US4288837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical capacitor
Assignee: Individual
•
Filing: 1979-07-23
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Granted: 1981-09-08
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Expires: 1999-07-23
Abstract
Abstract An electrical capacitor comprising a capacitor element impregnated with a mixture of di-iso-propyl naphthalene and mono-iso-propyl naphthalene, the amount of which latter being 10% to 60% by weight, and preferably 20% to 40% by weight.
Inventors
- 👤 Mineaki Nishimatsu
- 👤 Sadayoshi Mukai
- 👤 Yoshinori Hayashi
- 👤 Osamu Yamaguchi
- 👤 Akira Ito
- 👤 Yasutoshi Hara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:11
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/22; H01G4/221; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249994; Y10T428/249995
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
37 words
An electrical capacitor comprising a capacitor element impregnated with an impregnating oil consisting essentially of a mixture of di-iso-propyl naphthalene (DIPN) and mono-iso-propyl naphthalene (MIPN), said mono-iso-propyl naphthalene being 10% to 80% by weight of said mixture.
Claim 2
Dependent Claim
37 words
An electrical capacitor comprising a capacitor element impregnated with an impregnating oil consisting essentially of a mixture of di-iso-propyl naphthalene (DIPN) and mono-iso-propyl naphthalene (MIPN), said mono-iso-propyl naphthalene being 10% to 80% by weight of said mixture.
Claim 3
Dependent Claim
16 words
The capacitor of claim 1, wherein said mixture comprises 20% to 40% by weight of MIPN.
Claim 4
Dependent Claim
16 words
The capacitor of claim 1, wherein the dielectric of said capacitor element comprises insulating paper alone.
Claim 5
Dependent Claim
18 words
The capacitor of claim 1, wherein the dielectric of said capacitor element comprises insulating paper and plastic film.
Claim 6
Dependent Claim
15 words
The capacitor of claim 4, wherein said plastic film consists of at least one sheet.
Claim 7
Dependent Claim
19 words
The capacitor of claim 4, wherein said plastic film is composed of a member selected from the polyolefin group.
Claim 8
Dependent Claim
19 words
The capacitor of claim 5, wherein said plastic film is composed of a member selected from the polyolefin group.
Claim 9
Dependent Claim
16 words
The capacitor of claim 1, wherein the dielectric of said capacitor element comprises plastic film alone.
Claim 10
Dependent Claim
19 words
The capacitor of claim 8, wherein said plastic film is composed of a member selected from the polyolefin group.
Claim 11
Dependent Claim
11 words
The capacitor of claim 7, wherein said selected member is polypropylene.
Claim 12
Dependent Claim
11 words
The capacitor of claim 9, wherein said selected member is polypropylene.
Claim 13
Dependent Claim
11 words
The capacitor of claim 9, wherein said selected member is polypropylene.
Claim 14
Dependent Claim
39 words
An electrical capacitor for subfreezing environments comprising a capacitor element impregnated with an impregnating oil consisting essentially of a mixture of di-iso-propyl naphthalene and mono-iso-propyl naphthalene, said mono-iso-propyl naphthalene being from 10% to 80% by weight of said mixture.
Claim 15
Dependent Claim
39 words
An electrical capacitor for subfreezing environments comprising a capacitor element impregnated with an impregnating oil consisting essentially of a mixture of di-iso-propyl naphthalene and mono-iso-propyl naphthalene, said mono-iso-propyl naphthalene being from 10% to 80% by weight of said mixture.
References Cited (Backward Citations)
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US3163705A
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US3640868A
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US3812407A
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US4068286A
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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) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-07 | 1993-03-09 | 1993-09-08 | $7700.00 | Window Closed / Lapsed |