US3685907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic process
Assignee: Individual
•
Filing: 1970-06-25
•
Granted: 1972-08-22
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Expires: 1990-06-25
Abstract
Abstract An electrophotographic process comprising forming an electrostatic latent image on a photoconductive insulating coating and developing said latent image by liquid development where the photoconductive coating and a development electrode are brought into direct contact with each other during development. The coating and/or the development electrode have uniform surface irregularities of very fine structure such that the directly contacted area of the coating with the electrode does not exceed 10 percent of the whole area of the processed surface to be developed where the majority of the contact points having a representative size not greater than 50 microns. The two surfaces undergo no movement during the contact.
Inventors
- 👤 Masamichi Sato
- 👤 Osamu Fukushima
- 👤 Hajime Miyazuka
- 👤 Masaaki Takimoto
- 👤 Seiji Matsumoto
- 👤 Yasuo Tamai
- 👤 Satoru Honjo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:43
CPC Classifications
G; G03; G03G; G03G8/00; G03G15/00; G03G15/06; G03G15/10; G03G5/00; G03G5/10; G03G5/101; G03G9/00; G03G9/08; G03G9/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
23 words
A process as in claim 1 where the majority of said contact points are separated from each other by 100 to 400 microns.
Claim 2
Dependent Claim
6 words
providing an electrically conductive development electrode;
Claim 3
Dependent Claim
10 words
fOrming an electrostatic latent image on said photoconductive insulating layer;
Claim 4
Dependent Claim
29 words
A process as in claim 1 where the density of said points of contact which have a diameter greater than 100 microns does not exceed 5 per square centimeter.
Claim 5
Dependent Claim
16 words
A process as in claim 3 where said density does not exceed 2 per square centimeter.
Claim 6
Dependent Claim
80 words
moving said photoconductive insulating layer by said development electrode in such a manner that the surfaces of said photoconductive insulating layer and said development electrode (a) undergo no relative movement and (b) directly contact one another at no more than 10 percent of the whole area of the processed surface to be developed of said photoconductive insulating layer where the majority of the points of contact are substantially uniformly distributed and have a diameter not greater than 50 microns; and
Claim 7
Dependent Claim
90 words
developing said electrostatic latent image by introducing developing liquid containing charged toner particles between said development electrode and said photoconductive insulating layer so that said developing liquid contacts said photoconductive insulating layer at both the image and non-image areas thereof whereby said toner particles are attracted only to the electrostatic latent image areas to thereby effect the reproduction of line and continuous tone images whereby the edge effect in the reproduced image is substantially minimized because of the said direct contact between the photoconductive insulating layer and the development electrode.
Claim 8
Dependent Claim
31 words
A process as in claim 1 where said contact points directly contact one another at no more than 3 percent of the whole area of the processed surface to be developed.
Claim 9
Dependent Claim
25 words
A process as in claim 1 where the surface of said photoconductive insulating layer is smooth and the surface of said development electrode is rough.
Claim 10
Dependent Claim
21 words
A process as in claim 1 where both the surfaces of said photoconductive insulating layer and said development electrode are rough.
Claim 11
Dependent Claim
25 words
A process as in claim 1 where the surface of said photoconductive insulating layer is rough and the surface of said development electrode is smooth.
Claim 12
Dependent Claim
15 words
A process as in claim 1 where said development electrode comprises at least one roller.
Claim 13
Dependent Claim
16 words
A process as in claim 1 where said development electrode comprises at least one endless belt.
References Cited (Backward Citations)
CA801687A
Cited
US3084043A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |