US4873506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallo-organic film fractional ampere fuses and method of making
Assignee: Cooper Technologies Co
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Filing: 1988-03-09
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Granted: 1989-10-10
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Expires: 2008-03-09
Abstract
Abstract A fractional amp fuse (10) with a thin film fusible element (16) connecting thick film pads (14) supported by a polished insulating substrate (12). The fuse subassembly has leads (24) attached by resistance welding and is encapsulated in a ceramic insulating material (18). The entire fuse is enclosed in a plastic-like material (20).
Inventors
- 👤 Leon Gurevich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:10
CPC Classifications
H; H01; H01H; H01H85/00; H01H85/02; H01H85/04; H01H85/041; H01H85/046; H01H85/0013; H01H85/0021; H01H2085/0034; H01H85/0411; H01H2085/0412; H01H2085/0414; H01H85/003; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49107
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
66 words
A method of making a fuse element subassembly comprising the steps of: providing a support means of insulating material; providing said support means with metallized areas so that said support means has a least two separate metallized areas; and printing a metallo-organic ink on said support means and firing to provide a thin film fusible element on said support means to electrically connect said metallized areas.
Claim 2
Independent Claim
66 words
A method of making a fuse element subassembly comprising the steps of: providing a support means of insulating material; providing said support means with metallized areas so that said support means has a least two separate metallized areas; and printing a metallo-organic ink on said support means and firing to provide a thin film fusible element on said support means to electrically connect said metallized areas.
Claim 3
Dependent Claim
27 words
A method of making a fuse subassembly as in claim 1 wherein said support means is selected from a group comprised of ceramic, glass, alumina and forstreite.
Claim 4
Dependent Claim
30 words
A method of making a fuse element subassembly as in claim 1 wherein said support means is capable of withstanding a temperature required to fire the thin film fusible element.
Claim 5
Dependent Claim
24 words
A method of making a fuse element subassembly as in claim 1 wherein said support means has a surface finish smoother than 2-3 micro-inches.
Claim 6
Independent Claim
19 words
A method of making a fuse element subassembly as in claim I wherein said support means is glazed ceramic.
Claim 7
Dependent Claim
38 words
A fuse element subassembly comprising: a support means of insulating material; at least two metallized areas on said support means; and a fired metallo-organic thin film ink fusible element on said support means electrically connecting said metallized areas.
Claim 8
Dependent Claim
38 words
A fuse element subassembly comprising: a support means of insulating material; at least two metallized areas on said support means; and a fired metallo-organic thin film ink fusible element on said support means electrically connecting said metallized areas.
Claim 9
Dependent Claim
26 words
A fuse element subassembly as in claim 6 wherein the thickness of said fusible element varies inversely with irregularities on the surface of said support means.
Claim 10
Dependent Claim
24 words
A fuse element subassembly as in claim 6 wherein said support means is selected from a group comprised of ceramic, glass, alumina and forsterite.
Claim 11
Dependent Claim
21 words
A fuse element subassembly as in claim 8 wherein said support means has a surface finish smoother than 2-3 micro inches.
Claim 12
Dependent Claim
27 words
A fuse element subassembly as in claim 6 wherein a coating material of low thermal conductivity is applied between said support means and said thin film element.
Claim 13
Dependent Claim
15 words
A fuse element subassembly as in claim 6 wherein said support means is glazed ceramic.
Claim 14
Dependent Claim
19 words
A fuse element subassembly as in claim 6 wherein said fusible element is less than 100 micro inches thick.
Claim 15
Dependent Claim
19 words
A fuse element subassembly as in claim 11 wherein said fusible element is less than 100 micro inches thick.
Claim 16
Dependent Claim
22 words
A fuse element subassembly as in claim 6 wherein said fusible element has a sheet resistivity of between 100-1000 microohms per square.
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) | 1992-10-09 | 1993-04-10 | 1993-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-09 | 1997-04-10 | 1997-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-09 | 2001-04-10 | 2001-10-10 | $7700.00 | Window Closed / Lapsed |