US4769901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making PTC devices
Assignee: Nippon Mektron KK
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Filing: 1987-02-26
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Granted: 1988-09-13
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Expires: 2007-02-26
Abstract
Abstract A process for producing a PTC device comprising the steps of forming a laminate comprising a PTC composition and at least two electrode plates having the PTC composition sandwiched therebetween, superposing, on the surface of each of the electrode plates of the laminate, a lead plate to be electrically connected to the electrode, joining the electrode plate and the lead plate by spot welding, and during or prior to the spot welding process, forming at least one through hole penetrating through the electrode plate and the lead plate in the center of a weld. This process can minimize the heat damage of the PTC composition and the resulting PTC device has a low contact resistance.
Inventors
- 👤 Atsushi Nagahori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:08
CPC Classifications
H; H01; H01C; H01C1/00; H01C1/14; H01C1/1406; H01C1/144; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49085; Y10T29/49101; Y10T29/49117; Y10T29/49124; Y10T29/49147; Y10T29/49149
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
A process for producing a PTC device which comprises the steps of forming a laminate comprising a PTC composition and at least two electrode plates having the PTC composition sandwiched therebetween; superposing, on the surface of each of the electrode plates of the laminate, a lead plate to be electrically connected to the electrode; and joining the electrode plate and the lead plate by spot welding, and prior to or during the spot welding process, forming at least one through hole penetrating through the electrode plate and the lead plate at a weld.
Claim 2
Dependent Claim
93 words
A process for producing a PTC device which comprises the steps of forming a laminate comprising a PTC composition and at least two electrode plates having the PTC composition sandwiched therebetween; superposing, on the surface of each of the electrode plates of the laminate, a lead plate to be electrically connected to the electrode; and joining the electrode plate and the lead plate by spot welding, and prior to or during the spot welding process, forming at least one through hole penetrating through the electrode plate and the lead plate at a weld.
Claim 3
Dependent Claim
30 words
The process according to claim 1 wherein a positive and a negative electrode for spot welding are brought into contact with surface of said lead plate in the same direction.
Claim 4
Dependent Claim
26 words
The process according to claim 2 wherein the contact area of the positive and negative electrodes for spot welding is from 0.0025 to 4.0 square millimeter.
Claim 5
Dependent Claim
24 words
The process according to claim 2 wherein the spacing of the positive and negative electrodes for spot welding is from 0.01 to 1.0 millimeter.
References Cited (Backward Citations)
US3748439A
Cited
US4480166A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |