Patent US3988665A successfully refreshed from Google Patents.
US3988665A
Expired / Lapsed
US
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Eddy current test coil assembly using printed circuit conductor means
Assignee: Institut Dr Friedrich Foerster Pruefgeraetebau GmbH and Co KG
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Filing: 1975-03-12
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Granted: 1976-10-26
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Expires: 1995-03-12
Abstract
Abstract An eddy current coil test assembly comprises a printed circuit board having respective conductors which form the excitation coil winding, the sensing coil winding, the input transformer winding, the output transformer winding and the connections between these respective elements. Pot core type transformers are mounted in close proximity to said windings. The printed transformer windings constitute respectively the secondary winding of the input transformer and the primary winding of the output transformer.
Inventors
- 👤 Peter Neumaier
- 👤 Helmut Reitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:08
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/9006
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
159 words
An eddy current test coil assembly comprising: a base of flexible electrically insulating material; an excitation winding in the form of a pair of substantially straight printed conductors disposed on said base; a sensing winding in the form of a U-shaped printed conductor disposed on said base; a first and a second transformer winding in the form of respective substantially straight printed conductors disposed on said base; conductive means in the form of substantially straight conductors disposed on said base and connecting said excitation winding conductors with said first transformer winding conductors; all of said conductors, when said base is flat with exception of the base of the U-shaped conductor being substantially parallel to one another and when said base is looped for joining said sensing winding to said second transfomer winding being arranged and connected to provide loops for forming an excitation winding loop, a sensing winding loop, and a respective first and a second transformer winding loop.
Claim 2
Dependent Claim
159 words
An eddy current test coil assembly comprising: a base of flexible electrically insulating material; an excitation winding in the form of a pair of substantially straight printed conductors disposed on said base; a sensing winding in the form of a U-shaped printed conductor disposed on said base; a first and a second transformer winding in the form of respective substantially straight printed conductors disposed on said base; conductive means in the form of substantially straight conductors disposed on said base and connecting said excitation winding conductors with said first transformer winding conductors; all of said conductors, when said base is flat with exception of the base of the U-shaped conductor being substantially parallel to one another and when said base is looped for joining said sensing winding to said second transfomer winding being arranged and connected to provide loops for forming an excitation winding loop, a sensing winding loop, and a respective first and a second transformer winding loop.
Claim 3
Dependent Claim
54 words
An eddy current test coil assembly as set forth in claim 1, and score lines disposed in said base between said first and said second transformer windings for separating and bending said transformer windings away from each other to provide for each of said transformer windings to become a part of a separate transformer.
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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) | 1979-10-26 | 1980-04-26 | 1980-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-26 | 1984-04-26 | 1984-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-26 | 1988-04-26 | 1988-10-26 | $7700.00 | Window Closed / Lapsed |