Patent US3600801A successfully refreshed from Google Patents.
US3600801A
Expired / Lapsed
US
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Method of manufacturing an electric coil
Assignee: General Electric Co
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Filing: 1969-04-14
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Granted: 1971-08-24
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Expires: 1989-04-14
Abstract
Abstract An electric coil which is permeated with an insulating liquid varnish is manufactured by first winding a plurality of turns of insulated magnet wire about a form and then wrapping heatshrinkable tape spirally around the resulting coil such that space is left between adjacent turns of the tape. Liquidinsulating varnish is then applied to the wrapped coil in an amount which can eventually permeate the coil. The varnished, wrapped coil is then heated to cause the wrapping material to shrink and compress the heretofore loose coil so that the varnish fills the voids between adjacent turns of the coil as it is being at least partially cured.
Inventors
- 👤 Walter N Larsen
- 👤 Kenneth R Reynolds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:03
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/04; H01F41/12; H01F41/127; H01F41/125; H02; H02K; H02K3/00; H02K3/32; H02K3/325; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/4902; Y10T29/49071
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
122 words
A method of manufacturing an electric coil comprising the steps of: a. winding a plurality of turns of insulated magnet wire about a form to provide a relatively loosely wound coil; b. skip-taping a heat-shrinkable polymeric tape about the coil; c. applying an insulating liquid varnish to the wrapped coil such that the coil is permeated with the liquid varnish; and d. compressing the varnish-treated wrapped coil by the application of heat only to cause the heat-shrinkable wrapping material to shrink, the heretofore relatively loose turns of the coil being compressed by the shrinking wrapping material and the varnish filling voids between the turns of magnet wire and bonding the turns together as it is at least partially cured by the heat.
Claim 2
Independent Claim
122 words
A method of manufacturing an electric coil comprising the steps of: a. winding a plurality of turns of insulated magnet wire about a form to provide a relatively loosely wound coil; b. skip-taping a heat-shrinkable polymeric tape about the coil; c. applying an insulating liquid varnish to the wrapped coil such that the coil is permeated with the liquid varnish; and d. compressing the varnish-treated wrapped coil by the application of heat only to cause the heat-shrinkable wrapping material to shrink, the heretofore relatively loose turns of the coil being compressed by the shrinking wrapping material and the varnish filling voids between the turns of magnet wire and bonding the turns together as it is at least partially cured by the heat.
Claim 3
Dependent Claim
30 words
The method of manufacturing an electric coil according to claim 1 wherein the liquid varnish is applied To the coil by dipping the coil into a container of the varnish.
Claim 4
Dependent Claim
34 words
The method of manufacturing an electric coil according to claim 1 which includes the step of bending the wrapped coil into a desired shape before applying the insulating liquid varnish to the wrapped coil.
Claim 5
Dependent Claim
33 words
A method of manufacturing an electric coil according to claim 1 wherein the plurality of turns of insulated magnet wire are random-wound about the form and the heat-shrinkable material comprises a polymeric tape.
Claim 6
Independent Claim
112 words
The method of manufacturing an electric coil comprising the steps of: a. winding a plurality of turns of round insulated magnet wire about a form in a random manner to provide a relatively loosely wound coil; b. skip-taping a heat-shrinkable polymeric tape about the coil; c. dipping the taped coil in a container of insulating liquid varnish; and d. compressing the varnish-treated, taped coil by the application of heat only to cause the tape to shrink, the heretofore relatively loose turns of the coil being compressed and the varnish filling voids between the turns of magnet wire and bonding the turns together as it is at least partially cured by the heat.
Claim 7
Independent Claim
112 words
The method of manufacturing an electric coil comprising the steps of: a. winding a plurality of turns of round insulated magnet wire about a form in a random manner to provide a relatively loosely wound coil; b. skip-taping a heat-shrinkable polymeric tape about the coil; c. dipping the taped coil in a container of insulating liquid varnish; and d. compressing the varnish-treated, taped coil by the application of heat only to cause the tape to shrink, the heretofore relatively loose turns of the coil being compressed and the varnish filling voids between the turns of magnet wire and bonding the turns together as it is at least partially cured by the heat.
Claim 8
Dependent Claim
29 words
The method of manufacturing an electric coil according to claim 5 which also includes the step of applying an insulating, protective layer around the coil after the heating step.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |