US3913050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuse assembly for current limiting fuses
Assignee: Cooper Power Acquisition Corp
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Filing: 1974-06-03
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Granted: 1975-10-14
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Expires: 1994-06-03
Abstract
Abstract A high voltage fuse of the current limiting type including a fusible element spirally wrapped around a spider provided within the casing of the fuse and embedded with a granular inert refractory arc-quenching material, the fusible element having a plurality of reduced area sections located at spaced intervals and mounted on said spider so that the ribs of the spider contact the fusible element at points between the reduced area sections. The spider can be made of a high temperature ceramic or a gas evolving non-tracking material.
Inventors
- 👤 Harvey W Mikulecky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:13
CPC Classifications
H; H01; H01H; H01H85/00; H01H85/02; H01H85/04; H01H85/041; H01H85/042; H01H85/38; H01H2085/0225
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
89 words
A high voltage fuse of the current limiting type, a tubular insulating casing, terminals on the ends of said casing, a spider of heat resistant insulating material positioned in said casing, a fusible element having a plurality of reduced area sections, said element being helically wrapped around said spider and interconnecting said terminals, said spider contacting only portions of said fusible element at points between reduced area sections of said fusible element, and granular inert refractory, arc-quenching material within said casing embedding said spider and said main fusible element.
Claim 2
Dependent Claim
89 words
A high voltage fuse of the current limiting type, a tubular insulating casing, terminals on the ends of said casing, a spider of heat resistant insulating material positioned in said casing, a fusible element having a plurality of reduced area sections, said element being helically wrapped around said spider and interconnecting said terminals, said spider contacting only portions of said fusible element at points between reduced area sections of said fusible element, and granular inert refractory, arc-quenching material within said casing embedding said spider and said main fusible element.
Claim 3
Dependent Claim
17 words
The fuse according to claim 1 wherein said spider is formed of a gas evolving non-tracking material.
Claim 4
Dependent Claim
82 words
In a high voltage fuse of the current limiting type, a tubular insulating casing, terminals on the end of said casing and insulating support means within said casing, a main fusible element spirally wrapped about said support means and including a plurality of reduced cross sectional area sections, said main fusible element contacting said support means only at points between said reduced area sections, and granular inert refractory arc-quenching material within said casing embedding said support means and said main fusible element.
Claim 5
Dependent Claim
82 words
In a high voltage fuse of the current limiting type, a tubular insulating casing, terminals on the end of said casing and insulating support means within said casing, a main fusible element spirally wrapped about said support means and including a plurality of reduced cross sectional area sections, said main fusible element contacting said support means only at points between said reduced area sections, and granular inert refractory arc-quenching material within said casing embedding said support means and said main fusible element.
Claim 6
Dependent Claim
13 words
The fuse according to claim 3 wherein said reduced area sections comprise holes.
Claim 7
Dependent Claim
41 words
The fuse according to claim 3 wherein said support means comprise a spider having equally spaced radially extending ribs, said element being spirally wrapped around the outer periphery of said ribs with said reduced area sections being located between said ribs.
Claim 8
Dependent Claim
17 words
The fuse according to claim 3 wherein said reduced area sections are located at equally spaced intervals.
Claim 9
Dependent Claim
17 words
The fuse according to claim 3 wherein said spider is formed of a gas evolving non-tracking material.
Claim 10
Dependent Claim
23 words
The fuse according to claim 3 wherein said housing includes an electrically conductive layer on the inside and outside surfaces of said housing.
Claim 11
Dependent Claim
56 words
A fuse assembly for a sand filled high voltage fuse, said assembly comprising a heat resistant spider having equally spaced ribs, and a ribbon of fusible material having a plurality of equally spaced reduced area sections, said element being spirally wrapped around said spider with said reduced area sections located between and spaced from said ribs.
Claim 12
Dependent Claim
56 words
A fuse assembly for a sand filled high voltage fuse, said assembly comprising a heat resistant spider having equally spaced ribs, and a ribbon of fusible material having a plurality of equally spaced reduced area sections, said element being spirally wrapped around said spider with said reduced area sections located between and spaced from said ribs.
Claim 13
Dependent Claim
18 words
The fuse assembly according to claim 9 wherein said spider is formed of a gas evolving, non-tracking 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) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |