US2438873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultra high frequency switching device
Assignee: GTE Sylvania Inc
•
Filing: 1944-05-24
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Granted: 1948-03-30
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Expires: 1964-05-24
Abstract
No abstract record available.
Inventors
- 👤 Henry J Mccarthy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:10
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/02; H01J17/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1432867A
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US1694190A
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US2065947A
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US2075855A
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US2304540A
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US2263648A
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US2353743A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-30 | 1951-09-29 | 1952-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-30 | 1955-09-29 | 1956-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-30 | 1959-09-29 | 1960-03-30 | $7700.00 | Window Closed / Lapsed |