US3684932A
Expired / Lapsed
US
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Electrical capacitors with amide impregnants
Assignee: Sprague Electric Co
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Filing: 1971-11-04
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Granted: 1972-08-15
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Expires: 1991-11-04
Abstract
Abstract Mono-N-substituted and di-N-substituted amides are advantageously used for dielectric oil applications. The appropriate substitution provides the amides with the required physical and electrical characteristics necessary for use as a dielectric liquid in AC and energy storage capacitors.
Inventors
- 👤 Sidney D Ross
- 👤 Manuel Finkelstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:07
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/22; H01G4/221; H01G4/06; H01G4/14; H01G4/18; H01G4/32
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
57 words
The capacitor of claim 1 wherein said liquid dielectric is at least one alkyl substituted amide of the formula wherein R1 is a C1-C18 alkyl group; R2 is a member selected from CH3 and C2H5; R3 is a member selected from CH3 and H; and R4 is a member selected from H and a C1-C18 alkyl group.
Claim 2
Dependent Claim
19 words
The capaciTor of claim 1 wherein said liquid dielectric is at least one alkyl substituted amide of the formula
Claim 3
Dependent Claim
19 words
The capacitor of claim 1 wherein said liquid dielectric is at least one alkyl substituted amide of the formula
Claim 4
Dependent Claim
19 words
The capacitor of claim 1 wherein said liquid dielectric is at least one alkyl substituted amide of the formula
Claim 5
Dependent Claim
71 words
The capacitor of claim 1 wherein said liquid dielectric is at least one alkyl substituted amide of the formula wherein R1 is a hydrocarbon grouping selected from the group consisting of alkyl and aryl; R2 is a C1-C18 alkyl group; R3 is a member selected from CH3 and C2H5; R4 is a member selected from CH3 and H; and R5 is a member selected from H and a C1-C18 alkyl group.
Claim 6
Dependent Claim
57 words
The capacitor of claim 1 wherein said liquid dielectric is at least one alkyl substituted amide of the formula wherein R1 is a C1-C18 alkyl group; R2 is a member selected from CH3 and C2H5; R3 is a member selected from CH3 and H; and R4 is a member selected from H and a C1-C18 alkyl group.
Claim 7
Dependent Claim
23 words
The capacitor of claim 1 wherein said electrodes are in the form of a thin metallization on each surface of a porous paper.
Claim 8
Dependent Claim
37 words
The capacitor of claim 1 wherein said dielectric spacer is a polyolefin film, and wherein at least one of said electrodes is in the form of a metallized layer deposited on a surface of said polyolefin film.
Claim 9
Dependent Claim
11 words
The capacitor of claim 9 wherein said metallized layer is aluminum.
References Cited (Backward Citations)
US3363156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |