Patent US1830578A successfully refreshed from Google Patents.
US2598732A
Expired / Lapsed
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Electrophotography
Assignee: Xerox Corp
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Filing: 1949-03-09
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Granted: 1952-06-03
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Expires: 1969-03-09
Abstract
No abstract record available.
Inventors
- 👤 Lewis E Walkup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:41
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/04027; G03G15/22; G03G15/26; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 0
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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) | 1955-06-03 | 1955-12-03 | 1956-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-03 | 1959-12-03 | 1960-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-03 | 1963-12-03 | 1964-06-03 | $7700.00 | Window Closed / Lapsed |