US6023028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface-mountable device having a voltage variable polgmeric material for protection against electrostatic damage to electronic components
Assignee: Littelfuse Inc
•
Filing: 1995-06-07
•
Granted: 2000-02-08
•
Expires: 2015-06-07
Abstract
Abstract The thin film, circuit device is an subminiature overvoltage protection device in a surface mountable configuration for use in printed circuit board or thick film hybrid circuit technology. The surface mountable device (SMD) is designed to protect against electrostatic discharge (ESD) damage to electronic components. The circuit protection device includes three material subassemblies. The first subassembly generally includes a substrate carier, electrodes, and terminal pads for connecting the protection device 60 to a PC board. The second subassembly includes a voltage variable polymer material with non-linear characteristics, and the third subassembly includes a cover coat for protecting other elements of the circuit protection device.
Inventors
- 👤 Andrew J. Neuhalfen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:20
CPC Classifications
H; H01; H01H; H01H85/00; H01H85/02; H01H85/04; H01H85/041; H01H85/046; H01C; H01C17/00; H01C17/06; H01C17/075; H01C17/08; H01C7/00; H01C7/006; H01C7/10; H01C7/1013; H01C7/12; H01H69/00; H01H69/02; H01H69/022; H01H85/0411; H01H2085/0414; H01H85/05; H01H85/055; H01H85/08; H01H85/11; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49101; Y10T29/49107; Y10T29/49117; Y10T29/49204
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
93 words
A surface-mounted circuit protection device comprising: a substrate having an upper surface; a pair of electrodes deposited on the upper surface of the substrate separated by a gap having a gap width, wherein the gap width, at least, partially determines a voltage rating for the circuit protection device, the electrodes having one or more notches therein for preventing narrowing of the gap width; and, a voltage variable polymeric material deposited between the electrodes in the gap of the upper surface of the substrate for protection against electrostatic transient voltage damage to electrical components.
Claim 2
Dependent Claim
93 words
A surface-mounted circuit protection device comprising: a substrate having an upper surface; a pair of electrodes deposited on the upper surface of the substrate separated by a gap having a gap width, wherein the gap width, at least, partially determines a voltage rating for the circuit protection device, the electrodes having one or more notches therein for preventing narrowing of the gap width; and, a voltage variable polymeric material deposited between the electrodes in the gap of the upper surface of the substrate for protection against electrostatic transient voltage damage to electrical components.
Claim 3
Dependent Claim
24 words
The surface-mount circuit protection device of claim 1, wherein the substrate has a periphery and the notches lie adjacent the periphery of the substrate.
Claim 4
Dependent Claim
21 words
The surface-mount circuit protection device of claim 1, wherein a pair of terminal pads are connected to the pair of electrodes.
Claim 5
Dependent Claim
30 words
The surface-mount circuit protection device of claim 1, wherein a first conductive layer is deposited on the substrate to form a pair of terminal pads and the pair of electrodes.
Claim 6
Dependent Claim
21 words
The surface-mount circuit protection device of claim 4, wherein the pair of terminal pads consist of a plurality of conductive layers.
Claim 7
Dependent Claim
31 words
The surface-mount circuit protection device of claim 5, wherein a protective layer having a flat top surface overlies the voltage variable polymeric material, the electrodes and the notches in the electrodes.
Claim 8
Dependent Claim
43 words
The surface-mount circuit protection device of claim 4, wherein the substrate has a lower surface and opposing side surfaces, the first conductive layer being deposited on the upper surface, extending over the side surfaces and terminating on the lower surface of the substrate.
References Cited (Backward Citations)
DE1803554A1
Cited
US3619725A
Cited
US3913219A
Cited
GB1477572A
Cited
US4278706A
Cited
US4198744A
Cited
US4547830A
Cited
WO1983001153A1
Cited
US4554732A
Cited
US4503415A
Cited
US4540969A
Cited
US4626818A
Cited
US4533896A
Cited
US4514718A
Cited
US4612529A
Cited
US4837520A
Cited
US4792781A
Cited
US4652848A
Cited
US4726991A
Cited
EP0270954A1
Cited
US5155462A
Cited
US4720402A
Cited
US4771260A
Cited
EP0301533A2
Cited
DE3728489A1
Cited
US4958426A
Cited
US5438166A
Cited
US4977357A
Cited
US4873506A
Cited
WO1990000305A1
Cited
JPH0243701A
Cited
US5058250A
Cited
US4975551A
Cited
US5102712A
Cited
US5097246A
Cited
EP0453217A1
Cited
US5140295A
Cited
JPH0433230A
Cited
US5232758A
Cited
US5084691A
Cited
US5148141A
Cited
US5115220A
Cited
JPH04242036A
Cited
JPH04248221A
Cited
JPH04245129A
Cited
JPH04245132A
Cited
JPH04255627A
Cited
US5102506A
Cited
US5095297A
Cited
US5097247A
Cited
JPH05166454A
Cited
US5166656A
Cited
JPH05314888A
Cited
EP0581428A1
Cited
JPH06103880A
Cited
US5262754A
Cited
US5340775A
Cited
US5374590A
Cited
US5363082A
Cited
US5537108A
Cited
US5552757A
Cited
US5592016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-02-07 | 2003-08-09 | 2004-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-02-07 | 2007-08-09 | 2008-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-02-07 | 2011-08-09 | 2012-02-08 | $7700.00 | Window Closed / Lapsed |