Title: Method of stabilizing the hot resistance of ceramic positive temperature coefficient resistors

Abstract: The hot resistance of ceramic positive temperature coefficient resistors is stabilized by subjecting such resistors to a heat treatment over a period of time ranging from 1 to 40 hours at a temperature in the range of 400.degree. to 500.degree. C., either during or after the application of contact coatings on the resistor.

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Inventors: Seebacher, Baerbel (Munich, DT)

Application Number: 478855
Filing Date: 1974-06-13
Publication_date: 1976-01-20
Assignee: Siemens Aktiengesellschaft (Berlin & Munich, DT)
Primary Class(es): 427/103 29/610.1, 29/611, 29/612, 29/621, 252/520.21, 338/22R, 338/22SD, 427/125, 427/383.5, 438/2, 438/104
Other Classes:
US Patent Ref:

3037180	May, 1962	Lin, Jr.	29/621.
3258434	Jun, 1966	Mackenzie et al.	338/22.
3449824	Jun, 1969	Heilmeier	29/610.
3754987	Aug, 1973	Purdes	29/610.

Other Refs: 1,490,713

Dec, 1972	DT.

Primary Examiner: Weinblatt, Mayer
Assistant Examiner:
Attorney: Hill, Gross, Simpson, Van Santen, Steadman, Chiara & Simpson