US3707390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for developing electrostatic latent images
Assignee: Xerox Corp
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Filing: 1971-01-12
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Granted: 1972-12-26
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Expires: 1991-01-12
Abstract
Abstract A METHOD IS PROVIDED FOR THE DEVELOPMENT OF ELECTROSTATIC LATENT IMAGES FORMED ON A SUPPORT MEMBER. MAGNETIC TONER PARTICLES ARE MAGNETICALLY DRAWN OVER A NONMAGNETIC SURFACE, WHILE ON SAID SURFACE A CHARGE IS APPLIED TO THE TONER PARTICLES WHICH IS OPPOSITE IN POLARITY TO THAT OF THE ELECTROSTATIC LATENT IMAGE. A STREAM OF GASEOUS MATERIAL IS DIRECTED AGAINST THE CHARGE TONER PARTICLES CARRIED ON THE NON-MAGNETIC SURFACE TO FORM A SUSPENSION OF SAID PARTICLES IN SAID GASEOUS MATERIAL. THIS SUSPENSION, OR POWDER CLOUD, IS CONTACTED WITH SAID ELECTROSTATIC LATENT IMAGE TO THEREBY DEVELOP SAID IMAGE WITH SAID TONER PARTICLES.
Inventors
- 👤 William A Sullivan Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:11
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0803
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |