Patent US3831234A successfully refreshed from Google Patents.
US3831234A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing an electrical capacitor
Assignee: Cooper Industries LLC
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Filing: 1973-04-06
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Granted: 1974-08-27
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Expires: 1993-04-06
Abstract
Abstract A power factor correction capacitor is constructed of several capacitor packs, each having convolutely wound layers of aluminum foil and polypropylene film with two layers of polypropylene film between the layers of foil. The several capacitor packs are assembled into a case and impregnated with trichlorodiphenyl with a bis (3, 4-epoxy-6-methylcyclohexylmethyl) adipate as an additive. During the winding process the foil is deformed by a deforming roller rolled against the roll of foil as it is wound into the capacitor pack.
Inventors
- 👤 J Lapp
- 👤 N Weiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:39
CPC Classifications
H; H01; H01G; H01G13/00; H01G13/02; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/22; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
21 words
A method according to claim 1 wherein said step of impregnating comprises impregnating with a dielectric liquid having a stabilizing additive.
Claim 2
Dependent Claim
22 words
A method according to claim 2 wherein said step of impregnating comprises impregnating with a halogenated aromatic liquid having an epoxide additive.
Claim 3
Dependent Claim
14 words
A method according to claim 3 wherein said aromatic compound is a chlorinated diphenyl.
Claim 4
Dependent Claim
20 words
A method according to claim 1 also comprising placing the capacitor pack under vacuum prior to the step of impregnating.
Claim 5
Dependent Claim
32 words
A method according to claim 5 also comprising placing the capacitor pack at a temperature of about 80*-90* F for a selected period of time after placing said capacitor pack under vacuum.
Claim 6
Dependent Claim
25 words
A method according to claim 6 wherein said force is selected to produce a random range of depth of deformations with some deformations creating perforations.
Claim 7
Dependent Claim
17 words
A method according to claim 1 wherein said step of deforming comprises deforming both strips of foil.
Claim 8
Dependent Claim
25 words
A method according to claim 8 wherein said force is selected to produce a random range of depth of deformations with some deformations creating perforations.
Claim 9
Dependent Claim
24 words
A method according to claim 9 wherein said force is selected to produce a perforation range of about twenty per cent of the deformations.
Claim 10
Dependent Claim
24 words
A method according to claim 10 wherein said deformations are of varying depth up to a maximum of about the magnitude of six mils.
Claim 11
Dependent Claim
28 words
A method according to claim 11 wherein said raised points are positioned to produce rows of indentations having random depths of indentations and a random percentage of perforation.
Claim 12
Dependent Claim
24 words
A method according to claim 12 wherein said step of deforming comprises creating perforations in about twenty to fifty per cent of the indentations.
Claim 13
Dependent Claim
20 words
A method according to claim 12 also comprising placing the capacitor pack under vacuum prior to the step of impregnating.
Claim 14
Dependent Claim
32 words
A method according to claim 14 also comprising placing the capacitor pack at a temperature of about 80*-90* F for a selected period of time after placing the capacitor pack under vacuum.
Claim 15
Dependent Claim
35 words
A method according to claim 15 wherein said step of deforming comprises applying a deforming roller having points positioned on said roller to produce rows of indentations spaced apart by about one-fourteenth of an inch.
Claim 16
Dependent Claim
20 words
A method according to claim 8 also comprising placing the capacitor pack under vacuum prior to the step of impregnating.
Claim 17
Dependent Claim
25 words
A method according to claim 17 also comprising placing the capacitor pack at a temperature of about 80*-90* F prior to the step of impregnating.
Claim 18
Dependent Claim
24 words
A Method according to claim 18 wherein said deformations are of varying depth up to a maximum of about the magnitude of six mils.
Claim 19
Dependent Claim
22 words
A method according to claim 19 wherein said step of deforming comprises creating perforations in about twenty per cent of the indentations.
Claim 20
Dependent Claim
40 words
A method according to claim 20 wherein said raised points are positioned and said force selected to produce rows of indentations having randomly determined depths of indentations within a selected range of depth and with a selected percentage of perforation.
Claim 21
Dependent Claim
20 words
A method according to claim 2 also comprising placing the capacitor pack under vacuum prior to the step of impregnating.
Claim 22
Dependent Claim
25 words
A method according to claim 22 also comprising placing the capacitor pack at a temperature of about 80*-90* F prior to the step of impregnating.
Claim 23
Dependent Claim
40 words
A method according to claim 8 wherein said raised points are positioned and said force selected to produce rows of indentations having randomly determined depths of indentations within a selected range of depth and with a selected percentage of perforation.
Claim 24
Dependent Claim
20 words
A method according to claim 24 also comprising placing the capacitor pack under vacuum prior to the step of impregnating.
Claim 25
Dependent Claim
33 words
A method according to claim 25 also comprising placing the capacitor pack at a temperature of about 80*-90* F following the step of placing under vacuum and prior to the step of impregnating.
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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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |