US3559100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetically driven tuning fork
Assignee: PHILAMON LAB Inc
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Filing: 1969-02-03
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Granted: 1971-01-26
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Expires: 1989-02-03
Abstract
Abstract THERE IS DISCLOSED AN ELECTROMAGNETICALLY DRIVEN TUNING FORK STRUCTURE WITH A DRIVE COIL AND A PICKUP COIL DISPOSED NEAR THE END OF THE TUNING FORK TINES AND ON OPPOSITE SIDES THEREOF, THE MAGNETIC BIAS PROVIDED BY THE CORES OF THE COILS IS SYMMETRIC WITH RESPECT TO THE TUNING FORK AXIS. A LOW RELUCTANCE MAGNETIC CIRCUIT IS PROVIDED INCLUDING THE BASE OF THE STRUCTURE WHICH TENDS TO LIMIT THE MAGNETIC FLUX FROM THE DRIVE COIL TO THE SIDE OF THE STRUCTURE OCCUPIED BY THE DRIVE COIL AND THUS LIMIT THE INFLUENCE OF TRAY FIELDS IN THE PICKUP COIL.
Inventors
- 👤 Boris F Grib
- 👤 George L Vollet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:28
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |