Patent US3743682A successfully refreshed from Google Patents.
US3743682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
An electrophotographic developer composition containing boron nitride
Assignee: International Business Machines Corp
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Filing: 1971-10-12
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Granted: 1973-07-03
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Expires: 1991-10-12
Abstract
Abstract Wetting by toners of the surface of reusable photoconductors in electrophotographic processes results on image cycling in adhesion of the toner to the photoconductor surface to form a film. Such filming is reduced or eliminated by introducing into the system a small amount of boron nitride.
Inventors
- 👤 W Crooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:29
CPC Classifications
G; G03; G03G; G03G8/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
22 words
A composition as claimed in claim 1 which also contains carrier beads which are grossly larger than said finely divided toner particles.
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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |