US3797475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable cordless hairdryer
Assignee: Ronson Corp
•
Filing: 1972-09-12
•
Granted: 1974-03-19
•
Expires: 1992-09-12
Abstract
Abstract A portable cordless hairdryer comprising a heater unit to produce an exothermic reaction at a controlled rate and battery operated blower means to direct air heated by the heater unit onto hair to be dried.
Inventors
- 👤 T Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:29
CPC Classifications
A; A45; A45D; A45D20/00; A45D20/04; A45D20/06; A45D2020/065
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
232 words
A portable cordless hairdryer comprising a casing having an air outlet aperture therein, blower means within said casing to force a flow of air through said casing and out said air outlet aperture, a portable power source within said casing adapted to be selectively connected to said blower means to activate said blower means, an exothermic heater unit disposed within said casing and comprising a closed housing located between said air outlet aperture and said blower means in the path of flow of the air forced to flow through said casing, said housing forming a closed space therewithin and said housing having perforations formed therethrough affording communication between the space within said housing and the exterior of said housing, a core of solid fuel material combustible in air and capable of sustained combustion located within the closed space in said housing, a wire element enclosed within the space in said closed housing and disposed in contact with said core of solid combustible fuel material, an electrical circuit arranged for selectively connecting said portable power source to said wire element so that when said wire element is connected to said power source said wire element incandesces and ignites said core of solid combustible fuel material and the heat generated by said core is removed by air blown through the perforations in said housing and passing over the ignited core of solid combustible material.
Claim 2
Dependent Claim
232 words
A portable cordless hairdryer comprising a casing having an air outlet aperture therein, blower means within said casing to force a flow of air through said casing and out said air outlet aperture, a portable power source within said casing adapted to be selectively connected to said blower means to activate said blower means, an exothermic heater unit disposed within said casing and comprising a closed housing located between said air outlet aperture and said blower means in the path of flow of the air forced to flow through said casing, said housing forming a closed space therewithin and said housing having perforations formed therethrough affording communication between the space within said housing and the exterior of said housing, a core of solid fuel material combustible in air and capable of sustained combustion located within the closed space in said housing, a wire element enclosed within the space in said closed housing and disposed in contact with said core of solid combustible fuel material, an electrical circuit arranged for selectively connecting said portable power source to said wire element so that when said wire element is connected to said power source said wire element incandesces and ignites said core of solid combustible fuel material and the heat generated by said core is removed by air blown through the perforations in said housing and passing over the ignited core of solid combustible material.
Claim 3
Dependent Claim
59 words
A hairdryer, as set forth in claim 1, wherein said core of solid combustible fuel material is a charcoal rod completely enclosed within the space in said housing, said wire element is wound about the exterior of said rod, and each end of said wire element is selectively operably connected To said portable power source by said electrical circuit.
Claim 4
Dependent Claim
66 words
A hairdryer, as set forth in claim 2, wherein said portable power source comprises at least one battery and said electrical circuit extends from said battery to said wire element and to said blower means, and said electrical circuit including switch means operable from the exterior of said casing for selectively connecting said battery to said wire element and said blower means through said electrical circuit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |