Patent US2500945A successfully refreshed from Google Patents.
US2500945A
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US
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Modulator and frequency changer
Assignee: Unisys Corp
•
Filing: 1943-11-08
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Granted: 1950-03-21
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Expires: 1963-11-08
Abstract
No abstract record available.
Inventors
- 👤 William W Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:19
CPC Classifications
H; H03; H03C; H03C1/00; H03C1/52; H03C1/60; H03C3/00; H03C3/30; H03D; H03D7/00; H03D7/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1901605A
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US2280824A
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US2338237A
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US2239421A
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US2252565A
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US2317140A
Cited
US2381320A
Cited
US2407667A
Cited
US2329780A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-20 | 1953-09-19 | 1954-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-20 | 1957-09-19 | 1958-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-20 | 1961-09-19 | 1962-03-21 | $7700.00 | Window Closed / Lapsed |