Patent US3202910A successfully refreshed from Google Patents.
US3202910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automotive tachometer using a switched transistor
Assignee: RADSON ENGINEERING Corp
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Filing: 1958-05-13
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Granted: 1965-08-24
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Expires: 1978-05-13
Abstract
No abstract record available.
Inventors
- 👤 David F Fathauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:43
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/4802; G01P3/4807
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
AN ENGINE TACHOMETER FOR PROVIDING AN INDICATION OF THE SPEED OF AN INTERNAL COMBUSTION ENGINE HAVING AN IGNITION SYSTEM WHICH GENERATES PERIODIC ELECTRICAL IMPULSES, SAID TACHOMETER COMPRISING METER MEANS INDICATING THE MAGNITUDE OF A UNIDIRECTIONAL ELECTRIC CURRENT FLOWING THERETHROUGH, STORAGE CAPACITANCE MEANS AND RESISTANCE MEANS CONNECTED IN SERIES BETWEEN SAID METER MEANS AND A SOURCE OF KNOWN POTENTIAL, A SEMICONDUICTIVE DEVICE HAVING AN ATHERMAL CONSTANT VOLTAGE BREAKDOWN CHARACTERISTIC CONNECTED TO THE COMMON TERMINAL OF SAID STORAGE CAPACITOR AND SAID RESISTANCE MEANS AND CONNECTED TO THE OTHER TERMINAL OF SAID METER MEANS, THE POLARITY OF SAID SEMICONDUCTIVE DEVICE WITH RESPECT TO SAID SOURCE OF KNOWN POTENTIAL BEING SUCE THAT THE SEMICONDUCTIVE
Claim 2
Dependent Claim
110 words
AN ENGINE TACHOMETER FOR PROVIDING AN INDICATION OF THE SPEED OF AN INTERNAL COMBUSTION ENGINE HAVING AN IGNITION SYSTEM WHICH GENERATES PERIODIC ELECTRICAL IMPULSES, SAID TACHOMETER COMPRISING METER MEANS INDICATING THE MAGNITUDE OF A UNIDIRECTIONAL ELECTRIC CURRENT FLOWING THERETHROUGH, STORAGE CAPACITANCE MEANS AND RESISTANCE MEANS CONNECTED IN SERIES BETWEEN SAID METER MEANS AND A SOURCE OF KNOWN POTENTIAL, A SEMICONDUICTIVE DEVICE HAVING AN ATHERMAL CONSTANT VOLTAGE BREAKDOWN CHARACTERISTIC CONNECTED TO THE COMMON TERMINAL OF SAID STORAGE CAPACITOR AND SAID RESISTANCE MEANS AND CONNECTED TO THE OTHER TERMINAL OF SAID METER MEANS, THE POLARITY OF SAID SEMICONDUCTIVE DEVICE WITH RESPECT TO SAID SOURCE OF KNOWN POTENTIAL BEING SUCE THAT THE SEMICONDUCTIVE
References Cited (Backward Citations)
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US2559849A
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US2751553A
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US2934703A
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US2927268A
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US2944215A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |