Patent US3755769A successfully refreshed from Google Patents.
US3755769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modularized fuse with precise gap
Assignee: Cooper Industries LLC
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Filing: 1969-10-31
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Granted: 1973-08-28
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Expires: 1989-10-31
Abstract
Abstract This current limiting fuse has a spider type support for the main fuse element. This support has a plurality of segments joined together serially by a cement-like composition. Preferably, these segments are of lengths for establishing fuse sizes corresponding to standard design voltage ratings such as 8.3 KV, 15.5 KV, 27 KV and 38 KV. An auxiliary fuse element may be wound on the spider type support and spaced from the main fusible element. A gap separates the main fusible element and at least one end of the auxiliary element. This gap is defined by the thickness of a porous tape member that forms an effective precise gap.
Inventors
- 👤 H Mikulecky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:44
CPC Classifications
H; H01; H01H; H01H85/00; H01H85/02; H01H85/38
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
117 words
A current limiting fuse comprising: a housing, electrical connecting terminals mounted on the housing and adapted to connect the fuse into an electrical circuit, a spider extending longitudinally within the housing, a main fusible element connected to and between the electrical connecting terminals and wound around the spider, at least one conductive electrode positioned adjacent the main element, an auxiliary conductive element wound along a portion of the spider and connected at one end to the electrode, and a porous woven glass fiber tape positioned at the electrode between said electrode and the main fusible element to thereby space said electrode from said main fusible element by a distance substantially equal to the thickness of said member.
Claim 2
Dependent Claim
117 words
A current limiting fuse comprising: a housing, electrical connecting terminals mounted on the housing and adapted to connect the fuse into an electrical circuit, a spider extending longitudinally within the housing, a main fusible element connected to and between the electrical connecting terminals and wound around the spider, at least one conductive electrode positioned adjacent the main element, an auxiliary conductive element wound along a portion of the spider and connected at one end to the electrode, and a porous woven glass fiber tape positioned at the electrode between said electrode and the main fusible element to thereby space said electrode from said main fusible element by a distance substantially equal to the thickness of said member.
Claim 3
Dependent Claim
21 words
A current limiting fuse according to claim 1 wherein said tape has a thickness of about 0.003 inches to 0.005 inches.
Claim 4
Dependent Claim
129 words
A current limiting fuse comprising: a housing, electrical connecting terminals adapted to connect the fuse into an electrical circuit, a spider extending longitudinally within the housing, a main fusible element connected to the electrical connecting terminals and helically wound around the spider, two electrodes positioned adjacent the main element and spaced apart from each other along the length of the spider, an auxiliary conductive element wound along a portion of the spider and connected at one end to one electrode and at the other end to the other electrode, and a porous woven glass fiber tape positioned at each electrode between said electrode and the main fusible element to thereby space said electrode from said main fusible element by a distance substantially equal to the thickness of said member.
Claim 5
Dependent Claim
129 words
A current limiting fuse comprising: a housing, electrical connecting terminals adapted to connect the fuse into an electrical circuit, a spider extending longitudinally within the housing, a main fusible element connected to the electrical connecting terminals and helically wound around the spider, two electrodes positioned adjacent the main element and spaced apart from each other along the length of the spider, an auxiliary conductive element wound along a portion of the spider and connected at one end to one electrode and at the other end to the other electrode, and a porous woven glass fiber tape positioned at each electrode between said electrode and the main fusible element to thereby space said electrode from said main fusible element by a distance substantially equal to the thickness of said member.
Claim 6
Dependent Claim
21 words
A current limiting fuse according to claim 3 wherein said tape has a thickness of about 0.003 inches to 0.005 inches.
Claim 7
Dependent Claim
27 words
A current limiting fuse according to claim 3 wherein said auxiliary element is a fusible element having a lower melting current characteristic than the main fusible element.
References Cited (Backward Citations)
US1236584A
Cited
US2134392A
Cited
US2209823A
Cited
US2400408A
Cited
US2833890A
Cited
US3243552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |