Patent US3735168A successfully refreshed from Google Patents.
US3735168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High voltage insulated coil and machine utilizing the same
Assignee: Portec Inc
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Filing: 1971-12-20
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Granted: 1973-05-22
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Expires: 1991-12-20
Abstract
Abstract An improved insulated coil for an electrodynamic machine is prepared by wrapping multiple layers of a wide insulative wrapper around the straight section of the coil, in overlapping contact with a narrow insulative tape applied on the end portion of the coil. The wrapped coil is then vacuum-pressure impregnated with a liquid, heat-reactive resin, and the coil is then heat and pressure treated to cure the liquid resin impregnate to a permanent, solid set and to form thereby an insulated coil with a continuous, unitary insulative joint between the wrapper and the tape.
Inventors
- 👤 R Anderson
- 👤 M Fromm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:27
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/12; H02K3/00; H02K3/32
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
122 words
An insulated coil for an electrodynamic machine, said coil comprising one or more straight sections and one or more return bent sections, one or more turns of insulated wrapping on said coil, a portion of said wrapping being on said straight sections and comprising the finish cured product of a liquid resin impregnated wrapper of a width sufficient to cover at least a substantial segment of the entire length of said straight section of said coil, and a portion of said wrapping being on said return bent sections and comprising the finish cured product of a liquid resinimpregnated tape, said tape being contiguous with said wrapper and both said tape and said wrapper being impregnated with said liquid resin by vacuum-pressure impregnation.
Claim 2
Dependent Claim
122 words
An insulated coil for an electrodynamic machine, said coil comprising one or more straight sections and one or more return bent sections, one or more turns of insulated wrapping on said coil, a portion of said wrapping being on said straight sections and comprising the finish cured product of a liquid resin impregnated wrapper of a width sufficient to cover at least a substantial segment of the entire length of said straight section of said coil, and a portion of said wrapping being on said return bent sections and comprising the finish cured product of a liquid resinimpregnated tape, said tape being contiguous with said wrapper and both said tape and said wrapper being impregnated with said liquid resin by vacuum-pressure impregnation.
Claim 3
Dependent Claim
26 words
The coil of claim 1 wherein said wrapper is of a width sufficient to cover substantially the entire length of said straight section of said coil.
Claim 4
Dependent Claim
27 words
The coil of claim 1 wherein said wrapper is of a width sufficient to cover at least about one-third of the entire length of said straight section.
Claim 5
Dependent Claim
16 words
An improved electrodynamic machine, the improvement comprising the coils of claim 1 contained within said machine.
Claim 6
Dependent Claim
24 words
The coil of claim 2 wherein said impregnating liquid resin is selected from the class consisting of epoxy resins, polyester resins and mixtures thereof.
Claim 7
Dependent Claim
17 words
The coil of claim 2 wherein said wrapper and said tape contain mica as an insulating medium.
Claim 8
Dependent Claim
28 words
The coil of claim 6 whErein said mica comprises at least 50 percent by weight of said wrapper and at least 50 percent by weight of said tape.
Claim 9
Dependent Claim
42 words
The coil of claim 2 wherein said return bent portion of said coil includes a knuckle portion, and said knuckle portion has wrapped along at least a portion of its length a fully cured tape which is contiguous to said resin-impregnated tape.
Claim 10
Dependent Claim
44 words
The coil of claim 2 wherein said wrapper is telescoped at the edges thereof so that successive widths of diminishing numbers of layers of wrapper appear at each end thereof, and said tape is in overlapping relationship to said telescoped ends of said wrapper.
Claim 11
Dependent Claim
119 words
An electrodynamic machine having one or more insulated coils contained therein, each of said coils comprising one or more straight sections and one or more return-bent sections, an insulative wrapping on said coil, said wrapping comprising the finish-cured product of one or more turns of a liquid-resin-impregnated wrapper of a width sufficient to substantially cover the entire length of said straight section of said coil, and one or more turns of the finish cured product of a liquid resin-impregnated tape wrapped around a portion at least of said return-bent portion, said wrapper and said tape being in overlapping relationship at their respective edges and both said wrapper and said tape being impregnated with said liquid resin by vacuum-pressure impregnation.
Claim 12
Dependent Claim
119 words
An electrodynamic machine having one or more insulated coils contained therein, each of said coils comprising one or more straight sections and one or more return-bent sections, an insulative wrapping on said coil, said wrapping comprising the finish-cured product of one or more turns of a liquid-resin-impregnated wrapper of a width sufficient to substantially cover the entire length of said straight section of said coil, and one or more turns of the finish cured product of a liquid resin-impregnated tape wrapped around a portion at least of said return-bent portion, said wrapper and said tape being in overlapping relationship at their respective edges and both said wrapper and said tape being impregnated with said liquid resin by vacuum-pressure impregnation.
Claim 13
Dependent Claim
21 words
The machine of claim 10 wherein said liquid resin is selected from the class consisting of epoxy, polyester, and mixtures thereof.
Claim 14
Dependent Claim
14 words
The machine of claim 10 further including layers of finishing tape over said wrapping.
Claim 15
Dependent Claim
18 words
The machine of claim 12 further including a coating of baked varnish on said layers of finishing tape.
Claim 16
Dependent Claim
38 words
The machine of claim 10 wherein said return bent sections have knuckle portions and said knuckle portions have wrapped along at least a portion of their length a fully cured tape which is contiguous to said resin-impregnated tape.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |