US3308336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Periodic slow wave circuit having capacitive coupling between alternate periodic elements
Assignee: SFD LAB Inc
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Filing: 1962-01-03
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Granted: 1967-03-07
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Expires: 1982-01-03
Abstract
No abstract record available.
Inventors
- 👤 Hunter L Mcdowell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:09
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/24; H01J25/00; H01J25/34; H01J25/42; H01J25/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2890384A
Cited
GB863992A
Cited
US2925518A
Cited
US3096457A
Cited
US3192435A
Cited
US3176188A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |