US5293299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel pump control circuit
Assignee: U Shin Ltd
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Filing: 1992-02-18
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Granted: 1994-03-08
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Expires: 2012-02-18
Abstract
Abstract A fuel pump control circuit includes an SCR for controlling, after turning on of an ignition switch, power supply from a power source to a fuel pump circuit for driving a fuel pump (this SCR being turned on by a gate current supplied from the power source through a first conduction path), a timer circuit for shunting the gate current, which flows into the first conduction path, to a second conduction path when a predetermined time elapses after turning on of the ignition switch, and a current limiting resistor inserted in the first conduction path.
Inventors
- 👤 Hideo Iwabuchi
- 👤 Takeo Shimada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:12
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/3082; H; H03; H03K; H03K17/00; H03K17/28; H03K17/292
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
95 words
A fuel pump control circuit comprising: an SCR for controlling, after turning on of an ignition switch, power supply from a power source to a fuel pump circuit for driving a fuel pump, said SCR being turned on by a gate current supplied from said power source through a first conduction path; a timer circuit for shunting the gate current, which flows into said first conduction path, to a second conduction path when a predetermined time elapses after turning on of said ignition switch; and a current limiting resistor inserted in said first conduction path.
Claim 2
Dependent Claim
95 words
A fuel pump control circuit comprising: an SCR for controlling, after turning on of an ignition switch, power supply from a power source to a fuel pump circuit for driving a fuel pump, said SCR being turned on by a gate current supplied from said power source through a first conduction path; a timer circuit for shunting the gate current, which flows into said first conduction path, to a second conduction path when a predetermined time elapses after turning on of said ignition switch; and a current limiting resistor inserted in said first conduction path.
Claim 3
Dependent Claim
64 words
A circuit according to claim 1, wherein said timer circuit includes a transistor, one output electrode of said transistor being connected to a power source-side terminal of said first conduction path, an input electrode of said transistor being connected to means for setting a control time of said timer circuit, and the other output electrode of said transistor being set at a ground potential.
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) | 1997-03-07 | 1997-09-06 | 1998-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-07 | 2001-09-06 | 2002-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-07 | 2005-09-06 | 2006-03-08 | $7700.00 | Window Closed / Lapsed |