Patent US3472657A successfully refreshed from Google Patents.
US3472657A
Expired / Lapsed
US
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Xerographic development method and apparatus
Assignee: Xerox Corp
•
Filing: 1965-04-30
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Granted: 1969-10-14
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Expires: 1985-04-30
Abstract
No abstract record available.
Inventors
- 👤 Edward F Mayer
- 👤 William A Sullivan Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:29
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/01; G03G15/0105; G03G15/0126; G03G15/06; G03G15/08; G03G15/0801
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2877132A
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US2842456A
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US2910963A
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US2927554A
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US3060020A
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US3084043A
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US3146688A
Cited
US3257223A
Cited
US3232190A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |