US3769698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a photoetched induction coil
Assignee: Bendix Corp
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Filing: 1972-12-26
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Granted: 1973-11-06
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Expires: 1992-12-26
Abstract
Abstract An induction coil assembly includes circuits photoetched on metallic laminates bonded to a flexible substrate. The substrate is wound on an arbor and pinned, after which it is removed from the arbor, impregnated and machined to provide an induction coil having close mechanical and electrical tolerances.
Inventors
- 👤 E Lademann
- 👤 Connor J O
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:31
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/04; H01F41/041; H01F5/00; H01F5/003; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0393; H05K1/16; H05K1/165; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
75 words
A method for manufacturing a coil assembly comprising: providing a continuous, flexible substrate; applying conductive circuit patterns to both sides of the substrate; connecting the circuit patterns on one side of the substrate with those on the other side; winding the substrate having the connected circuit patterns thereon into a coil having a plurality of turns with predetermined spaces between said turns; and impregnating the wound coil to fill said spaces with an insulating material.
Claim 2
Independent Claim
75 words
A method for manufacturing a coil assembly comprising: providing a continuous, flexible substrate; applying conductive circuit patterns to both sides of the substrate; connecting the circuit patterns on one side of the substrate with those on the other side; winding the substrate having the connected circuit patterns thereon into a coil having a plurality of turns with predetermined spaces between said turns; and impregnating the wound coil to fill said spaces with an insulating material.
Claim 3
Dependent Claim
41 words
A method as described by claim 1, wherein the step of applying conductive circuit patterns to both sides of the substrate includes: laminating both sides of the substrate with a conductive metal; and photoetching the circuit patterns on the metallic laminations.
Claim 4
Dependent Claim
76 words
A method as described by claim 2, wherein the step of connecting the circuit patterns on the one side of the substrate with those on the other side includes: drilling holes through the laminated substrate along the length thereof; plating the through holes with a conductive metal; and photoetching the circuit patterns so that said patterns on one side of the substrate are connected by the plated through holes to the patterns on the other side.
Claim 5
Dependent Claim
39 words
A method as described by claim 1 which also includes: providing locating tabs at predetermined points along the length of the substrate; and winding the substrate on an arbor with the locating tabs in alignment for providing said spaces.
Claim 6
Dependent Claim
49 words
A method as described by claim 4, including: drilling holes through the locating tabs; inserting a pin through the holes to prevent unwinding when the substrate is wound on the arbor with the locating tabs in alignment; and removing the pinned, wound coil from the arbor prior to impregnating.
Claim 7
Dependent Claim
20 words
A method as described by claim 5, including: removing the pin and locating tabs and machining the coil after impregnating.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |