US5663702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
PTC electrical device having fuse link in series and metallized ceramic electrodes
Assignee: Littelfuse Inc
•
Filing: 1995-06-07
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Granted: 1997-09-02
•
Expires: 2015-06-07
Abstract
Abstract Electrical devices with a PTC element including a polymer having conductive particles dispersed therein and at least one metallized ceramic electrode. The devices are made by dispersing conductive particles into a polymer to form a polymer PTC composition. The metallized ceramic electrodes include a ceramic substrate having a conductive layer deposited on its surface. The metallized ceramic electrodes are brought into contact with the PTC element, and heated while applying pressure to form a laminate. The laminate is then diced into a plurality of PTC electrical circuit protection devices.
Inventors
- 👤 Philip C. Shaw, Jr.
- 👤 Paul Charles Stein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:06
CPC Classifications
H; H01; H01C; H01C1/00; H01C1/14; H01C1/1406; H01C7/00; H01C7/02; H01C7/027; H01H; H01H85/00; H01H85/02; H01H85/46; H01H85/463; H01H85/04; H01H85/041; H01H85/048; H01H2085/0483
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
161 words
An electrical fuse assembly including a plurality of electrical circuit protection devices which can be used to protect a number of electrical circuits, the fuse assembly comprising: a first and second substrate, each substrate having an inner surface and an outer surface; a plurality of conductive terminal pads deposited on the outer surfaces of the first and second substrates; a plurality of fuse links deposited on the outer surface of the first substrate; a plurality of first conductive layers deposited on the inner surface of the first substrate; a plurality of second conductive layers deposited on the inner surface of the second substrate; a plurality of PTC elements interposed between the first and second substrates, each PTC element in electrical contact with a single first conductive layer and a single second conductive layer, each PTC element also electrically connected in series with a single fuse link; and, the PTC elements electrically insulated from one another by a plurality of dividing substrates.
Claim 2
Dependent Claim
161 words
An electrical fuse assembly including a plurality of electrical circuit protection devices which can be used to protect a number of electrical circuits, the fuse assembly comprising: a first and second substrate, each substrate having an inner surface and an outer surface; a plurality of conductive terminal pads deposited on the outer surfaces of the first and second substrates; a plurality of fuse links deposited on the outer surface of the first substrate; a plurality of first conductive layers deposited on the inner surface of the first substrate; a plurality of second conductive layers deposited on the inner surface of the second substrate; a plurality of PTC elements interposed between the first and second substrates, each PTC element in electrical contact with a single first conductive layer and a single second conductive layer, each PTC element also electrically connected in series with a single fuse link; and, the PTC elements electrically insulated from one another by a plurality of dividing substrates.
Claim 3
Dependent Claim
16 words
An electrical fuse assembly according to claim 1, wherein the first and second substrate comprise ceramic.
Claim 4
Dependent Claim
32 words
An electrical fuse assembly according to claim 1, wherein the first and second substrate are comprised of a material selected from the group consisting essentially of alumina, silica, beryllia, and aluminum nitride.
Claim 5
Dependent Claim
20 words
An electrical fuse assembly according to claim 1, wherein the first and second substrate are comprised of glass and ceramic.
Claim 6
Dependent Claim
23 words
An electrical fuse assembly according to claim 1, wherein the plurality of first and second conductive layers comprise a conductive thick film ink.
Claim 7
Dependent Claim
35 words
An electrical fuse assembly according to claim 1, wherein the plurality of first and second conductive layers comprise a metal selected from the group consisting essentially of silver, copper, zinc, nickel, gold, palladium, and platinum.
Claim 8
Dependent Claim
22 words
The electrical device of claim 1, wherein the device has an electrical resistance at approximately 25° C. of less than 1 ohm.
Claim 9
Dependent Claim
22 words
The electrical device of claim 1, wherein the device has an electrical resistance at approximately 25° C. of less than 0.5 ohm.
Claim 10
Dependent Claim
22 words
The electrical device of claim 1, wherein the device has an electrical resistance at approximately 25° C. of less than 0.1 ohm.
Claim 11
Dependent Claim
183 words
An electrical device comprising: a first and second laminar substrate, each laminar substrate having an inner surface and an outer surface; at least one conductive terminal pad deposited on the outer surface of the first laminar substrate; at least two conductive terminal pads deposited on the outer surface of the second laminar substrate; a fuse link electrically connecting the two conductive terminal pads deposited on the second laminar substrate, the entire fuse link being deposited on the outer surface of the second laminar substrate; first and second conductive layers deposited on the inner surfaces of the first and second laminar substrates, respectively; the first conductive layer electrically connected to at least one conductive terminal pad deposited on the outer surface of the first laminar substrate and the second conductive layer electrically connected to only one terminal pad deposited on the outer surface of the second laminar substrate; and a PTC element interposed between the first and second substrates and in electrical contact with the first and second conductive layers such that the PTC element is electrically connected in series with the fuse link.
Claim 12
Dependent Claim
183 words
An electrical device comprising: a first and second laminar substrate, each laminar substrate having an inner surface and an outer surface; at least one conductive terminal pad deposited on the outer surface of the first laminar substrate; at least two conductive terminal pads deposited on the outer surface of the second laminar substrate; a fuse link electrically connecting the two conductive terminal pads deposited on the second laminar substrate, the entire fuse link being deposited on the outer surface of the second laminar substrate; first and second conductive layers deposited on the inner surfaces of the first and second laminar substrates, respectively; the first conductive layer electrically connected to at least one conductive terminal pad deposited on the outer surface of the first laminar substrate and the second conductive layer electrically connected to only one terminal pad deposited on the outer surface of the second laminar substrate; and a PTC element interposed between the first and second substrates and in electrical contact with the first and second conductive layers such that the PTC element is electrically connected in series with the fuse link.
Claim 13
Dependent Claim
15 words
The electrical device of claim 10, wherein the first and second laminar substrates comprise ceramic.
Claim 14
Dependent Claim
31 words
The electrical device of claim 10, wherein the first and second laminar substrates are comprised of a material selected from the group consisting essentially of alumina, silica, beryllia and aluminum nitride.
Claim 15
Dependent Claim
17 words
The electrical device of claim 10, wherein the first and second laminar substrates comprise a glass-ceramic material.
Claim 16
Dependent Claim
19 words
The electrical device of claim 10, wherein the first and second conductive layers comprise a polymer thick film ink.
Claim 17
Dependent Claim
31 words
The electrical device of claim 10, wherein the first and second conductive layers comprise a metal selected from the group consisting essentially of silver, copper, zinc, nickel, gold, palladium and platinum.
Claim 18
Dependent Claim
45 words
An electrical device comprising: a PTC element composed of a polymer having electrically conductive particles dispersed therein; at least one metallized ceramic electrode; and, a fuse link electrically connected in series with the PTC element, the entire fuse link deposited on the metallized ceramic electrode.
Claim 19
Dependent Claim
45 words
An electrical device comprising: a PTC element composed of a polymer having electrically conductive particles dispersed therein; at least one metallized ceramic electrode; and, a fuse link electrically connected in series with the PTC element, the entire fuse link deposited on the metallized ceramic electrode.
Claim 20
Dependent Claim
33 words
An electrical device according to claim 16, wherein the metallized ceramic electrode has a pair of conductive terminal pads deposited on its surface, the conductive terminal pads electrically connected by the fuse link.
Claim 21
Dependent Claim
24 words
An electrical device according to claim 16, wherein the metallized ceramic electrode comprises a ceramic substrate having a conductive layer deposited on its surface.
Claim 22
Dependent Claim
24 words
An electrical device according to claim 16, wherein the metallized ceramic electrode comprises a ceramic substrate and a layer of conductive thick film ink.
Claim 23
Dependent Claim
27 words
An electrical device according to claim 16, wherein the metallized ceramic electrode comprises a material selected from the group consisting of alumina, silica, beryllia, and aluminum nitride.
Claim 24
Dependent Claim
16 words
An electrical device according to claim 16, wherein the metallized ceramic electrode comprises glass and ceramic.
Claim 25
Dependent Claim
36 words
An electrical device according to claim 16, wherein the metallized ceramic electrode comprises a ceramic substrate composed of Al 2 O 3 , a layer of conductive thick film ink, and a layer of conductive particles.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-09-01 | 2001-03-03 | 2001-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-09-01 | 2005-03-03 | 2005-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-09-01 | 2009-03-03 | 2009-09-02 | $7700.00 | Window Closed / Lapsed |