US3863111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycrystalline varistor surge protective device for high frequency applications
Assignee: General Electric Co
•
Filing: 1973-06-29
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Granted: 1975-01-28
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Expires: 1993-06-29
Abstract
Abstract A polycrystalline varistor of the bulk effect zinc oxide base type adapted for use in voltage surge suppression on VHF signal lines is disclosed. The device comprises a connector having a housing attached thereto containing a polycrystalline varistor and a conductive spring member. The spring member is configured to provide for the proper mechanical positioning of the varistor and to provide an electrical inductance in series with the varistor to prevent capacitive loading of the protected signal line.
Inventors
- 👤 Francois D Martzloff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:14
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/12; H01C7/123
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
173 words
Apparatus for suppression of voltage surges on VHF signal cables comprising: a body of varistor material having a pair of opposed faces and an electrode on each of said faces; an inductor having first and second terminals, said first terminal being electrically connected to one of said electrodes; means for connecting said second terminal to a first conductor of a VHF signal cable; and means including an electrically conductive housing member for connecting the other of said electrodes to a second conductor of said VHF signal cable; said body of varistor material and said inductor cooperatively forming a series resonant circuit connected between said first and second conductors of said VHF signal cable when the voltage across said first and second conductors is less than the varistor voltage of said body of varistor material; said series resonant circuit being resonant at a frequency below 30 MHz; said inductor being an electrically conductive coil spring disposed within said housing for urging said other of said electrodes into contact with a surface of said housing.
Claim 2
Dependent Claim
173 words
Apparatus for suppression of voltage surges on VHF signal cables comprising: a body of varistor material having a pair of opposed faces and an electrode on each of said faces; an inductor having first and second terminals, said first terminal being electrically connected to one of said electrodes; means for connecting said second terminal to a first conductor of a VHF signal cable; and means including an electrically conductive housing member for connecting the other of said electrodes to a second conductor of said VHF signal cable; said body of varistor material and said inductor cooperatively forming a series resonant circuit connected between said first and second conductors of said VHF signal cable when the voltage across said first and second conductors is less than the varistor voltage of said body of varistor material; said series resonant circuit being resonant at a frequency below 30 MHz; said inductor being an electrically conductive coil spring disposed within said housing for urging said other of said electrodes into contact with a surface of said housing.
Claim 3
Dependent Claim
79 words
The apparatus of claim 1 wherein said means for connecting said second terminal to a first conductor comprises a conductive member having a first portion thereof disposed within said housing and further including: a generally annular insulating member disposed within said housing for supporting said first portion therein and for preventing electrical contact therebetween; and a second portion of said conductive member, said second portion extending through said insulating member from said housing for connection to said first conductor.
Claim 4
Dependent Claim
39 words
Apparatus in accordance with claim 2 including additionally a first coaxial connector having inner and outer conductors, said inner conductor being connected to said second portion of said conductive member and said outer conductor being connected to said housing.
Claim 5
Dependent Claim
32 words
The apparatus of claim 3 including additionally a second coaxial connector connected back-to-back with said first coaxial connector to provide for direct insertion of said apparatus in a coaxial VHF signal cable.
Claim 6
Dependent Claim
15 words
The apparatus of claim 4 wherein said housing is mechanically continuous with said outer conductors.
Claim 7
Dependent Claim
43 words
Apparatus in accordance with claim 2 including additionally a coaxial connector and wherein: said second portion of said conductive member comprises a center conductor of said coaxial connector; and said housing includes a nipple portion comprising an outer conductor of said coaxial connector.
Claim 8
Dependent Claim
40 words
Apparatus in accordance with claim 1 wherein there are a plurality of said bodies of varistor material having electrodes and further comprising conductive means for securing said bodies in a stack configuration and for interconnecting said bodies electrically in parallel.
Claim 9
Dependent Claim
24 words
The apparatus of claim 7 wherein said conductive means is electrically symmetrical to provide for equal current sharing among said bodies of varistor material.
Claim 10
Dependent Claim
31 words
Apparatus in accordance with claim 1 wherein at least a portion of said housing comprises thermally massive, thermally conductive, material to provide a heat sink for said body of varistor material.
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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) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |