US3295042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitance to d. c. voltage converter
Assignee: Robertshaw Controls Co
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Filing: 1963-10-14
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Granted: 1966-12-27
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Expires: 1983-10-14
Abstract
No abstract record available.
Inventors
- 👤 Evalds Egils
- 👤 John J Coyne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:08
CPC Classifications
H; H04; H04R; H04R19/00; G; G01; G01R; G01R27/00; G01R27/02; G01R27/26; G01R27/2605; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338; H02M3/3381; H03; H03B; H03B5/00; H03B5/08; H03B5/12; H03B5/1203; H03B5/1231; H03B5/1237; H03B5/124; H03B5/1243; H03B5/1296; H03D; H03D11/00; H03D11/02; H03D11/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A CAPACITANCE TO D.C. VOLTAGE CONVERTER ENERGIZED FROM A D.C. POWER SUPPLY COMPRISING A SENSING CAPACITOR; A RESISTOR; A TRANSISTOR OSCILLATOR INCLUDING SAID CAPACITOR AND SAID RESISTOR, SAID OSCILLATOR PRODUCING AN OSCILLATING SIGNAL HAVING AN AMPLITUDE WHICH VARIES IN PROPORTION TO THE CHANGE IN THE CAPACITANCE OF SAID SENSING CAPACITOR AND HAVING A QUIESCENT CURRENT WHICH FLOWS THROUGH SAID RESISTOR; AN OUTPUT CIRCUIT INCLUDING A WINDING, A DIODE AND A PORTION OF SAID RESISTOR CONNECTED IN SAID SERIES, AND WINDING BEING INDUCTIVELY COUPLE TO SAID OSCILLATOR WHEREBY SAID OUTPUT CIRCUIT PROVIDES A D.C. VOLTAGE OUTPUT SIGNAL WHICH IS PROPORTIONAL TO SAID OSCILLATING SIGNAL AND THE VOLTAGE DEVELOPED ACROSS SAID PORTION OF SAID RESISTOR BY SAID QUIESCENT CURRENT.
Claim 2
Dependent Claim
117 words
A CAPACITANCE TO D.C. VOLTAGE CONVERTER ENERGIZED FROM A D.C. POWER SUPPLY COMPRISING A SENSING CAPACITOR; A RESISTOR; A TRANSISTOR OSCILLATOR INCLUDING SAID CAPACITOR AND SAID RESISTOR, SAID OSCILLATOR PRODUCING AN OSCILLATING SIGNAL HAVING AN AMPLITUDE WHICH VARIES IN PROPORTION TO THE CHANGE IN THE CAPACITANCE OF SAID SENSING CAPACITOR AND HAVING A QUIESCENT CURRENT WHICH FLOWS THROUGH SAID RESISTOR; AN OUTPUT CIRCUIT INCLUDING A WINDING, A DIODE AND A PORTION OF SAID RESISTOR CONNECTED IN SAID SERIES, AND WINDING BEING INDUCTIVELY COUPLE TO SAID OSCILLATOR WHEREBY SAID OUTPUT CIRCUIT PROVIDES A D.C. VOLTAGE OUTPUT SIGNAL WHICH IS PROPORTIONAL TO SAID OSCILLATING SIGNAL AND THE VOLTAGE DEVELOPED ACROSS SAID PORTION OF SAID RESISTOR BY SAID QUIESCENT CURRENT.
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) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |