US4540970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit breaking element
Assignee: Individual
•
Filing: 1984-02-29
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Granted: 1985-09-10
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Expires: 2004-02-29
Abstract
Abstract A circuit breaking element comprising an electrically insulating base member, an organic insulation layer having a low melting point and formed over the surface of the base member, and a metal resistance coating layer formed over the surface of the insulation layer. When the metal resistance coating layer is thermally broken by excessive current passing therethrough, the coating layer completely separates into two portions at opposite sides of the break to completely break a circuit.
Inventors
- 👤 Mikizo Kasamatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:16
CPC Classifications
H; H01; H01H; H01H85/00; H01H85/02; H01H85/04; H01H85/041; H01H85/046; H01H85/0039; H01H85/0073
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
114 words
A fuse comprising a circuit breaking element comprising an electrically insulating tubular base member, an organic insulation layer having a low melting point and formed over the surface of the tubular base member, and a metal resistance coating layer formed over the surface of the insulation layer, electrically conductive caps each connected to a lead wire fixedly fitted over opposite ends of said circuit breaking element so as to contact said metal resistance coating layer and electrically interconnect it to the lead wires, the resulting assembly being fixedly enclosed in an electrically insulating cover so that a clearance is formed between the cover and the metal resistance coating layer of said circuit breaking element.
Claim 2
Dependent Claim
114 words
A fuse comprising a circuit breaking element comprising an electrically insulating tubular base member, an organic insulation layer having a low melting point and formed over the surface of the tubular base member, and a metal resistance coating layer formed over the surface of the insulation layer, electrically conductive caps each connected to a lead wire fixedly fitted over opposite ends of said circuit breaking element so as to contact said metal resistance coating layer and electrically interconnect it to the lead wires, the resulting assembly being fixedly enclosed in an electrically insulating cover so that a clearance is formed between the cover and the metal resistance coating layer of said circuit breaking element.
Claim 3
Dependent Claim
28 words
A fuse as defined in claim 1 wherein the organic insulation layer of low melting point is formed over the entire surface of the electrically insulating base member.
Claim 4
Dependent Claim
28 words
A fuse as defined in claim 1 wherein the organic insulation layer of low melting point is partly formed on the surface of the electrically insulating base member.
References Cited (Backward Citations)
US4031497A
Cited
US4246563A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-09 | 1989-03-11 | 1989-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-09 | 1993-03-11 | 1993-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-09 | 1997-03-11 | 1997-09-10 | $7700.00 | Window Closed / Lapsed |