US3849754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current limiting fuse
Assignee: Westinghouse Electric Corp
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Filing: 1973-10-17
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Granted: 1974-11-19
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Expires: 1993-10-17
Abstract
Abstract A fuse structure characterized by a tubular electrically insulating casing having terminal means disposed at opposite ends thereof and having an axially extending, electrically insulating support member or core centrally disposed thereof with a fusible element mounted on the core in a helical path and connected between the terminal means. The core is a segmented member comprising three longitudinal sections, the end sections of which are low temperature electrically insulating members and a center section of which is a high temperature electrically insulating member.
Inventors
- 👤 D Blewitt
- 👤 W Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:22
CPC Classifications
H; H01; H01H; H01H85/00; H01H85/02; H01H85/04; H01H85/05; H01H85/18; H01H85/185
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
96 words
A fuse structure comprising a generally tubular, electrically insulating casing, terminal means disposed adjacent to each of the opposite ends of said casing, an axially-extending, electrically insulating support member disposed in said casing with the ends disposed adjacent to the respective terminal means, a fusible element disposed in a helical path on said support member and connected between said terminal means, the insulating support member being a sgemented member comprising at least two connected longitudinal sections, one section being a high temperature electrically insulating material, and the other section being a low temperature electrically insulating material.
Claim 2
Dependent Claim
96 words
A fuse structure comprising a generally tubular, electrically insulating casing, terminal means disposed adjacent to each of the opposite ends of said casing, an axially-extending, electrically insulating support member disposed in said casing with the ends disposed adjacent to the respective terminal means, a fusible element disposed in a helical path on said support member and connected between said terminal means, the insulating support member being a sgemented member comprising at least two connected longitudinal sections, one section being a high temperature electrically insulating material, and the other section being a low temperature electrically insulating material.
Claim 3
Dependent Claim
43 words
The fuse structure of claim 1 in which there are three longitudinal sections, one of the center and end sections being the high temperature electrically insulating member, and the other of the center and end sections being the low temperature electrically insulating member.
Claim 4
Dependent Claim
17 words
The fuse structure of claim 2 in which the center section is composed of a ceramic material.
Claim 5
Dependent Claim
30 words
The fuse structure of claim 2 in which the end sections are composed of a mixture of glass-fiber and a resin selected from the group consisting of polyester and melamine.
Claim 6
Dependent Claim
15 words
The fuse structure of claim 4 in which the mixture also comprises alumina tri-hydrate filler.
Claim 7
Dependent Claim
21 words
The fuse structure of claim 2 in which the center section is disposed at substantially right angles to the end sections.
Claim 8
Dependent Claim
20 words
The fuse structure of claim 6 in which the joint between the adjacent sections comprise interfitting notches in the sections.
Claim 9
Dependent Claim
31 words
The fuse structure of claim 2 in which the end sections consist of the high temperature electrically insulating material, and the center section consists of the low temperature electrically insulating material.
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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |