Patent US3620798A successfully refreshed from Google Patents.
US3620798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Development of latent electrostatic image employing novel development electrode
Assignee: Fujifilm Holdings Corp
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Filing: 1968-01-16
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Granted: 1971-11-16
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Expires: 1988-01-16
Abstract
Abstract A process of developing a latent electrostatic image, which comprises facing across a small clearance an insulator having a latent electrostatic image and another insulator for electric field regulating, having the same polaity as said insulator, uniform charges and characteristics substantially similar to the dark attenuation characteristics of said insulator under the developing condition, and feeding developing particles having the same polairity as that of said latent electrostatic image to the clearance, whereby to develop said latent electrostatic image.
Inventors
- 👤 Satoru Honjo
- 👤 Yasuo Tamai
- 👤 Masamichi Sato
- 👤 Seiji Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:11
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
65 words
A process as in claim 1 where said another insulator is photoconductive and including the step of uniformly exposing said another insulator to light so that said electric field emanating from the uniform charges of said another insulator is substantially equal to or less than said electric field emanating from the area of maximum charge density of said latent electrostatic image of said photoconductive insulator.
Claim 2
Dependent Claim
49 words
A process as in claim 1 including the step of first transferring said latent electrostatic image to a further insulator having dark attenuation characteristics substantially similar to those of said another insulator and then reversely developing said latent electrostatic image in accordance with the remaining steps of claim 1.
Claim 3
Dependent Claim
12 words
A process as in claim 1 where said another insulator is photoconductive.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |