US4570046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of processing PTC heater
Assignee: Control Devices LLC
•
Filing: 1983-09-09
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Granted: 1986-02-11
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Expires: 2003-09-09
Abstract
Abstract A PTC heater has passages therethrough through which a fluid can flow to be heated. The passages are separated from each other by thin walls of PTC material. Electrical current flow is in a direction normal to the thin walls. A short duration pulse of high electric current is applied to the heater in order to eliminate any electrical shorts between passages.
Inventors
- 👤 Lionel J. Melanson
- 👤 Frank Bucherati
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:17
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/02; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/141; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49718; Y10T29/49748; Y10T29/4975
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
66 words
In the manufacture of a PTC heater having passages therethrough, the passages being separated from each other by thin walls of PTC material, where electrical current flow during normal operation of the heater is in a direction normal to the thin walls, the process of subjecting the heater to a short duration pulse of high electric current in order to eliminate any electrical shorts between passages.
Claim 2
Dependent Claim
66 words
In the manufacture of a PTC heater having passages therethrough, the passages being separated from each other by thin walls of PTC material, where electrical current flow during normal operation of the heater is in a direction normal to the thin walls, the process of subjecting the heater to a short duration pulse of high electric current in order to eliminate any electrical shorts between passages.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the pulse is delivered from an electrically charged capacitor.
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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) | 1989-02-10 | 1989-08-12 | 1990-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-10 | 1993-08-12 | 1994-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-10 | 1997-08-12 | 1998-02-11 | $7700.00 | Window Closed / Lapsed |