Patent US3670276A successfully refreshed from Google Patents.
US3670276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hermetic transformer
Assignee: LTV LING ALTEC Inc
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Filing: 1971-02-11
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Granted: 1972-06-13
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Expires: 1991-02-11
Abstract
Abstract A hermetically-sealed completely oil-filled high voltage transformer of small size and rugged construction for use over a wide range of ambient temperature and ambient pressure. Required expansion bellows are desirably small because interstices between the core-coil structure and the enclosing case are filled with at least one insulating piece and numerous refractory beads in addition to oil. The oil is restricted to the internal volume that is under high electrical stress.
Inventors
- 👤 Charles Theodore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:31
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
122 words
A hermetically-sealed inductive device comprising; a. a ferromagnetic core (11-14), b. a coil (8) having at particular areas a different electrical potential than that of said core, said coil mounted on said core, c. an enclosing case (1, 2). d. a mechanically expansive member (4) hermetically sealed to said case, e. at least one shaped insulating piece (20 and/or 21) fitted between said case and the core-coil structure and shaped to avoid said particular areas, f. refractory particles (38), small with respect to other elements of said inductive device, disposed in interstices between said other elements, and g. an electrical-insulative liquid (30), completely filling remaining interstices within said enclosing case to provide insulation for the coil structure, particularly at said particular areas.
Claim 2
Dependent Claim
122 words
A hermetically-sealed inductive device comprising; a. a ferromagnetic core (11-14), b. a coil (8) having at particular areas a different electrical potential than that of said core, said coil mounted on said core, c. an enclosing case (1, 2). d. a mechanically expansive member (4) hermetically sealed to said case, e. at least one shaped insulating piece (20 and/or 21) fitted between said case and the core-coil structure and shaped to avoid said particular areas, f. refractory particles (38), small with respect to other elements of said inductive device, disposed in interstices between said other elements, and g. an electrical-insulative liquid (30), completely filling remaining interstices within said enclosing case to provide insulation for the coil structure, particularly at said particular areas.
Claim 3
Dependent Claim
24 words
The sealed device of claim 1 in which; a. said mechanically expansible member is a spring bellows (4), maintaining pressure upon said electrical-insulative liquid.
Claim 4
Dependent Claim
24 words
The sealed device of claim 2 in which; a. said bellows have a relaxed configuration which reduces the interior volume of said enclosing case.
Claim 5
Dependent Claim
35 words
The sealed device of claim 1 in which; a. the said at least one insulating piece is shaped to fill substantially half of the total volume existing between said core-coil structure and the enclosing case.
Claim 6
Dependent Claim
50 words
The sealed device of claim 1 in which; a. one said insulating piece having a coefficient of expansion less than that of said electrical-insulative liquid is employed on each side of said core-coil structure to substantially fill the volume between that structure and the adjacent side of the enclosing case.
Claim 7
Dependent Claim
42 words
The sealed device of claim 1 in which; a. the said at least one insulating piece is molded in one piece to substantially fill the volume between the core-coil structure, save that part of said coil (8) having said different electrical potential.
Claim 8
Dependent Claim
18 words
The sealed device of claim 1 in which; a. said refractory particles (28) are essentially spherical in shape.
Claim 9
Dependent Claim
20 words
The sealed device of claim 1 in which; a. each of said refractory particles (28) are essentially the same size.
Claim 10
Dependent Claim
15 words
The sealed device of claim 1 in which; a. said electrical-insulative liquid is transformer oil.
Claim 11
Dependent Claim
27 words
The sealed device of claim 1 in which; a. the expansibility of said mechanically expansible member (4) increases the volume within said enclosing case by approximately one-fifth.
Claim 12
Dependent Claim
28 words
The sealed device of claim 1 which additionally includes; a. a cylindrical extension (3) to said enclosing case (1) to which said mechanically expansible member (4) is attached.
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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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |