US2777957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corona discharge device
Assignee: Xerox Corp
•
Filing: 1950-04-06
•
Granted: 1957-01-15
•
Expires: 1970-04-06
Abstract
No abstract record available.
Inventors
- 👤 Lewis E Walkup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:37
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0291; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/102
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US940430A
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US904429A
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US1782712A
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US2143214A
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US2058732A
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DE699025C
Cited
US2333213A
Cited
US2377391A
Cited
US2551582A
Cited
US2497604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |