US3793205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chargeless developer
Assignee: COMMONWEALTH AU
•
Filing: 1971-08-05
•
Granted: 1974-02-19
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Expires: 1991-08-05
Abstract
Abstract An improved developer for xerographic surfaces in which an image is produced without an applied charge, in which a controlled developer pigment of one polarity is suspended in an insulating carrier liquid, and a second developer medium also capable of acting as a developer, but of opposite polarity and incapable of wetting the first pigment, is used to enhance deposition of the first pigment in image areas and to shield the non-image areas against deposition of the first developer.
Inventors
- 👤 K Metcalfe
- 👤 W Lowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:09
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3081263A
Cited
US3032432A
Cited
US3078231A
Cited
US3300410A
Cited
US3392018A
Cited
US3383316A
Cited
US3391015A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |