CHARLES D FLANAGAN
Engineering in South Attleboro, MA
License number
Massachusetts 14690
Expiration Date
Jun 30, 1984
Type
Mechanical Engineer
Address
Address
South Attleboro, MA 02703
Personal information
See more information about CHARLES D FLANAGAN at radaris.comName
Address
Phone
53 Park Ave, Arlington, MA 02476
35 New St, Worcester, MA 01605
98 Patterson St, Attleboro, MA 02703
88 Bancroft St, Gardner, MA 01440
755 Main St, Clinton, MA 01510
Professional information
See more information about CHARLES D FLANAGAN at trustoria.com
Self-Limiting Electric Hair Curler Heater
Self-Limiting Electric Hair Curler Heater
US Patent:
3973100, Aug 3, 1976
Filed:
Dec 27, 1972
Appl. No.:
5/318951
Inventors:
Charles D. Flanagan - Attleboro MA
Assignee:
Texas Instruments Incorporated - Dallas TX
International Classification:
H05B 100, A45D 236, A45D 416
US Classification:
219222
Abstract:
A heated hair curler has a fast warm-up time and a slow cool down time due to a heater element having a steeply sloped positive temperature coefficient (PTC) of resistivity. The heater is composed of a ceramic like material such as doped barium titanate or a polymer loaded with conductive particles such as polyethylene loaded with carbon black. In one embodiment the heater is shaped in the form of an elongated annulus to fit closely inside a hollow plastic curler shell. Conductive coatings located on the inner and outer peripheral surfaces mate with ring shaped conductors supported in a base. In a second embodiment the PTC heating element which may be in the form of a parallelopiped is located within a sealed cylindrical container, also containing a fusible wax, which in turn fits within the hollow plastic curler shell. The PTC element has conductive coatings on two opposite faces for electrical connection thereto.