US3243736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shielded tuning fork
Assignee: Melpar Inc
•
Filing: 1964-05-04
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Granted: 1966-03-29
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Expires: 1984-05-04
Abstract
No abstract record available.
Inventors
- 👤 William H Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:53
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A TUNING FORK ASSEMBLY PARTICULARLY ADAPTED FOR USE IN FILTERS COMPRISING A TUNING FORK HAVING FIRST AND SECOND TINES, A FIRST ELECTRO-MAGNETIC COIL FOR ENERGIZING SAID FIST TINE, A SECOND ELECTRO-MAGNETIC COIL COUPLED TO SAID SECONE TINE, MEANS FOR ELECTROMAGNETICALLY DECOUPLING SAID FIRST COIL AND TINE FROM SAID SECOND COIL AND TINE, SAID LAST NAMED MEANS INCLUDING A FIRST ELECTROMAGNETIC SHIELD OF HIGHLY PERMEABLE METAL SUBSTANTIALLY SURROUNDING SAID FIRST COIL AND TINE AND A SECOND ELECTROMAGNETIC SHIELD OF HIGHLY PERMEABLE METAL SUBSTANTIALLY SURROUNDING SAID SECOND COIL AND TINE.
Claim 2
Dependent Claim
88 words
A TUNING FORK ASSEMBLY PARTICULARLY ADAPTED FOR USE IN FILTERS COMPRISING A TUNING FORK HAVING FIRST AND SECOND TINES, A FIRST ELECTRO-MAGNETIC COIL FOR ENERGIZING SAID FIST TINE, A SECOND ELECTRO-MAGNETIC COIL COUPLED TO SAID SECONE TINE, MEANS FOR ELECTROMAGNETICALLY DECOUPLING SAID FIRST COIL AND TINE FROM SAID SECOND COIL AND TINE, SAID LAST NAMED MEANS INCLUDING A FIRST ELECTROMAGNETIC SHIELD OF HIGHLY PERMEABLE METAL SUBSTANTIALLY SURROUNDING SAID FIRST COIL AND TINE AND A SECOND ELECTROMAGNETIC SHIELD OF HIGHLY PERMEABLE METAL SUBSTANTIALLY SURROUNDING SAID SECOND COIL AND TINE.
References Cited (Backward Citations)
US1743178A
Cited
US3083607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-28 | 1969-09-27 | 1970-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-28 | 1973-09-27 | 1974-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-28 | 1977-09-27 | 1978-03-29 | $7700.00 | Window Closed / Lapsed |