Patent US3557751A successfully refreshed from Google Patents.
US3557751A
Expired / Lapsed
US
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Device for dry development in electrophotography
Assignee: Minolta Co Ltd
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Filing: 1968-05-16
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Granted: 1971-01-26
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Expires: 1988-05-16
Abstract
Abstract An electrophotographic developing device using developing powder containing a toner and a carrier, which developing powder is applied to each photosensitive paper being developed by a magnetic developing roller. The magnetic developing roller consists of a plurality of sliced permanent magnets with spacers inserted between adjacent magnets. The sliced permanent magnets facilitate formation of magnetic brush ears of the developing powder on the peripheral surface of the magnetic developing roller, so as to insure even distribution of said developing powder over the entire span of the photosensitive paper.
Inventors
- 👤 Teizo Kushima
- 👤 Masaya Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:40
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0921; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |