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US3673382A Expired / Lapsed US ⏱️ 0.0 years remaining

Electrically heated hair curler

Assignee: Philips North America LLC
•
Filing: 1969-12-09
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Granted: 1972-06-27
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Expires: 1989-12-09
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Abstract

Abstract A cylindrically shaped plastic hair curler having an electrical resistor positioned therein for heat generation. Heat transfer elements positioned within the hair curler for conducting the heat from the resistors to the cylindrical walls include a heatsink surrounding the resistor and in contact with and conforming to the inner surface of the plastic hair curler. The heat-sink is formed of two shell members having aligned, inwardly projecting cavities for housing the electrical resistor. The resistors may also be supported on a spool member which will support the heat transfer members which surround and are in contact with the resistors. A shell heat-sink member may then surround the heat transfer members to carry the heat of the resistors to the outer wall of the curler.

Inventors

  • 👤 Francis J Gaffney
  • 👤 Joseph F Degen
  • 👤 Gerald F Clark

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 20:51
CPC Classifications
A; A45; A45D; A45D2/00; A45D2/36; A45D2/367

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 288 words
An electrically heated hair curler which will uniformly and quickly heat to proper hair curling temperature comprising a hollow-walled cylindrically shaped curler member, means enclosing both ends of said curler member, at least one electrical resistor housed within said curler member for generating heat, a pair of shell members positioned within the curler member for uniformly transferring the heat generated by said electrical resistor to the outer wall of said curler member, each shell member being constructed of heat conducting material and comprising a cylindrically shaped outer wall conforming to the shape of the curler wall arranged in intimate contact with the curler wall, an inwardly extending cavity defined by inwardly projecting edges of said shell for accommodating therein at least a portion of said electrical resistor, said pair of shell members arranged in endto-end relation within said curler member so that said cavities are aligned and abut each other so as to form a single cavity for housing therein the entire electrical resistor, said resistor being in thermal contact with the inwardly projecting edges defining the cavity of said shell members so that the heat generated by said resistor is transferred to the outer wall of said shells, a sleeve member extending from opposite ends of said resistor longitudinally through each of said shells for carrying therethrough lead wires of said resistor, said lead wires being in electrical contact with said sleeve Members, electrical terminals connected to the ends of said sleeve members and extending externally of both opposite ends of the curler member for connection to a source of electric current, and a plurality of finger-like projections extending outwardly about the periphery of the cylindrical shaped curler member for engaging strands of hair to be curled.
Claim 2
Dependent Claim 288 words
An electrically heated hair curler which will uniformly and quickly heat to proper hair curling temperature comprising a hollow-walled cylindrically shaped curler member, means enclosing both ends of said curler member, at least one electrical resistor housed within said curler member for generating heat, a pair of shell members positioned within the curler member for uniformly transferring the heat generated by said electrical resistor to the outer wall of said curler member, each shell member being constructed of heat conducting material and comprising a cylindrically shaped outer wall conforming to the shape of the curler wall arranged in intimate contact with the curler wall, an inwardly extending cavity defined by inwardly projecting edges of said shell for accommodating therein at least a portion of said electrical resistor, said pair of shell members arranged in endto-end relation within said curler member so that said cavities are aligned and abut each other so as to form a single cavity for housing therein the entire electrical resistor, said resistor being in thermal contact with the inwardly projecting edges defining the cavity of said shell members so that the heat generated by said resistor is transferred to the outer wall of said shells, a sleeve member extending from opposite ends of said resistor longitudinally through each of said shells for carrying therethrough lead wires of said resistor, said lead wires being in electrical contact with said sleeve Members, electrical terminals connected to the ends of said sleeve members and extending externally of both opposite ends of the curler member for connection to a source of electric current, and a plurality of finger-like projections extending outwardly about the periphery of the cylindrical shaped curler member for engaging strands of hair to be curled.
Claim 3
Dependent Claim 56 words
A hair curler as claimed in claim 1 further including a rim member formed on the surface of the cylindrical curler member and projecting outwardly around the periphery of the curler a distance at least equal to the extension of the finger-like projections, said rim preventing the interlocking of the finger-like projections of adjacently placed curlers.
Claim 4
Dependent Claim 34 words
A hair curler as claimed in claim 2 wherein the sleeve assembly has a shoulder portion for abutting engagement with the end of the curler and to rigidly position the resistor within the curler.
Claim 5
Dependent Claim 25 words
A hair curler as claimed in claim 3 wherein the hair curler is made of flame-retardant polypropylene and the shell is made of extruded aluminum.

References Cited (Backward Citations)

US3515851A Cited
US3487197A Cited
US3519792A Cited
US3560704A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-06-27 1975-12-27 1976-06-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-06-27 1979-12-27 1980-06-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-06-27 1983-12-27 1984-06-27 $7700.00 Window Closed / Lapsed

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