Patent US567884A successfully refreshed from Google Patents.
Patent US3601737A successfully refreshed from Google Patents.
US3601737A
Expired / Lapsed
US
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Fuse elements for dc interruption
Assignee: General Electric Co
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Filing: 1969-10-09
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Granted: 1971-08-24
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Expires: 1989-10-09
Abstract
Abstract A current-limiting fuse having a silicon rubber arc constricting structure encapsulating certain portions of the link having reduced cross-sectional areas. By confining and constructing the arc within the structure, the chance of creation of deleterious shunt current paths is minimized. The method disclosed encompasses flowing a still vicous room temperature vulcanized silicon rubber over a reduced portion of the fuse link to encapsulate the portion.
Inventors
- 👤 Leslie L Baird
- 👤 Ernest H Bogert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:11
CPC Classifications
H; H01; H01H; H01H85/00; H01H85/02; H01H85/04; H01H85/05; H01H85/055
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
123 words
An electric fuse of the current-limiting type which during interruption generates a high arc voltage thus minimizing the effects of fault currents comprising: a. a tubular insulating casing; b. a pulverulent filler inside said casing; c. an elongated fuse link in said casing, said link having first, second and third longitudinally spaced portions of reduced cross-sectional area, the second portion being directly exposEd to said filler, and d. insulating encapsulating means completely surrounding and in immediate contact with said first and third reduced portions of said link and isolating said first and third portions of said link from said filler thereby substantially precluding the formation of conductive fulgurite in the region of said first and third reduced portions of said link during interruption.
Claim 2
Dependent Claim
123 words
An electric fuse of the current-limiting type which during interruption generates a high arc voltage thus minimizing the effects of fault currents comprising: a. a tubular insulating casing; b. a pulverulent filler inside said casing; c. an elongated fuse link in said casing, said link having first, second and third longitudinally spaced portions of reduced cross-sectional area, the second portion being directly exposEd to said filler, and d. insulating encapsulating means completely surrounding and in immediate contact with said first and third reduced portions of said link and isolating said first and third portions of said link from said filler thereby substantially precluding the formation of conductive fulgurite in the region of said first and third reduced portions of said link during interruption.
Claim 3
Dependent Claim
54 words
pouring further elastomeric insulating material, while viscous, over said reduced portion of said link and said base so that said elastomeric material surrounds and contacts substantially all surfaces of said reduced portion of said link, and c. disposing said link in a casing between a pair of conductive terminals and in a pulverulent filler.
Claim 4
Dependent Claim
54 words
pouring further elastomeric insulating material, while viscous, over said reduced portion of said link and said base so that said elastomeric material surrounds and contacts substantially all surfaces of said reduced portion of said link, and c. disposing said link in a casing between a pair of conductive terminals and in a pulverulent filler.
Claim 5
Dependent Claim
18 words
A current-limiting fuse of the type specified in claim 1 wherein said insulating encapsulating means comprises silicone rubber.
Claim 6
Dependent Claim
21 words
A current-limiting fuse of the type specified in claim 2 wherein said silicone rubber is of the room temperature vulcanized class.
Claim 7
Independent Claim
66 words
The method of making an improved current-limiting fuse comprising the steps of: a. providing an electrically conductive link having at least one portion reduced in cross-sectional area; b. completely encapsulating said reduced portion in an insulating material such that said material is in an immediate contacting relationship with substantially all surfaces of said reduced portion of said link, said encapsulation being accomplished by the steps of:
Claim 8
Independent Claim
66 words
The method of making an improved current-limiting fuse comprising the steps of: a. providing an electrically conductive link having at least one portion reduced in cross-sectional area; b. completely encapsulating said reduced portion in an insulating material such that said material is in an immediate contacting relationship with substantially all surfaces of said reduced portion of said link, said encapsulation being accomplished by the steps of:
Claim 9
Dependent Claim
22 words
The method of making an improved current-limiting fuse element as specified in claim 4 wherein said elastomeric insulating material comprises silicone rubber.
Claim 10
Dependent Claim
26 words
The method of making an improved current-limiting fuse element as specified in claim 5 wherein said viscous elastomeric insulating material comprises room temperature vulcanized silicone rubber.
References Cited (Backward Citations)
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US2866038A
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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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |