Patent US6628498B2 successfully refreshed from Google Patents.
US6628498B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated electrostatic discharge and overcurrent device
Assignee: Littelfuse Inc
•
Filing: 2001-07-31
•
Granted: 2003-09-30
•
Expires: 2021-07-31
Abstract
Abstract An electrical circuit protection device has an overcurrent protection portion and an overvoltage protection portion. The overcurrent protection portion has a surface. The overvoltage protection portion is disposed on the surface. In one preferred embodiment, the overcurrent portion includes a PTC device and the overvoltage portion includes a voltage variable material. A number of terminations are configured to connect the overcurrent protection portion and the overvoltage protection portion to a printed circuit board.
Inventors
- 👤 Steven J. Whitney
- 👤 Nate Maercklein
- 👤 Rob Deblieck
- 👤 Scott Davidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:58
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/02; H01C7/021; H10; H10W; H10W42/00; H10W42/60; H02; H02H; H02H9/00; H02H9/04; H02H9/042; H10W72/00; H10W72/071; H10W72/075; H10W72/07551; H10W72/07552; H10W72/50; H10W72/521; H10W72/527; H10W72/851; H10W72/874; H10W72/884; H10W90/00; H10W90/701; H10W90/731; H10W90/734; H10W90/751; H10W90/754
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
78 words
An electrical circuit protection device, comprising: an overcurrent protection portion having a first substrate, a second substrate and a PTC element disposed between the first and second substrates, each of the first and second substrates having an outer surface; a voltage variable material disposed on at least one of the outer surfaces of the substrates; an overcurrent termination that electrically communicates with the overcurrent protection portion; and an overvoltage termination that electrically communicates with the voltage variable material.
Claim 2
Dependent Claim
78 words
An electrical circuit protection device, comprising: an overcurrent protection portion having a first substrate, a second substrate and a PTC element disposed between the first and second substrates, each of the first and second substrates having an outer surface; a voltage variable material disposed on at least one of the outer surfaces of the substrates; an overcurrent termination that electrically communicates with the overcurrent protection portion; and an overvoltage termination that electrically communicates with the voltage variable material.
Claim 3
Dependent Claim
36 words
The device of claim 1 , wherein the overcurrent protection portion includes each substrate having an electrode disposed thereon, and the PTC element positioned between the first and second substrates and electrically connected to the electrodes.
Claim 4
Dependent Claim
25 words
The device of claim 2 , wherein the substrates each include an outer surface, and the voltage variable material is disposed on the outer surfaces.
Claim 5
Dependent Claim
22 words
The device of claim 1 , wherein the overcurrent termination electrically communicates with the overcurrent protection portion and the voltage variable material.
Claim 6
Dependent Claim
13 words
The device of claim 1 , which includes a plurality of overvoltage terminations.
Claim 7
Dependent Claim
24 words
The device of claim 1 , wherein the surface defines a gap, the gap is at least partially covered by the voltage variable material.
Claim 8
Dependent Claim
43 words
The device of claim 1 , further comprising a common termination and a spark gap, the spark gap located on the surface between the overcurrent termination and the common termination, the spark gap is at least partially covered by the voltage variable material.
Claim 9
Dependent Claim
43 words
The device of claim 1 , further comprising a common termination and a spark gap, the spark gap located on the surface between the overvoltage termination and the common termination, the spark gap is at least partially covered by the voltage variable material.
Claim 10
Dependent Claim
31 words
The device of claim 1 , which includes a plurality of overvoltage terminations that are configured to electrically communicate with a plurality of data lines disposed on a printed circuit board.
Claim 11
Dependent Claim
77 words
An electrical circuit protection device, comprising: an overcurrent protection portion having a surface; a voltage variable material disposed on the surface; an overcurrent termination that electrically communicates with the overcurrent protection portion; and an overvoltage termination that electrically communicates with the voltage variable material; wherein the overvoltage and overcurrent terminations are configured to electrically communicate on a printed circuit board with a Universal Serial Buss port or an Institute of Electrical and Electronics Engineers (“IEEE”) 1394 port.
Claim 12
Dependent Claim
77 words
An electrical circuit protection device, comprising: an overcurrent protection portion having a surface; a voltage variable material disposed on the surface; an overcurrent termination that electrically communicates with the overcurrent protection portion; and an overvoltage termination that electrically communicates with the voltage variable material; wherein the overvoltage and overcurrent terminations are configured to electrically communicate on a printed circuit board with a Universal Serial Buss port or an Institute of Electrical and Electronics Engineers (“IEEE”) 1394 port.
Claim 13
Dependent Claim
54 words
An electrical circuit protection device, comprising: an overcurrent protection portion having a surface; a voltage variable material disposed on the surface; an overcurrent termination that electrically communicates with the overcurrent protection portion; and an overvoltage termination that electrically communicates with the voltage variable material; wherein the device is provided in an 1812 package size.
Claim 14
Dependent Claim
54 words
An electrical circuit protection device, comprising: an overcurrent protection portion having a surface; a voltage variable material disposed on the surface; an overcurrent termination that electrically communicates with the overcurrent protection portion; and an overvoltage termination that electrically communicates with the voltage variable material; wherein the device is provided in an 1812 package size.
Claim 15
Dependent Claim
54 words
An electrical circuit protection device, comprising: an overcurrent protection portion having a surface; a voltage variable material disposed on the surface; an overcurrent termination that electrically communicates with the overcurrent protection portion; and an overvoltage termination that electrically communicates with the voltage variable material; wherein the device is provided in a 2029 package size.
Claim 16
Dependent Claim
54 words
An electrical circuit protection device, comprising: an overcurrent protection portion having a surface; a voltage variable material disposed on the surface; an overcurrent termination that electrically communicates with the overcurrent protection portion; and an overvoltage termination that electrically communicates with the voltage variable material; wherein the device is provided in a 2029 package size.
Claim 17
Dependent Claim
54 words
An electrical circuit protection device, comprising: an overcurrent protection portion having a surface; a voltage variable material disposed on the surface; an overcurrent termination that electrically communicates with the overcurrent protection portion; and an overvoltage termination that electrically communicates with the voltage variable material; wherein the device is provided in a 3425 package size.
Claim 18
Dependent Claim
54 words
An electrical circuit protection device, comprising: an overcurrent protection portion having a surface; a voltage variable material disposed on the surface; an overcurrent termination that electrically communicates with the overcurrent protection portion; and an overvoltage termination that electrically communicates with the voltage variable material; wherein the device is provided in a 3425 package size.
Claim 19
Dependent Claim
57 words
An electrical circuit protection device, comprising: an overcurrent protection portion having a surface; a voltage variable material disposed on the surface; an overcurrent termination that electrically communicates with the overcurrent protection portion; and an overvoltage termination that electrically communicates with the voltage variable material; wherein the voltage variable material includes a matrix of conductive and semiconductive particles.
Claim 20
Dependent Claim
57 words
An electrical circuit protection device, comprising: an overcurrent protection portion having a surface; a voltage variable material disposed on the surface; an overcurrent termination that electrically communicates with the overcurrent protection portion; and an overvoltage termination that electrically communicates with the voltage variable material; wherein the voltage variable material includes a matrix of conductive and semiconductive particles.
Claim 21
Dependent Claim
27 words
The device of claim 1 , wherein the voltage variable material includes irregularly shaped conductor particles having insulative oxide surface coatings that are bound in a matrix.
Claim 22
Dependent Claim
39 words
The device of claim 1 , wherein the voltage variable material includes a mixture of conductive and semiconductive particles having surfaces coated with an insulative oxide film, the conductive and semiconductive particles being bound together in an insulative binder.
Claim 23
Dependent Claim
35 words
The device of claim 1 , wherein the voltage variable material includes conductive and semiconductive particles that are coated with an insulative oxide film and that are bound together in point contact with one another.
Claim 24
Dependent Claim
79 words
An electrical circuit protection device, comprising: an overcurrent protection portion having a surface; a voltage variable material disposed on the surface; an overcurrent termination that electrically communicates with the overcurrent protection portion; an overvoltage termination that electrically communicates with the voltage variable material; a common termination; and a spark gap on the surface between the common termination and one of the overvoltage termination and the overcurrent termination, wherein the voltage variable material at least partially covers the spark gap.
Claim 25
Dependent Claim
79 words
An electrical circuit protection device, comprising: an overcurrent protection portion having a surface; a voltage variable material disposed on the surface; an overcurrent termination that electrically communicates with the overcurrent protection portion; an overvoltage termination that electrically communicates with the voltage variable material; a common termination; and a spark gap on the surface between the common termination and one of the overvoltage termination and the overcurrent termination, wherein the voltage variable material at least partially covers the spark gap.
Claim 26
Dependent Claim
32 words
The device of claim 18 , wherein the surface is a first surface and the overcurrent protection portion further includes a second surface, and voltage variable material disposed on the second surface.
Claim 27
Dependent Claim
37 words
The device of claim 19 , wherein the second surface has a plurality of terminations and a spark gap between two of the terminations, the spark gap being at least partially covered by the voltage variable material.
Claim 28
Dependent Claim
68 words
An electrical circuit protection device, comprising: a first substrate having top and bottom surfaces and an electrode disposed on the top surface; a second substrate having top and bottom surfaces and an electrode disposed on the bottom surface; a PTC element positioned between the first and second substrates and electrically connected to the electrodes; and a voltage variable material disposed on the top surface of the second substrate.
Claim 29
Dependent Claim
68 words
An electrical circuit protection device, comprising: a first substrate having top and bottom surfaces and an electrode disposed on the top surface; a second substrate having top and bottom surfaces and an electrode disposed on the bottom surface; a PTC element positioned between the first and second substrates and electrically connected to the electrodes; and a voltage variable material disposed on the top surface of the second substrate.
Claim 30
Dependent Claim
20 words
The device of claim 21 , which includes voltage variable material disposed on the bottom surface of the first substrate.
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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) | 2006-09-29 | 2007-03-31 | 2007-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-09-29 | 2011-03-31 | 2011-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-09-29 | 2015-03-31 | 2015-09-30 | $7700.00 | Window Closed / Lapsed |