Patent US6214045B1 successfully refreshed from Google Patents.
US2435259A
Expired / Lapsed
US
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Frequency control apparatus
Assignee: Western Union Telegraph Co
•
Filing: 1942-09-30
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Granted: 1948-02-03
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Expires: 1962-09-30
Abstract
No abstract record available.
Inventors
- 👤 Harold F Wilder
- 👤 Albert W Breyfogel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:30
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/05; H04L7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1997084A
Cited
US1945547A
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US2027975A
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US2031224A
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US2028232A
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US2117587A
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US2055208A
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US2113165A
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US2185635A
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US2154484A
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US2236532A
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US2231854A
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US2288375A
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US2326314A
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US2342286A
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US2318979A
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US2342169A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-02-02 | 1951-08-04 | 1952-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-02-02 | 1955-08-04 | 1956-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-02-02 | 1959-08-04 | 1960-02-03 | $7700.00 | Window Closed / Lapsed |