US3622975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine temperature-indicating apparatus
Assignee: Ford Motor Co
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Filing: 1970-06-22
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Granted: 1971-11-23
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Expires: 1990-06-22
Abstract
Abstract Apparatus for indicating motor vehicle engine or engine coolant temperature is described. The apparatus includes a gauge having movable means for indicating engine temperature, the gauge being operated by an electrical current from a source of electrical power and the indicator position being determined by the amount of current through the gauge. Resistance elements are connected in electrical circuit with the gauge and temperature-responsive switches associated with the engine are provided for selectively connecting and disconnecting the resistances in the gauge circuit. The connection or disconnection of the resistances produce discrete movements of the indicating means.
Inventors
- 👤 Lawrence J Vanderberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:12
CPC Classifications
G; G01; G01K; G01K3/00; G01K3/005; G01K1/00; G01K1/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
212 words
Temperature-indicating apparatus for a motor vehicle to provide the operator thereof with a visual indication of engine or engine coolant operating temperature, which comprises: a source of electrical power; gauge means for temperature indication connected to said source of electrical power and having movable indicating means, the position of said indicating means being determined by the magnitude of electrical current in said gauge means; a first electrical resistance connected in series with said gauge means; first switch means in association with the motor vehicle engine and connected in series with said gauge means and in parallel with said first electrical resistance, said first switch means being in an electrically open condition at temperatures below a predetermined value and in an electrically closed condition at temperatures above the predetermined value; a second electrical resistance; and second temperature-responsive switch means associated with the motor vehicle engine and connected in series with said second electrical resistance, said second switch means being in an electrically closed condition at temperatures below a predetermined value and being in an electrically open condition at temperatures above the predetermined value, and said series connected second electrical resistance and second switch means together being connected in parallel with said gauge means and said parallel-connected first electrical resistance and first switch means.
Claim 2
Dependent Claim
212 words
Temperature-indicating apparatus for a motor vehicle to provide the operator thereof with a visual indication of engine or engine coolant operating temperature, which comprises: a source of electrical power; gauge means for temperature indication connected to said source of electrical power and having movable indicating means, the position of said indicating means being determined by the magnitude of electrical current in said gauge means; a first electrical resistance connected in series with said gauge means; first switch means in association with the motor vehicle engine and connected in series with said gauge means and in parallel with said first electrical resistance, said first switch means being in an electrically open condition at temperatures below a predetermined value and in an electrically closed condition at temperatures above the predetermined value; a second electrical resistance; and second temperature-responsive switch means associated with the motor vehicle engine and connected in series with said second electrical resistance, said second switch means being in an electrically closed condition at temperatures below a predetermined value and being in an electrically open condition at temperatures above the predetermined value, and said series connected second electrical resistance and second switch means together being connected in parallel with said gauge means and said parallel-connected first electrical resistance and first switch means.
Claim 3
Dependent Claim
38 words
Temperature-indicating apparatus in accordance with claim 1, which further includes a relay buzzer electrically connected to said first switch means and operative when said first switch means is in its electrically closed condition to provide an audible signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |