Patent US4274843A successfully refreshed from Google Patents.
US4274843A
Expired / Lapsed
US
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Electrostatic type car air purifier
Assignee: Nissan Motor Co Ltd
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Filing: 1979-07-11
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Granted: 1981-06-23
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Expires: 1999-07-11
Abstract
Abstract An electrostatic type car air purifier comprising a high voltage generating portion, in which a number of tandemly connected resistors of high resistance value are inserted in an output circuit of the generating portion so as to suppress irradiation of electromagnetic noise and to thereby prevent electromagnetic interference in a mounted car radio or other car electric equipment.
Inventors
- 👤 Masazumi Sone
- 👤 Kazuhiko Suzuki
- 👤 Yukitsugu Fukumori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:23
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/66; B60; B60H; B60H3/00; B60H3/0071; B60H3/0078
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
In an electrostatic type car air purifier having an air inlet and an air outlet comprising an electrostatic dust collector portion, a negative ion generator, and a high voltage generating portion having outputs for producing high voltages for operating respectively the dust collector portion and the negative ion generator, a system for reducing generation of electromagnetic noise from the high voltage generating portion comprising a high resistance means in series with rectifying diode means in the respective outputs of the high voltage generating portion, each of said high resistance means including a plurality of resistances connected in tandem to improve filtering by reduced stray capacitance across the resistance means and increased stray capacitance to a ground, wherein the resistance value of said high resistance means is between 500 kΩ and 2 MΩ.
Claim 2
Dependent Claim
132 words
In an electrostatic type car air purifier having an air inlet and an air outlet comprising an electrostatic dust collector portion, a negative ion generator, and a high voltage generating portion having outputs for producing high voltages for operating respectively the dust collector portion and the negative ion generator, a system for reducing generation of electromagnetic noise from the high voltage generating portion comprising a high resistance means in series with rectifying diode means in the respective outputs of the high voltage generating portion, each of said high resistance means including a plurality of resistances connected in tandem to improve filtering by reduced stray capacitance across the resistance means and increased stray capacitance to a ground, wherein the resistance value of said high resistance means is between 500 kΩ and 2 MΩ.
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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) | 1984-06-22 | 1984-12-22 | 1985-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-22 | 1988-12-22 | 1989-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-22 | 1992-12-22 | 1993-06-23 | $7700.00 | Window Closed / Lapsed |