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US3849878A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of making resistance element

Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1972-12-04
•
Granted: 1974-11-26
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Expires: 1992-12-04
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Abstract

Abstract A method of making wire wound electrical resistance elements comprising the steps of winding a respective resistance wire helically around and along each of a plurality of elongated wire cores which cores are coated with an insulating material, coating each of said wound cores with a protective layer, arranging said wound cores in closely spaced parallel relation, encapsulating said arranged wire cores in a block of plastic material, cutting through the block and the wound cores at longitudinally spaced points along planes perpendicular to the longitudinal axes of the wound cores to form a plurality of wafers each of which contains a plurality of resistance elements, and then separating said resistance elements from the plastic of the respective wafers. The disclosure also includes the steps in which prior to separating resistance elements from the plastic of the wafer, the ends of the wire cores are contacted with an etchant to etch away a portion of the ends of the wire cores, after which the ends are coated with a film of an insulating material.

Inventors

  • 👤 F Rudd
  • 👤 G Mackenzie

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 22:47
CPC Classifications
H; H01; H01C; H01C17/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49789; Y10T29/49798; Y10T29/4981; Y10T29/49812

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 117 words
A method of making electrical resistance elements comprising the steps of winding a respective resistance wire helically around and along each of a plurality of elongated wire cores which cores are coated with an insulating material, coating each of said wound cores with a protection layer, arranging said wound cores in closely spaced parallel relation, encapsulating said arranged wound cores in a block of plastic material, cutting through said block and the wound cores at longitudinally spaced points along planes perpendicular to the longitudinal axes of the wound cores to form a plurality of wafers each of which contains a plurality of resistance elements, and then separating said resistance elements from the plastic of the respective wafers.
Claim 2
Independent Claim 117 words
A method of making electrical resistance elements comprising the steps of winding a respective resistance wire helically around and along each of a plurality of elongated wire cores which cores are coated with an insulating material, coating each of said wound cores with a protection layer, arranging said wound cores in closely spaced parallel relation, encapsulating said arranged wound cores in a block of plastic material, cutting through said block and the wound cores at longitudinally spaced points along planes perpendicular to the longitudinal axes of the wound cores to form a plurality of wafers each of which contains a plurality of resistance elements, and then separating said resistance elements from the plastic of the respective wafers.
Claim 3
Dependent Claim 44 words
The method in accordance with claim 1 in which prior to separating the resistance elements from the plastic of the wafers, the ends of the wire cores are contacted with an etchant to etch away a portion of the ends of the wire cores.
Claim 4
Dependent Claim 30 words
The method in accordance with claim 2 in which after the ends of the wire cores are etched away the ends are coated with a film of an insulating material.
Claim 5
Dependent Claim 70 words
The method in accordance with claim 3 in which prior to coating the etched ends of the wire cores, a portion of the surface of each wafer is removed to expose the end portions of the protection layer on each resistance element, and the films of the insulating material coated on the etched ends of the wire cores are also coated over the exposed end portions of the protection layers.
Claim 6
Dependent Claim 40 words
The method in accordance with claim 4 in which the portion of the plastic of each wafer is removed by immersing the wafers in a solvent which dissolves the plastic but does not affect the materials of the resistance elements.
Claim 7
Dependent Claim 45 words
The method iN accordance with claim 1 in which prior to assembling the wound cores in parallel relation, a narrow opening is formed in the protection layer longitudinally along the entire length of the wound core to expose a track of the resistance wire winding.
Claim 8
Dependent Claim 22 words
The method in accordance with claim 6 in which the opening in the protection layer is formed by buffing the protection layer.

References Cited (Backward Citations)

US3252205A Cited
US3358362A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-11-25 1978-05-27 1978-11-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-11-25 1982-05-27 1982-11-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-11-25 1986-05-27 1986-11-26 $7700.00 Window Closed / Lapsed

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