US3117891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xerographic apparatus
Assignee: Xerox Corp
•
Filing: 1960-09-26
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Granted: 1964-01-14
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Expires: 1980-09-26
Abstract
No abstract record available.
Inventors
- 👤 Ernest H Lehmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:34
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0801
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
XEROGRAPHIC APPARATUS COMPRISING A CYLINDRICAL XEROGRAPHIC DRUM, MEANS TO ROTATE SAID DRUM, MEANS TO FORM ON THE SURFACE OF SAID DRUM AND ELECTROSTATIC LATENT IMAGE, DEVELOPER FEED MEANS POSITIONED TO FLOW A CASCADE DEVELOPER MATERIAL DOWNWARD ACROSS THE DRUM SURFACE AT A POINT ALONG SAID DRUM FOLLOWING IMAGE FORMATION, A CYLINDRICAL MAGNET POSITIONED PARAXIALLY WITH SAID DRUM AND WITHIN SAID DRUM ADJACENT TO A DRUM SEGMENT ACROSS WHICH DEVELOPER FLOWS, AND MEANS TO ROTATE SAID CYLINDRICAL MAGNET IN A DIRECTION OPPOSITE TO THE DIRECTION OF MOVEMENT OF SAID CYLINDRICAL DRUM.
Claim 2
Dependent Claim
90 words
XEROGRAPHIC APPARATUS COMPRISING A CYLINDRICAL XEROGRAPHIC DRUM, MEANS TO ROTATE SAID DRUM, MEANS TO FORM ON THE SURFACE OF SAID DRUM AND ELECTROSTATIC LATENT IMAGE, DEVELOPER FEED MEANS POSITIONED TO FLOW A CASCADE DEVELOPER MATERIAL DOWNWARD ACROSS THE DRUM SURFACE AT A POINT ALONG SAID DRUM FOLLOWING IMAGE FORMATION, A CYLINDRICAL MAGNET POSITIONED PARAXIALLY WITH SAID DRUM AND WITHIN SAID DRUM ADJACENT TO A DRUM SEGMENT ACROSS WHICH DEVELOPER FLOWS, AND MEANS TO ROTATE SAID CYLINDRICAL MAGNET IN A DIRECTION OPPOSITE TO THE DIRECTION OF MOVEMENT OF SAID CYLINDRICAL DRUM.
References Cited (Backward Citations)
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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) | 1967-01-13 | 1967-07-15 | 1968-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-13 | 1971-07-15 | 1972-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-13 | 1975-07-15 | 1976-01-14 | $7700.00 | Window Closed / Lapsed |