materials is disclosed. Laser radiation is utilized with subsequent charging and developing to provide sharp clear reproductions of an original. A two color process employing one developer is also disclosed.
Inventors
- 👤 Yasuo Tamai
- 👤 Masaaki Takimoto
- 👤 Akira Nahara
- 👤 Masamichi Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:16
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/267; G; G03; G03G; G03G17/00; G03G5/00; G03G5/02; G03G5/024; G03G5/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
46 words
AN ELECTROPHOTOGRAPHIC IMAGING PROCESS COMPRISING PROVIDING A PHOTOCONDUCTIVE MATERIAL HAVING PERSISTENT CONDUCTIVITY PROPERTIES SUCH THAT AFTER SAID MATERIAL IS IRRADICATED WITH ACTINIC RADIATION CONDUCTIVITY IN THE EXPOSED AREAS TEMPORARILY PERSISTS, IRRADIATING SAID MATERIAL WITH A LESASER BEAM IMAGE-WISE, UNIFORMITY CHARGING SAID MATERIAL AND DEVELOPING SAID MATERIAL.
Claim 2
Dependent Claim
46 words
AN ELECTROPHOTOGRAPHIC IMAGING PROCESS COMPRISING PROVIDING A PHOTOCONDUCTIVE MATERIAL HAVING PERSISTENT CONDUCTIVITY PROPERTIES SUCH THAT AFTER SAID MATERIAL IS IRRADICATED WITH ACTINIC RADIATION CONDUCTIVITY IN THE EXPOSED AREAS TEMPORARILY PERSISTS, IRRADIATING SAID MATERIAL WITH A LESASER BEAM IMAGE-WISE, UNIFORMITY CHARGING SAID MATERIAL AND DEVELOPING SAID MATERIAL.
Claim 3
Dependent Claim
20 words
The method as defined in claim 1 wherein said laser is employed at an energy level not lower than 102W-cm.
Claim 4
Dependent Claim
23 words
The method as defined in claim 1 Wherein said photoconductive material is selected from the group consisting of zinc oxide and titanium dioxide.
Claim 5
Dependent Claim
42 words
The method as defined in claim 1 wherein said photoconductive material comprises a photoconductive material dispersed in a resin said resin being selected from the group consisting of polyvinylchloride, polyvinylidene chloride-polyvinylidene chloride copolymers, polyvinyl chloride polyvinylacetate copolymers, chlorinated polypropylene, and chlorinated rubber.
Claim 6
Dependent Claim
18 words
The process as defined in claim 1 wherein said laser radiation is performed in the absence of light.
Claim 7
Dependent Claim
14 words
The process as defined in claim 1 wherein said irradiation is performed in daylight.
Claim 8
Dependent Claim
95 words
An electrophotographic imaging process comprising providing a photoconductive material having persistent photoconductivity properties such that after said material is exposed to actinic radiation the irradiated areas retain their conductivity, irradiating said material with a laser beam at a sufficient energy level so as to partially blacken the surface of said material imagewise, charging said material uniformly resulting in the formation of a latent electrostatic image on the surface thereof in the unblackened areas and developing said image by applying a non-black toner material having a charge opposite to the charge of said latent electrostatic image.
Claim 9
Dependent Claim
95 words
An electrophotographic imaging process comprising providing a photoconductive material having persistent photoconductivity properties such that after said material is exposed to actinic radiation the irradiated areas retain their conductivity, irradiating said material with a laser beam at a sufficient energy level so as to partially blacken the surface of said material imagewise, charging said material uniformly resulting in the formation of a latent electrostatic image on the surface thereof in the unblackened areas and developing said image by applying a non-black toner material having a charge opposite to the charge of said latent electrostatic image.
Claim 10
Dependent Claim
14 words
The process as defined in claim 1 wherein said laser is a helium-neon laser.
Claim 11
Dependent Claim
14 words
The process as defined in claim 1 wherein said laser is a ruby laser.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |