Patent US3458752A successfully refreshed from Google Patents.
US3458752A
Expired / Lapsed
US
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Method and apparatus for improving the performance of electrostatic printing tubes
Assignee: Unisys Corp
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Filing: 1965-04-02
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Granted: 1969-07-29
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Expires: 1985-04-02
Abstract
No abstract record available.
Inventors
- 👤 Philip A Stowell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:00
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)
US2951176A
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US2948830A
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US3110764A
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US2931937A
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US3040124A
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US2879442A
Cited
US2978607A
Cited
US3089055A
Cited
US3234561A
Cited
US3242261A
Cited
US3213316A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-28 | 1973-01-27 | 1973-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-28 | 1977-01-27 | 1977-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-28 | 1981-01-27 | 1981-07-29 | $7700.00 | Window Closed / Lapsed |