Patent DE715154C successfully refreshed from Google Patents.
US4054937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitor
Assignee: ABB Inc USA
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Filing: 1976-04-28
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Granted: 1977-10-18
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Expires: 1996-04-28
Abstract
Abstract A capacitor is disclosed of layers of metal foil alternating with insulating sheets impregnated with a dielectric fluid. The dielectric fluid comprises a mixture of 80 to 99% by weight mono-ethylated, mono-propylated, or mono-butylated biphenyl, biphenyl oxide, or biphenyl methane and about 1 to about 20% by weight di-ethylated, di-propylated, or di-butylated biphenyl, biphenyl oxide, or biphenyl methane.
Inventors
- 👤 Lyon Mandelcorn
- 👤 Robert L. Miller
- 👤 George E. Mercier
- 👤 John H. Pickett
- 👤 Thomas W. Dakin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:40
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/005; H01G4/012; H01B; H01B3/00; H01B3/18; H01B3/20; H01G4/018; H01G4/20; H01G4/22; H01G4/221; C; C10; C10M; C10M2203/00; C10M2203/02; C10M2203/022; C10M2203/024; C10M2203/04; C10M2203/06; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/026; C10M2207/04; C10M2207/042; C10M2207/08; C10M2211/00; C10M2211/04; C10M2211/042; C10M2211/06; C10N; C10N2040/00; C10N2040/14; C10N2040/16; C10N2040/17
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
89 words
A capacitor comprising layers of metal foil alternating with a dielectric spacer impregnated with a dielectric fluid which comprises: a. about 80 to about 99% by weight of a compound having the general formula ##STR3## or mixtures thereof, where each R is independently selected from alkyl from C 2 to C 4 ; and b. about 1 to about 20% by weight of a compound having the general formula ##STR4## or mixtures thereof, where each R 1 is independently selected from alkyl from C 2 to C 4 .
Claim 2
Dependent Claim
89 words
A capacitor comprising layers of metal foil alternating with a dielectric spacer impregnated with a dielectric fluid which comprises: a. about 80 to about 99% by weight of a compound having the general formula ##STR3## or mixtures thereof, where each R is independently selected from alkyl from C 2 to C 4 ; and b. about 1 to about 20% by weight of a compound having the general formula ##STR4## or mixtures thereof, where each R 1 is independently selected from alkyl from C 2 to C 4 .
Claim 3
Dependent Claim
16 words
A capacitor according to claim 1 wherein all R and R 1 groups are the same.
Claim 4
Dependent Claim
13 words
A capacitor according to claim 2 wherein R and R 1 are isopropyl.
Claim 5
Dependent Claim
14 words
A capacitor according to claim 2 wherein R and R 1 are normal propyl.
Claim 6
Dependent Claim
15 words
A capacitor according to claim 1 wherein said dielectric fluid contains less than 0.5% biphenyl.
Claim 7
Dependent Claim
32 words
A capacitor according to claim 1 wherein said dielectric fluid contains up to about 1% by weight of an anti-oxidant and up to about 1% by weight of a hydrogen acceptor compound.
Claim 8
Dependent Claim
34 words
A capacitor according to claim 1 wherein said dielectric fluid contains about 0.01 to about 0.5% by weight of an anti-oxidant selected from the group consisting of di-t-butyl paracresol, di-t-butyl phenol, and mixtures thereof.
Claim 9
Dependent Claim
16 words
A capacitor according to claim 1 which contains up to 2% of a hydrogen acceptor compound.
Claim 10
Dependent Claim
22 words
A capacitor according to claim 8 wherein said dielectric fluid contains about 0.1 to about 0.5% by weight of an anthraquinone compound.
Claim 11
Dependent Claim
12 words
A capacitor according to claim 9 wherein said anthraquinone compound is β-methylanthraquinone.
Claim 12
Dependent Claim
19 words
A capacitor according to claim 1 wherein said dielectric fluid includes about 0.05 to about 1% of an epoxy.
Claim 13
Dependent Claim
19 words
A capacitor according to claim 1 wherein said dielectric spacer consists of paper, paper and film, or 100% film.
Claim 14
Dependent Claim
16 words
A capacitor according to claim 1 wherein every other layer of said metal foil is narrower.
Claim 15
Dependent Claim
18 words
A capacitor according to claim 13 wherein each layer of metal foil which is narrower has rounded edges.
Claim 16
Dependent Claim
20 words
A capacitor according to claim 1 wherein said compounds in parts (a) and (b) have the general formulae ##STR5## respectively.
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) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |