US4959632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic PTC thermistor
Assignee: Murata Manufacturing Co Ltd
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Filing: 1989-04-06
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Granted: 1990-09-25
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Expires: 2009-04-06
Abstract
Abstract An organic positive temperature coefficient (PTC) thermistor includes an organic PTC thermistor sheet on which a roughened surface is formed by pressing a wire mesh against one main surface thereof at a predetermined pressure. This results in the main surface of the organic PTC thermistor sheet being roughtened. A pair of electrodes are then formed on the main surface of the organic PTC thermistor sheet.
Inventors
- 👤 Katsuyuki Uchida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:07
CPC Classifications
H; H01; H01C; H01C1/00; H01C1/14; H01C1/1406; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49085
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
46 words
An organic PTC thermistor, comprising: an organic PTC thermistor sheet, a surface of said organic PTC thermistor sheet being roughened by a mechanical method; and a pair of electrodes formed on a thus roughened surface of said organic PTC thermistor sheet by means of conductive paste.
Claim 2
Dependent Claim
46 words
An organic PTC thermistor, comprising: an organic PTC thermistor sheet, a surface of said organic PTC thermistor sheet being roughened by a mechanical method; and a pair of electrodes formed on a thus roughened surface of said organic PTC thermistor sheet by means of conductive paste.
Claim 3
Dependent Claim
31 words
An organic PTC thermistor in accordance with claim 1, wherein a number of recess portions are formed on the surface of said organic PTC thermistor sheet by pressing an uneven member.
Claim 4
Dependent Claim
17 words
An organic PTC thermistor in accordance with claim 2, wherein said uneven member includes a wire mesh.
Claim 5
Dependent Claim
24 words
An organic PTC thermistor in accordance with claim 2, wherein said uneven member includes a roller on a surface of which unevenness is formed.
Claim 6
Independent Claim
33 words
A method for roughening a surface of an organic PTC thermistor sheet, comprising a step of pressing an uneven member against the surface of said organic PTC thermistor sheet at a predetermined pressure.
Claim 7
Independent Claim
33 words
A method for roughening a surface of an organic PTC thermistor sheet, comprising a step of pressing an uneven member against the surface of said organic PTC thermistor sheet at a predetermined pressure.
Claim 8
Independent Claim
52 words
A method for manufacturing an organic PTC thermistor, comprising steps of: preparing an organic PTC thermistor sheet; roughening a surface of said organic PTC thermistor sheet by a mechanical method; and forming a pair of electrodes on a roughened surface of said organic PTC thermistor sheet by painting or printing conductive paste.
Claim 9
Independent Claim
52 words
A method for manufacturing an organic PTC thermistor, comprising steps of: preparing an organic PTC thermistor sheet; roughening a surface of said organic PTC thermistor sheet by a mechanical method; and forming a pair of electrodes on a roughened surface of said organic PTC thermistor sheet by painting or printing conductive paste.
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) | 1993-09-24 | 1994-03-26 | 1994-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-24 | 1998-03-26 | 1998-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-24 | 2002-03-26 | 2002-09-25 | $7700.00 | Window Closed / Lapsed |