Patent US4769815A successfully refreshed from Google Patents.
US2971104A
Expired / Lapsed
US
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Tuning fork assembly including driving and pick-up coils
Assignee: VARO Manufacturing Co Inc
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Filing: 1957-04-22
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Granted: 1961-02-07
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Expires: 1977-04-22
Abstract
No abstract record available.
Inventors
- 👤 Jr William J Holt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:18
CPC Classifications
H; H02; H02K; H02K33/00; H02K33/02; H02K33/10; H03; H03H; H03H9/00; H03H9/46; H03H9/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1906985A
Cited
US2147492A
Cited
US2632211A
Cited
US2574188A
Cited
US2678360A
Cited
US2707234A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |