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Patent US2438768A successfully refreshed from Google Patents.
US2438768A
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Apparatus for varying the frequency of resonant cavities
Assignee: Lanteris Space LLC
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Filing: 1944-04-28
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Granted: 1948-03-30
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Expires: 1964-04-28
Abstract
No abstract record available.
Inventors
- 👤 William A Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:20
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2200986A
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US2280824A
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US2213103A
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US2213104A
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US2280026A
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US2349811A
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US2241976A
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US2312919A
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US2329779A
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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) | 1951-03-30 | 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 |