US3725779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for testing the electrical conductivity of filaments
Assignee: Individual
•
Filing: 1970-11-27
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Granted: 1973-04-03
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Expires: 1990-11-27
Abstract
Abstract Apparatus for testing filaments embedded in a material in which the filaments are connected to alternating voltage current and the alternating fields produced by the alternating currents are measured as flowing through the individual filaments by means of induction coils to which a signal transmitter and recorder are connected.
Inventors
- 👤 G Mauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:48
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/84; G; G01; G01R; G01R31/00; G01R31/50; G01R31/52; G01R31/54; H05B1/00; H05B1/02; H05B1/0227; H05B1/023; H05B1/0236; H05B2203/00; H05B2203/035
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
Apparatus for testing the electrical conductivity of a number of filaments embedded in a material, comprising: means for supplying alternating current to said electrical filaments in parallel; a number of induction coils mounted adjacent said material and each positioned with respect to an individual one of said filaments to detect the flow of current therein; means responsive to said number of induction coils for recording the conductivity or non-conductivity of said electrical filaments, said means for recording includes a first and second array of bulbs, each array having a number of bulbs corresponding to said number of electrical filaments and each bulb associated with a corresponding filament wherein said first array indicates non-conductivity and said second array indicates conductivity of said filaments; and switching means actuated by individual ones of said number of coils for actuating an individual one of the bulbs in said first or second array of bulbs.
Claim 2
Dependent Claim
150 words
Apparatus for testing the electrical conductivity of a number of filaments embedded in a material, comprising: means for supplying alternating current to said electrical filaments in parallel; a number of induction coils mounted adjacent said material and each positioned with respect to an individual one of said filaments to detect the flow of current therein; means responsive to said number of induction coils for recording the conductivity or non-conductivity of said electrical filaments, said means for recording includes a first and second array of bulbs, each array having a number of bulbs corresponding to said number of electrical filaments and each bulb associated with a corresponding filament wherein said first array indicates non-conductivity and said second array indicates conductivity of said filaments; and switching means actuated by individual ones of said number of coils for actuating an individual one of the bulbs in said first or second array of bulbs.
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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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |