Patent US3068407A successfully refreshed from Google Patents.
US3068407A
Expired / Lapsed
US
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Apparatus for the rapid measurement of slight frequency
Assignee: —
•
Filing: —
•
Granted: 1962-12-11
•
Expires: 1979-12-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:18
CPC Classifications
G; G01; G01R; G01R23/00; G01R23/02; G01R25/00; G01R25/005; H; H03; H03D; H03D13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2535255A
Cited
US2522976A
Cited
US2725528A
Cited
US2930892A
Cited
US2860306A
Cited
US2928047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-10 | 1966-06-11 | 1966-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-10 | 1970-06-11 | 1970-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-10 | 1974-06-11 | 1974-12-11 | $7700.00 | Window Closed / Lapsed |