US3620722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sensitized developers for electrophotography and electroradiography
Assignee: SUPPLY AUSTRALIA
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Filing: 1968-09-18
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Granted: 1971-11-16
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Expires: 1988-09-18
Abstract
Abstract The invention relates to a method of correcting the surface of a photoconductor during multicolor development processes wherein the sensitivity to color acceptance during exposure is varied by the developer of the previous steps, the invention residing in the color correction between development and exposure steps of either the whole surface or the image surface only by either including with a developer, or applying independently, a sensitizing dye in the next color exposure.
Inventors
- 👤 Peter J Hastwell
- 👤 Kenneth A Metcalfe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:25
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/01; G03G13/013; G03G13/0131; G03G5/00; G03G5/02; G03G5/04; G03G5/09; G03G5/12; G03G9/00; G03G9/08; G03G9/09; G03G9/0906; G03G9/0912; G03G9/0914; G03G9/0918; G03G9/092; G03G9/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
104 words
The method of claim 1 wherein the electrophotographic surface is sensitized for red, green and blue light, and comprising the following steps; effecting a first exposure through a filter to expose one of said colors, developing the thus formed latent electrostatic image by means of liquid developer of complementary color containing a correcting dye for the second exposure, effecting the said second image exposure through a filter of the required color, developing same with a complementary liquid developer containing a correcting dye for the next exposure, effecting a further exposure for the remaining color, and developing same with a liquid developer of complementary color.
References Cited (Backward Citations)
US3060020A
Cited
US3337340A
Cited
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 |