US3721899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuity test and indicating circuit
Assignee: United States Department of the Army
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Filing: 1971-10-06
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Granted: 1973-03-20
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Expires: 1991-10-06
Abstract
Abstract The circuitry of modules is checked by the use of a switching device which selectively connects all possible combinations of pairs of terminals of a selected module to a sensing circuit. The sensing circuit enables a selective SCR when there is continuity between the selective pairs of terminals. The enabled SCRs cause a further switching system to be programed in a binary fashion whereby the switching system will power an indicator to visually show all the connections in the module.
Inventors
- 👤 J Haywood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:05
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/28; G01R31/2832; G01R31/2836; G01R31/2844
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
251 words
A testing circuit for testing a plurality of modules each having a plurality of terminals thereon; first switching means; voltage supply means; a plurality of control switching means having a control input; said first switching means being connected to the terminals of the module so as to selectively connect pairs of the terminals between said voltage supply means and a selected one of the controlled inputs of said control switching means so as to activate the controlled switching means if there is a path between the selected terminals of the module; indicating means connected to said control switching means so as to indicate which terminals of the module have conducting paths therebetween; selector switches having a plurality of contacts and a plurality of sweep arms; said contacts being connected to the terminals of said modules so that by position of the sweep arms a single one of the modules may be selected to be connected to the sweep arms; said sweep arms being connected to said first switching means; said indicating means contains a binary switching system having output connected to visual readout means of the circuit of the module; a plurality of control solenoids for the binary switching system; said plurality of control switching means being silicon control rectifiers; and a voltage supply means connecting individual silicon control rectifiers to selected one of said control solenoids so as to control the position of the binary switch to connect an indicator in accordance with the conditions of the silicon control rectifiers.
Claim 2
Dependent Claim
251 words
A testing circuit for testing a plurality of modules each having a plurality of terminals thereon; first switching means; voltage supply means; a plurality of control switching means having a control input; said first switching means being connected to the terminals of the module so as to selectively connect pairs of the terminals between said voltage supply means and a selected one of the controlled inputs of said control switching means so as to activate the controlled switching means if there is a path between the selected terminals of the module; indicating means connected to said control switching means so as to indicate which terminals of the module have conducting paths therebetween; selector switches having a plurality of contacts and a plurality of sweep arms; said contacts being connected to the terminals of said modules so that by position of the sweep arms a single one of the modules may be selected to be connected to the sweep arms; said sweep arms being connected to said first switching means; said indicating means contains a binary switching system having output connected to visual readout means of the circuit of the module; a plurality of control solenoids for the binary switching system; said plurality of control switching means being silicon control rectifiers; and a voltage supply means connecting individual silicon control rectifiers to selected one of said control solenoids so as to control the position of the binary switch to connect an indicator in accordance with the conditions of the silicon control rectifiers.
References Cited (Backward Citations)
US3492571A
Cited
US3439268A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |