US3621385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Meter for measuring capacitances of extremely high loss dielectric materials
Assignee: Kett Electric Laboratory
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Filing: 1969-11-14
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Granted: 1971-11-16
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Expires: 1989-11-14
Abstract
Abstract A capacitance meter for measuring capacitance of extremely high loss dielectric materials comprises a series resonant circuit which includes two parallel circuits. One of the parallel circuits comprises a fixed capacitor, a first portion of a variable gang capacitor, and a first test sample; and the other parallel circuit comprises an inductance, a second portion of the variable gang capacitor, and a second test sample identical to the first sample. An accurate measurement of the capacitance of the material in the samples, irrespective of values of resistance components thereof, is effected through a substitution method by adjusting the variable gang capacitor.
Inventors
- 👤 Bunjiro Ichijo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:04
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/26; G01R27/2605; G01R27/2617; G01R27/2623
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A capacitance meter for measuring capacitances of extremely high loss dielectric materials comprising: a primary circuit including a high-frequency oscillator, of stable angular frequency omega , having a tank circuit; a phase-discriminating circuit coupled to said tank circuit, and a first series resonance circuit coupled to said tank circuit and to said phase-discriminating circuit; and a secondary circuit comprising a second series resonance circuit electromagnetically coupled to the first series resonance circuit of said primary circuit, said second circuit including a pair of inductances L1 and l2 and a pair of capacitances C1 and C2, a calibrated gang variable condenser having capacitances C22 and C''2 connected in parallel respectively with a capacitor of capacitance C21 and with said inductance L2, and two identical test samples, whose capacitances are to be measured, connected respectively in parallel with said capacitance C2 and with said inductance L2, the values of said elements satisfying the conditions
Claim 2
Dependent Claim
152 words
A capacitance meter for measuring capacitances of extremely high loss dielectric materials comprising: a primary circuit including a high-frequency oscillator, of stable angular frequency omega , having a tank circuit; a phase-discriminating circuit coupled to said tank circuit, and a first series resonance circuit coupled to said tank circuit and to said phase-discriminating circuit; and a secondary circuit comprising a second series resonance circuit electromagnetically coupled to the first series resonance circuit of said primary circuit, said second circuit including a pair of inductances L1 and l2 and a pair of capacitances C1 and C2, a calibrated gang variable condenser having capacitances C22 and C''2 connected in parallel respectively with a capacitor of capacitance C21 and with said inductance L2, and two identical test samples, whose capacitances are to be measured, connected respectively in parallel with said capacitance C2 and with said inductance L2, the values of said elements satisfying the conditions
References Cited (Backward Citations)
US2906950A
Cited
US3179881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |