Patent US3274464A successfully refreshed from Google Patents.
US3274464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature compensating trimmer capacitor
Assignee: Jfd Electronics Corp
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Filing: 1964-11-03
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Granted: 1966-09-20
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Expires: 1984-11-03
Abstract
No abstract record available.
Inventors
- 👤 Seiden Hugo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:14
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/258
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A TRIMMER CAPACITOR COMPRISING A BUSHING HAVING AN OPENING THEREIN, A HOLLOW DIELECTRIC CYLINDER SECURED TO SAID BUSHING, AN ADJUSTMENT SCREW MEANS CONNECTED TO SAID BUSHING AND EXTENDING THROUGH SAID OPENING IN SAID BUSHING AND INTO SAID HOLLOW DIELECTRIC CYLINDER, AN ELECTRODE BAND SURROUNDING SAID DIELECTRIC CYLINDER, AND A PISTON ASSEMBLY CONNECTED TO THE END OF SAID ADJUSTMENT SCREW AND MOVABLE WITHIN SAID DIELECTRIC CYLINDER; SAID PISTON ASSEMBLY COMPRISING A FIRST AND SECOND COAXIAL PISTON; EACH OF SAID FIRST AND SECOND PISTONS COMPRISING THIN WALLED CYLINDERS HAVING A CLOSED END PORTION; SAID CLOSED END PORTIONS OF EACH OF SAID PISTONS BEING ADJACENT TO ONE ANOTHER; SAID ADJUSTMENT SCREW EXTENDING INTO SAID FIRST PISTON AND BEING CONNECTED TO CENTRAL PORTIONS OF CLOSED END PORTIONS OF EACH OF SAID FIRST AND SECOND PISTONS; SAID FIRST PISTON BEING OF A MATERIAL HAVING A FIRST TEMPERATURE COEFFICIENT OF EXPANSION; SAID SECOND PISTON BEING OF A MATERIAL HAVING A SECOND AND DIFFERENT TEMPERATURE COEFFICIENT OF EXPANSION THAN SAID MATERIAL OF SAID FIRST PISTON.
Claim 2
Dependent Claim
168 words
A TRIMMER CAPACITOR COMPRISING A BUSHING HAVING AN OPENING THEREIN, A HOLLOW DIELECTRIC CYLINDER SECURED TO SAID BUSHING, AN ADJUSTMENT SCREW MEANS CONNECTED TO SAID BUSHING AND EXTENDING THROUGH SAID OPENING IN SAID BUSHING AND INTO SAID HOLLOW DIELECTRIC CYLINDER, AN ELECTRODE BAND SURROUNDING SAID DIELECTRIC CYLINDER, AND A PISTON ASSEMBLY CONNECTED TO THE END OF SAID ADJUSTMENT SCREW AND MOVABLE WITHIN SAID DIELECTRIC CYLINDER; SAID PISTON ASSEMBLY COMPRISING A FIRST AND SECOND COAXIAL PISTON; EACH OF SAID FIRST AND SECOND PISTONS COMPRISING THIN WALLED CYLINDERS HAVING A CLOSED END PORTION; SAID CLOSED END PORTIONS OF EACH OF SAID PISTONS BEING ADJACENT TO ONE ANOTHER; SAID ADJUSTMENT SCREW EXTENDING INTO SAID FIRST PISTON AND BEING CONNECTED TO CENTRAL PORTIONS OF CLOSED END PORTIONS OF EACH OF SAID FIRST AND SECOND PISTONS; SAID FIRST PISTON BEING OF A MATERIAL HAVING A FIRST TEMPERATURE COEFFICIENT OF EXPANSION; SAID SECOND PISTON BEING OF A MATERIAL HAVING A SECOND AND DIFFERENT TEMPERATURE COEFFICIENT OF EXPANSION THAN SAID MATERIAL OF SAID FIRST PISTON.
References Cited (Backward Citations)
US2989630A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |