Patent US4482801A successfully refreshed from Google Patents.
US4482801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positive-temperature-coefficient thermistor heating device
Assignee: Panasonic Holdings Corp
•
Filing: 1982-12-14
•
Granted: 1984-11-13
•
Expires: 2002-12-14
Abstract
Abstract A positive-temperature-coefficient (PTC) thermistor heating element in which joints between metal heat radiating means and the electrodes on a positive-temperature-coefficient thermistor element are attained only with an electrically insulative adhesive in such a way that prior to and during the curing step, the heat radiating means are pressed against the electrodes to establish thereby electrical contacts at least partially between them. The heat radiating means also function as current paths to and out, respectively, of the thermistor element. The PTC thermistor heating device is simple in construction and easy to fabricate at less cost yet has a high and stable thermal output.
Inventors
- 👤 Etsuroh Habata
- 👤 Nobumasa Ohshima
- 👤 Kenji Kanatani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:54
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/40; H05B3/42; H05B3/48; H05B3/50; H05B3/10; H05B3/12; H05B3/14; H05B2203/00; H05B2203/02; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1056; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49083
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
101 words
A positive-temperature-coefficient (PTC) thermistor heating device, comprising: a PTC thermistor element having opposite major surfaces with corresponding metallic electrodes disposed thereon and adherent thereto; metal heat radiating means having a heat transfer surface contiguous with an exposed surface of at least one of said electrodes, said exposed surfaces of the electrodes having a multiplicity of minute surface irregularities comprising high points and low points, said high points providing direct electrical and mechanical connection between said contiguous surfaces; and an electrically non-conductive, thermally conductive adhesive bonding said contiguous surfaces together and filling the spaces between said contiguous surfaces due to said irregularities.
Claim 2
Dependent Claim
101 words
A positive-temperature-coefficient (PTC) thermistor heating device, comprising: a PTC thermistor element having opposite major surfaces with corresponding metallic electrodes disposed thereon and adherent thereto; metal heat radiating means having a heat transfer surface contiguous with an exposed surface of at least one of said electrodes, said exposed surfaces of the electrodes having a multiplicity of minute surface irregularities comprising high points and low points, said high points providing direct electrical and mechanical connection between said contiguous surfaces; and an electrically non-conductive, thermally conductive adhesive bonding said contiguous surfaces together and filling the spaces between said contiguous surfaces due to said irregularities.
Claim 3
Dependent Claim
30 words
The heating device according to claim 1, wherein said adhesive is capable of being cured at a temperature at least approximately equal to the Curie point of said thermistor element.
References Cited (Backward Citations)
US3261396A
Cited
US3397278A
Cited
US3996447A
Cited
US4151547A
Cited
US4352008A
Cited
US4341949A
Cited
US4371777A
Cited
US4414052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-13 | 1988-05-14 | 1988-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-13 | 1992-05-14 | 1992-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-13 | 1996-05-14 | 1996-11-13 | $7700.00 | Window Closed / Lapsed |