Patent US4214211A successfully refreshed from Google Patents.
US4214211A
Expired / Lapsed
US
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Electrostatic destruction preventing circuit for use in a receiver
Assignee: Pioneer Corp
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Filing: 1978-06-19
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Granted: 1980-07-22
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Expires: 1998-06-19
Abstract
Abstract In an electrostatic destruction preventing circuit employed in a receiver, a capacitor is connected between an antenna terminal and the primary winding of a high frequency transformer, and a spark gap discharge element is connected in parallel to the capacitor to thereby absorb static electricity applied to the antenna terminal.
Inventors
- 👤 Tomohisa Yokogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:57
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/04; H02H9/06; H01; H01T; H01T4/00; H01T4/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
92 words
In an electrostatic destruction preventing circuit for use in a receiver for receiving radio waves of AM and FM broadcastings of the type including an antenna input circuit and a spark-gap discharge element to an antenna terminal to prevent the electrostatic destruction of a first stage transistor in the receiver, the improvement characterized by a capacitor connected in series between the antenna terminal and said antenna input circuit and a spark-gap discharge element connected in parallel to said capacitor, whereby the electrostatic destruction of a first transistor of the receiver is prevented.
Claim 2
Dependent Claim
92 words
In an electrostatic destruction preventing circuit for use in a receiver for receiving radio waves of AM and FM broadcastings of the type including an antenna input circuit and a spark-gap discharge element to an antenna terminal to prevent the electrostatic destruction of a first stage transistor in the receiver, the improvement characterized by a capacitor connected in series between the antenna terminal and said antenna input circuit and a spark-gap discharge element connected in parallel to said capacitor, whereby the electrostatic destruction of a first transistor of the receiver is prevented.
Claim 3
Dependent Claim
22 words
The improvement as claimed in claim 1 wherein said capacitor and said discharge element are integrally formed in a single circuit element.
Claim 4
Dependent Claim
85 words
The improvement as claimed in claim 1 wherein said single circuit element comprises: a ceramic disk having a central opening therein; and first and second conductive wires on the opposite surfaces, respectively, of said disk and extending across said opening, wherein the dielectric of said capacitor is formed by said ceramic disk, and the plates of said capacitor are formed by said conductive wires, and wherein said spark gap discharge element is formed by said conductive wires and the air gap provided by said opening.
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) | 1983-07-22 | 1984-01-21 | 1984-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-22 | 1988-01-21 | 1988-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-22 | 1992-01-21 | 1992-07-22 | $7700.00 | Window Closed / Lapsed |