US4751489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subminiature fuses
Assignee: Cooper Industries LLC
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Filing: 1986-08-18
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Granted: 1988-06-14
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Expires: 2006-08-18
Abstract
Abstract A subminiature fuse comprising two terminals, a substrate, a fusible conductor, ceramic coating, a second coating and a unitary housing. A ceramic substrate 80 plated at both ends is inserted into fingers (70) in terminal, a fusible wire element 10 is strung between the fingers (70) and (20, 30) and electrically connects the terminal (20, 30). The assembly 160 is encased in a ceramic adhesive 180 which is encased in a second material (200) with superior dielectric properties. The ceramic encased assembly is enclosed in a unitary housing by injection molding.
Inventors
- 👤 Vernon Spaunhorst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:15
CPC Classifications
H; H01; H01H; H01H85/00; H01H85/02; H01H85/04; H01H85/041; H01H85/0411; H01H85/0415; H01H85/0417; H01H85/0013; H01H85/0021; H01H2085/0034; H01H85/003
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
82 words
A subminiature fuse comprising: (a) two terminals; (b) substrate, comprised of a material that will not carbonize at high temperature, mechanically linking said two terminals; (c) a fusible element supported on said substrate and electrically linking said two terminals; (d) a first coating encasing said fusible element substrate and an upper end of said terminals; (e) a second coating, having good dielectric strength, at least partially encasing said first coating; and (f) a housing surrounding at least partially encasing said second coating.
Claim 2
Dependent Claim
82 words
A subminiature fuse comprising: (a) two terminals; (b) substrate, comprised of a material that will not carbonize at high temperature, mechanically linking said two terminals; (c) a fusible element supported on said substrate and electrically linking said two terminals; (d) a first coating encasing said fusible element substrate and an upper end of said terminals; (e) a second coating, having good dielectric strength, at least partially encasing said first coating; and (f) a housing surrounding at least partially encasing said second coating.
Claim 3
Dependent Claim
13 words
A subminiature fuse as in claim 1 wherein said substrate has an aperture.
Claim 4
Dependent Claim
15 words
A subminiature fuse as in claim 1 wherein said first coating is a ceramic material.
Claim 5
Dependent Claim
26 words
A subminiature fuse as in claim 1 wherein said first coating is selected from a group comprised of stone sand, waterglass or other adhesively bound fillers.
Claim 6
Dependent Claim
14 words
A subminiature fuse as in claim 1 wherein said second coating is Boron Nitrate.
Claim 7
Dependent Claim
25 words
A subminiature fuse as in claim 1 wherein said second coating is selected from a group comprised of Boron Silicate, Boron Oxide or Boron Nitrate.
Claim 8
Dependent Claim
16 words
A subminiature fuse as in claim 1 wherein said second coating is built up in layers.
References Cited (Backward Citations)
US3110787A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |