US4757249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle dual electrical system
Assignee: Deere and Co
•
Filing: 1987-06-15
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Granted: 1988-07-12
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Expires: 2007-06-15
Abstract
Abstract A vehicle electrical system includes dual alternator/battery sets separately connected to separate non-critical electrical loads, and both connected through a diode circuit to a critical electrical load. A starter switch connects both batteries to the engine starter motor.
Inventors
- 👤 Arnold S. Farber
- 👤 Charles W. Formwalt, Jr.
- 👤 Kenneth D. Baxter
- 👤 Donald K. Pfundstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:54
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/14; H02J7/1423; H02J7/1438; H02J7/143; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
198 words
An electrical system for a vehicle having an engine and an electrical starter motor, the electrical system comprising: a first engine driven electric generator; a second engine driven electric generator; a first battery connected to the first generator, the first battery having grounded and ungrounded terminals; a second battery connected to the second generator, the second battery having grounded and ungrounded terminals, the ungrounded terminals of both batteries normally having substantially the same electrical potential; a first non-critical electric load normally connected only to the first generator and to the first battery; a second non-critical electric load normally connected only to the second generator and to the second battery; a critical electrical load; a diode circuit connecting the critical load to both generators and to the ungrounded terminals of both batteries, the diode circuit comprising a first diode with an anode connected to the first generator and to the first battery, and a second diode with an anode connected to the second generator and to the second battery, the cathodes of both diodes being connected to the critical load; and a starter switch operable to simultaneously connect both the ungrounded terminals of both batteries to the starter motor.
Claim 2
Dependent Claim
198 words
An electrical system for a vehicle having an engine and an electrical starter motor, the electrical system comprising: a first engine driven electric generator; a second engine driven electric generator; a first battery connected to the first generator, the first battery having grounded and ungrounded terminals; a second battery connected to the second generator, the second battery having grounded and ungrounded terminals, the ungrounded terminals of both batteries normally having substantially the same electrical potential; a first non-critical electric load normally connected only to the first generator and to the first battery; a second non-critical electric load normally connected only to the second generator and to the second battery; a critical electrical load; a diode circuit connecting the critical load to both generators and to the ungrounded terminals of both batteries, the diode circuit comprising a first diode with an anode connected to the first generator and to the first battery, and a second diode with an anode connected to the second generator and to the second battery, the cathodes of both diodes being connected to the critical load; and a starter switch operable to simultaneously connect both the ungrounded terminals of both batteries to the starter motor.
References Cited (Backward Citations)
US2085275A
Cited
US3763415A
Cited
US4336485A
Cited
US4347473A
Cited
US4454464A
Cited
US4539515A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |