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Patent US2968013A successfully refreshed from Google Patents.
US2968013A
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US
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Hollow electrical resonators
Assignee: EMI Ltd
•
Filing: 1956-09-28
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Granted: 1961-01-10
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Expires: 1976-09-28
Abstract
No abstract record available.
Inventors
- 👤 Auld Bert Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:01
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/18; H01J23/20; H01J23/207
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
AT106681B
Cited
USRE22990E
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US2444066A
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US2286396A
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FR892097A
Cited
US2647952A
Cited
US2656484A
Cited
US2736868A
Cited
US2587136A
Cited
US2617071A
Cited
US2779873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-10 | 1964-07-11 | 1965-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-10 | 1968-07-11 | 1969-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-10 | 1972-07-11 | 1973-01-10 | $7700.00 | Window Closed / Lapsed |