Patent US2928973A successfully refreshed from Google Patents.
US2928973A
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US
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Electrostatic printing tube and method for manufacture
Assignee: AB Dick Co
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Filing: 1957-10-21
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Granted: 1960-03-15
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Expires: 1977-10-21
Abstract
No abstract record available.
Inventors
- 👤 Robert W Crews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:54
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/02; H01J31/06; H01J31/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2273793A
Cited
US2467734A
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US2495042A
Cited
US2810186A
Cited
US2795840A
Cited
US2818523A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |