Patent EP0919996A2 successfully refreshed from Google Patents.
Patent US3852734A successfully refreshed from Google Patents.
US3852734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna insulation failure detector
Assignee: Individual
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Filing: 1972-09-28
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Granted: 1974-12-03
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Expires: 1992-09-28
Abstract
Abstract A device for detecting direct current flow of either polarity, in a system, usually due to corona discharge or lightning attachment. The device is unresponsive to alternating currents; and therefore, passes radio frequency signals. The device employs a means for signaling direct current flow and a means whereby it may be reset to be used again.
Inventors
- 👤 R Truax
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:57
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/145; G01R19/15
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
165 words
An apparatus for monitoring a direct current between a body normally electrically insulated from a reference point and said reference point, said apparatus comprising: A. a terminal, insulated from a reference point, adapted to be connected to a body, B. storage means, connected between said terminal and said reference point, for storing energy, C. indicating means, connected to said storage means, for indicating the occurrence of direct current therethrough, D. normally open switch means, connected to said indicating means and to said reference point, for connecting said indicating means to said reference point when the switch means is closed, the switch means having a control terminal for closing the switch means in response to a signal on said control terminal, and E. threshold voltage means, connected to said control terminal and responsive to a potential on said storage means, for closing said normally open switch means by placing a signal on said control terminal when the potential on said storage means reaches a predetermined voltage.
Claim 2
Independent Claim
165 words
An apparatus for monitoring a direct current between a body normally electrically insulated from a reference point and said reference point, said apparatus comprising: A. a terminal, insulated from a reference point, adapted to be connected to a body, B. storage means, connected between said terminal and said reference point, for storing energy, C. indicating means, connected to said storage means, for indicating the occurrence of direct current therethrough, D. normally open switch means, connected to said indicating means and to said reference point, for connecting said indicating means to said reference point when the switch means is closed, the switch means having a control terminal for closing the switch means in response to a signal on said control terminal, and E. threshold voltage means, connected to said control terminal and responsive to a potential on said storage means, for closing said normally open switch means by placing a signal on said control terminal when the potential on said storage means reaches a predetermined voltage.
Claim 3
Dependent Claim
34 words
The apparatus of claim 1 further comprising impedance means, connected between said terminal and said storage means, for preventing the flow of radio frequency energy through said threshold voltage means to said reference point.
Claim 4
Dependent Claim
27 words
The apparatus of claim 1 further comprising potential limiting means, connected between said terminal and said reference point, for shunting excessively high potentials to said reference point.
Claim 5
Dependent Claim
26 words
The apparatus of claim 1 further comprising static drain means, connected between said terminal and said reference point, for draining static charge from said storage means.
Claim 6
Dependent Claim
22 words
The apparatus of claim 1 wherein said indicating means is a latching relay responsive to a current flowing through said switch means.
Claim 7
Dependent Claim
16 words
The apparatus of claim 1 wherein the normally open switch means is a gate-controlled silicon switch.
Claim 8
Independent Claim
153 words
An apparatus for monitoring a direct current between an antenna normally electrically insulated from a ground and said ground comprising: A. a terminal insulated from ground and adapted to be connected to an antenna, B. a capacitor connected between said terminal and ground for storing energy, C. a relay, connected to said capacitor, for indicating the occurrence of direct current therethrough, D. a gate controlled silicon switch, connected between said relay and ground, for connecting said relay to ground when the silicon switch is conducting, the silicon switch having a control terminal for causing the silicon switch to conduct in response to a signal on said control terminal, and E. threshold voltage means, connected to said control terminal and responsive to a potential on said capacitor, for causing said gate controlled silicon switch to conduct by placing a signal on said control terminal when the potential across said capacitor reaches a predetermined voltage.
Claim 9
Independent Claim
153 words
An apparatus for monitoring a direct current between an antenna normally electrically insulated from a ground and said ground comprising: A. a terminal insulated from ground and adapted to be connected to an antenna, B. a capacitor connected between said terminal and ground for storing energy, C. a relay, connected to said capacitor, for indicating the occurrence of direct current therethrough, D. a gate controlled silicon switch, connected between said relay and ground, for connecting said relay to ground when the silicon switch is conducting, the silicon switch having a control terminal for causing the silicon switch to conduct in response to a signal on said control terminal, and E. threshold voltage means, connected to said control terminal and responsive to a potential on said capacitor, for causing said gate controlled silicon switch to conduct by placing a signal on said control terminal when the potential across said capacitor reaches a predetermined voltage.
Claim 10
Dependent Claim
14 words
The apparatus of claim 7 wherein the threshold voltage means is an avalanche diode.
Claim 11
Dependent Claim
31 words
The apparatus of claim 7 further comprising a resistor, connected between said terminal and said capacitor, for preventing the flow of radio frequency energy through said threshold voltage means to ground.
Claim 12
Dependent Claim
27 words
The apparatus of claim 7 further comprising a resistor connected in parallel with said capacitor between said terminal and ground for draining static charge from said capacitor.
Claim 13
Dependent Claim
23 words
The apparatus of claim 7 further comprising an avalanche diode, connected between said terminal and ground, for shunting excessively high potentials to ground.
Claim 14
Dependent Claim
12 words
The apparatus of claim 7 wherein said relay is a latching relay.
Claim 15
Dependent Claim
17 words
The apparatus of claim 12 further comprising means for resetting said latching relay to an unlatched position.
Claim 16
Dependent Claim
29 words
The apparatus of claim 7 further comprising a resistor connected between said threshold voltage means and said silicone switch control terminal for limiting the current to said control terminal.
Claim 17
Dependent Claim
16 words
The apparatus of claim 7 further comprising means for testing for correct operation of said relay.
Claim 18
Dependent Claim
27 words
The apparatus of claim 7 further comprising indicating means, remotely positioned from and connected to said relay, for remotely indicating the occurrence of a direct current therethrough.
Claim 19
Independent Claim
170 words
An apparatus for monitoring a direct current between a body normally electrically insulated from a reference point and said reference point, said apparatus comprising: A. a terminal, insulated from a reference point, adapted to be connected to a body, B. storage means, connected between said terminal and said reference point, for storing energy, C. indicating means, connected to said storage means and adapted for repeated operation, for repeatedly indicating the occurrence of direct current therethrough, D. normally open switch means, connected between said indicating means and said reference point, for connecting said indicating means to said reference point when the switch means is closed, the switch means having a control terminal for closing the switch means in response to a signal on said control terminal, and E. threshold voltage means, cOnnected to said control terminal and responsive to a potential on said storage means, for closing said normally open switch means by placing a signal on said control terminal when the potential on said storage means reaches a predetermined voltage.
Claim 20
Independent Claim
170 words
An apparatus for monitoring a direct current between a body normally electrically insulated from a reference point and said reference point, said apparatus comprising: A. a terminal, insulated from a reference point, adapted to be connected to a body, B. storage means, connected between said terminal and said reference point, for storing energy, C. indicating means, connected to said storage means and adapted for repeated operation, for repeatedly indicating the occurrence of direct current therethrough, D. normally open switch means, connected between said indicating means and said reference point, for connecting said indicating means to said reference point when the switch means is closed, the switch means having a control terminal for closing the switch means in response to a signal on said control terminal, and E. threshold voltage means, cOnnected to said control terminal and responsive to a potential on said storage means, for closing said normally open switch means by placing a signal on said control terminal when the potential on said storage means reaches a predetermined voltage.
Claim 21
Dependent Claim
33 words
The apparatus of claim 17 wherein said body is an antenna having insulation thereon and said storage means is adapted to store energy from a current resulting from a failure of said insulation.
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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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |