US2933639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency shifting apparatus
Assignee: Unisys Corp
•
Filing: 1956-12-06
•
Granted: 1960-04-19
•
Expires: 1976-12-06
Abstract
No abstract record available.
Inventors
- 👤 Philip M Lally
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:46
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/34; H01J25/36; H01J25/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2584308A
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US2630544A
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US2584597A
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US2683238A
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US2725499A
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US2608668A
Cited
DE898635C
Cited
US2760161A
Cited
US2832001A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-19 | 1963-10-19 | 1964-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-19 | 1967-10-19 | 1968-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-19 | 1971-10-19 | 1972-04-19 | $7700.00 | Window Closed / Lapsed |