Patent US4334255A successfully refreshed from Google Patents.
US4334255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protection device for a vehicle-mounted air conditioner compressor
Assignee: Nissan Motor Co Ltd
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Filing: 1980-10-14
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Granted: 1982-06-08
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Expires: 2000-10-14
Abstract
Abstract A protection device for a vehicle-mounted air conditioner compressor wherein an electric current for engaging the electro-magnetic clutch of the air conditioner compressor is also fed through a PTC ceramic resistor disposed between a starter contact of the ignition switch and a terminal of the electro-magnetic clutch during the starting operation of an engine in addition to an operation of the conventional circuit including a compressor relay and a compressor switch.
Inventors
- 👤 Masao Izumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:15
CPC Classifications
F; F25; F25B; F25B49/00; F25B49/005; B; B60; B60H; B60H1/00; B60H1/32; B60H1/3204; B60H1/3225; H; H02; H02H; H02H5/00; H02H5/08; H02H5/086
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
137 words
A protection device for a vehicle air conditioner compressor comprising: an electro-magnetic clutch of an air conditioner compressor; an ignition switch having a plurality of contacts including an on contact and a starter contact; a compressor relay having a pair of relay contacts, each of which being connected respectively to the on contact of the ignition switch and a terminal of the electro-magnetic clutch, the relay coil of which is energized by an electric current flowing through the on contact of the ignition switch; and a PTC ceramic resistor connected between the starter contact of the ignition switch and the terminal of the electro-magnetic clutch, said PTC ceramic resistor being provided for allowing a driving current of said electro-magnetic clutch for a predetermined duration after a time when said ignition switch is switched to said starter contact.
Claim 2
Dependent Claim
137 words
A protection device for a vehicle air conditioner compressor comprising: an electro-magnetic clutch of an air conditioner compressor; an ignition switch having a plurality of contacts including an on contact and a starter contact; a compressor relay having a pair of relay contacts, each of which being connected respectively to the on contact of the ignition switch and a terminal of the electro-magnetic clutch, the relay coil of which is energized by an electric current flowing through the on contact of the ignition switch; and a PTC ceramic resistor connected between the starter contact of the ignition switch and the terminal of the electro-magnetic clutch, said PTC ceramic resistor being provided for allowing a driving current of said electro-magnetic clutch for a predetermined duration after a time when said ignition switch is switched to said starter contact.
Claim 3
Dependent Claim
31 words
A protection device as claimed in claim 1, further comprising a temperature responsive switch connected in series with the PTC ceramic resistor which opens upon detection of a predetermined outside temperature.
Claim 4
Dependent Claim
41 words
A protection device as claimed in claim 2, further comprising a low pressure switch interposed between the terminal of the electro-magnetic clutch and the relay contact of the compressor relay which opens upon detection of a reduction in the refrigerant pressure.
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) | 1985-06-07 | 1985-12-07 | 1986-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-07 | 1989-12-07 | 1990-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-07 | 1993-12-07 | 1994-06-08 | $7700.00 | Window Closed / Lapsed |