The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 16, 1982
Filed:
Dec. 31, 1975
Richard H Carlson, Cumberland, RI (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A hair dryer for use in personal beauty care incorporates a blower for moving a stream of air through a dryer housing onto the hair. A self-regulating, disc-shaped, electrical resistance heater body formed of a ceramic material of positive temperature coefficient of resistivity (PTC) and having a multiplicity of air flow passages extending between the opposite faces thereof is arranged the housing for heating the air stream. The heater body is mounted for rotational movement between a first position wherein the passages are parallel to the air flow direction so that substantially all of the air stream is directed through the passages and a second position wherein the passages are oblique to the air flow direction so that a substantial part of the air stream passes around the heater body without passing through the passages, whereby the temperature of the heated air directed onto the hair can be selectively varied by rotating the heater body to adjust the proportion of the air stream which is allowed to flow through the heater body passages. The heater body may be provided with baffles to maintain the air flow constant while the air temperature is varied by rotation of the heater body.