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US5231408A
Expired / Lapsed
US
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Glass antenna amplifier
Assignee: Harada Industry Co Ltd
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Filing: 1992-02-19
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Granted: 1993-07-27
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Expires: 2012-02-19
Abstract
Abstract A compensating/amplifying device for a window glass antenna for an automobile. The device utilizes heating wires, which remove fog formed on the automobile window glass, as an antenna and includes band-pass filter coils interposed between a battery of the automobile and the heating wires, and the band-pass filter coils and a floating capacity between the heating wires and ground are used as a part of an input band-pass filter of a compensating amplifier.
Inventors
- 👤 Kazuhiko Nakase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:50
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/1271; H01Q1/1278
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
161 words
A compensated/amplifying device for glass antennas which uses a heating element for removing fog on the glass of a vehicle window as an antenna element, comprising: band-pass filter coils for AM signals and FM signals interposed between a direct current power supply of said vehicle and said heating element, said band-pass filter coils comprising an FM band-pass filters coil, an AM band-pass filters coil and a canceling coil each separately wound, said canceling coil being wound such that a direction and magnitude of a magnetic field created from direct current power supply passing through said canceling coil are opposite to a direction and magnitude of a magnetic field of said AM band-pass coil; an amplifier means coupled to said band-pass filter coils; and a floating capacity formed between said heating element and ground and provided in parallel with said band-pass filter coils, said floating capacity and said band-pass filter coils forming input AM and FM band-pass filters for said amplifier means.
Claim 2
Dependent Claim
161 words
A compensated/amplifying device for glass antennas which uses a heating element for removing fog on the glass of a vehicle window as an antenna element, comprising: band-pass filter coils for AM signals and FM signals interposed between a direct current power supply of said vehicle and said heating element, said band-pass filter coils comprising an FM band-pass filters coil, an AM band-pass filters coil and a canceling coil each separately wound, said canceling coil being wound such that a direction and magnitude of a magnetic field created from direct current power supply passing through said canceling coil are opposite to a direction and magnitude of a magnetic field of said AM band-pass coil; an amplifier means coupled to said band-pass filter coils; and a floating capacity formed between said heating element and ground and provided in parallel with said band-pass filter coils, said floating capacity and said band-pass filter coils forming input AM and FM band-pass filters for said amplifier means.
Claim 3
Dependent Claim
30 words
A device according to claim 1, wherein at least one of said AM and FM band-pass filter coils is wound around a ferrite core which is of a pot type.
Claim 4
Dependent Claim
67 words
A device according to claim 1, wherein said input FM band-pass filter of said compensating amplifier is a band-pass filter for receiving FM band signals and includes a double tuning circuit comprising a primary tuning circuit and a second tuning circuit, said primary tuning circuit including said FM band-pass filter coil which is of an aircore type and said secondary tuning circuit including an inductance and capacitor.
Claim 5
Dependent Claim
76 words
A device according to claim 1, wherein said input AM band-pass filter of said compensating amplifier is a band-pass filter for receiving AM band signals and comprising a primary tuning circuit and a secondary tuning circuit, said primary tuning circuit is a high-pass filter including said AM band-pass filter coil, said floating capacity, and an additional capacity for adjusting tuning frequency, and said secondary tuning circuit is a low-pass filter including an inductance and a capacitor.
Claim 6
Dependent Claim
30 words
A device according to claim 1, wherein at least one of said AM and FM band-pass filter coils is wound around a ferrite core which is of a torroidal type.
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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) | 1996-07-26 | 1997-01-25 | 1997-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-26 | 2001-01-25 | 2001-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-26 | 2005-01-25 | 2005-07-27 | $7700.00 | Window Closed / Lapsed |