Patent US2756337A successfully refreshed from Google Patents.
US2756337A
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US
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Frequency-control system
Assignee: Hazeltine Research Inc
•
Filing: 1952-03-12
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Granted: 1956-07-24
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Expires: 1972-03-12
Abstract
No abstract record available.
Inventors
- 👤 William J Shanahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:10
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/32; G01S13/34; H; H03; H03C; H03C3/00; H03C3/02; H03C3/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2114036A
Cited
US2296962A
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US2475074A
Cited
US2617040A
Cited
US2583023A
Cited
US2547890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-24 | 1960-01-23 | 1960-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-24 | 1964-01-23 | 1964-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-24 | 1968-01-23 | 1968-07-24 | $7700.00 | Window Closed / Lapsed |