Electric heating device with tolerance PTC heating element

Details Electric heating device with tolerance PTC heating element Electric heating device with tolerance PTC heating element

2006-11-10

2010-02-23

Paschall, Mark H (Department: 3742)

Electric heating

Heating devices

With power supply and voltage or current regulation or...

C219S483000, C219S494000

Reexamination Certificate

active

07667164

ABSTRACT:
For avoiding the selection and storage of PTC heating elements with different departures from rated heating power, additional tolerance PTC heating elements are held ready which uniformly have a lower rated heating power, preferably one half or third of the rated heating power, compared to the standard or primary PTC heating element. By the use of a second standardized heating element, i. e. the tolerance PTC heating element, the storage of a high number of PTC heating elements with different departures can be dispensed with and a cheaper manufacture can be permitted.

REFERENCES:
patent: 5471034 (1995-11-01), Kawate et al.
patent: 5471035 (1995-11-01), Holmes
patent: 7271369 (2007-09-01), Li et al.
patent: 7343671 (2008-03-01), Hetherton et al.

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