US3936784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil-filled apparatus with means for achieving pressure between parts thereof
Assignee: ABB Norden Holding AB
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Filing: 1974-05-23
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Granted: 1976-02-03
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Expires: 1994-05-23
Abstract
Abstract In an oil-filled apparatus, such as a transformer, having parts between which pressure is to be applied, such pressure is produced by providing between the parts bodies of an elastomer which absorbs the oil and expands as a result of such absorption. Such bodies may be used between windings and cores or as a seal between a transformer lid and a flange.
Inventors
- 👤 Carl Elfgren
- 👤 Erich Spicar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:16
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/30; H01F27/303
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
66 words
An oil-filled apparatus having an iron core part and winding parts arranged on said core part, a casing enclosing said parts, there being a space between two of said parts, and means for exerting pressure force between said core part and said winding parts, said means comprising bodies of an elastomer which absorbs oil and swells as a result of such absorption located in said space.
Claim 2
Dependent Claim
66 words
An oil-filled apparatus having an iron core part and winding parts arranged on said core part, a casing enclosing said parts, there being a space between two of said parts, and means for exerting pressure force between said core part and said winding parts, said means comprising bodies of an elastomer which absorbs oil and swells as a result of such absorption located in said space.
Claim 3
Dependent Claim
24 words
An apparatus as claimed in claim 1, in which said apparatus is a transformer and one of said winding parts is a transformer winding.
Claim 4
Dependent Claim
17 words
An apparatus as claimed in claim 2, in which the core part is a transformer core leg.
Claim 5
Dependent Claim
16 words
An apparatus as claimed in claim 2, in which the core part is a transformer yoke.
References Cited (Backward Citations)
US3193426A
Cited
US3210648A
Cited
US3389311A
Cited
DE1564792A1
Cited
US3634798A
Cited
US3644858A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |