US3818600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hair dryer with hood
Assignee: Gillette Co LLC
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Filing: 1973-04-23
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Granted: 1974-06-25
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Expires: 1993-04-23
Abstract
Abstract Portable hair dryer of the type having a hood with a blower and heater mounted on it, the blower having a centrifugal fan with radially extending blades having convexly curved leading faces, each blade being secured along its trailing edge to an imperforate disc, the fan being mounted at the exit end of a duct with the tips of the leading edges of the blades within the duct and the remainder of the blades outside the duct.
Inventors
- 👤 E Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:19
CPC Classifications
A; A45; A45D; A45D20/00; A45D20/18; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49329
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
184 words
In a portable hair dryer having a double-walled hood for enveloping a head of hair, the inner wall being perforated, and combination centrifugal blower and heater means mounted on said hood for introducing a supply of heated air into the space between the walls of said hood for discharge onto the hair through said perforations, the improvement which comprises in said blower a duct for the supply of air having an entrance end and an exit end of circular cross section, a centrifugal fan in the form of a circular array of circumferentially spaced, radially extending blades each increasing in width from the root toward the tip with the leading face of each blade being pitched at an acute angle from the axis of rotation and the trailing edge of each blade joining along its length an imperforate disc rotatable with said array of blades, said fan being centrally mounted at the exit end of said duct with the leading edge of the tip of each blade disposed within said duct and the remainder of each blade beyond the exit end of the duct.
Claim 2
Dependent Claim
184 words
In a portable hair dryer having a double-walled hood for enveloping a head of hair, the inner wall being perforated, and combination centrifugal blower and heater means mounted on said hood for introducing a supply of heated air into the space between the walls of said hood for discharge onto the hair through said perforations, the improvement which comprises in said blower a duct for the supply of air having an entrance end and an exit end of circular cross section, a centrifugal fan in the form of a circular array of circumferentially spaced, radially extending blades each increasing in width from the root toward the tip with the leading face of each blade being pitched at an acute angle from the axis of rotation and the trailing edge of each blade joining along its length an imperforate disc rotatable with said array of blades, said fan being centrally mounted at the exit end of said duct with the leading edge of the tip of each blade disposed within said duct and the remainder of each blade beyond the exit end of the duct.
Claim 3
Dependent Claim
19 words
A hair dryer as claimed in claim 1 in which said fan blades have their leading faces convexly curved.
Claim 4
Dependent Claim
29 words
A hair dryer as claimed in claim 1 in which the trailing edge of each blade lies in a plane perpendicular to the axis of rotation of the fan.
Claim 5
Dependent Claim
21 words
A hair dryer as claimed in claim 3 in which all said blades are formed of a single sheet metal member.
Claim 6
Dependent Claim
88 words
A hair dryer as claimed in claim 3 in which the angle of pitch of each blade is less than 70*, the overall maximum diameter of said array of blades is approximately equal to the diameter of said duct, the spacing between the trailing edge of each blade and the exit end of said duct is equal to at least 10% of the duct diameter, and the radial spacing between the duct and the tip edge of each blade is from 2 to 5% of the duct diameter.
Claim 7
Dependent Claim
132 words
A blower for use in a portable hair dryer comprising a duct for the supply of air having an entrance end and an exit end of circular cross section, a centrifugal fan in the form of a circular array of circumferentially spaced, radially extending blades each increasing in width from the root toward the tip with the leading face of each blade being pitched at an acute angle from the axis of rotation and the trailing edge of each blade joining along its length an imperforate disc rotatable with said array of blades, said fan being centrally mounted at the exit end of said duct with the leading edge of the tip of each blade disposed within said duct and the remainder of each blade beyond the exit end of the duct.
Claim 8
Dependent Claim
132 words
A blower for use in a portable hair dryer comprising a duct for the supply of air having an entrance end and an exit end of circular cross section, a centrifugal fan in the form of a circular array of circumferentially spaced, radially extending blades each increasing in width from the root toward the tip with the leading face of each blade being pitched at an acute angle from the axis of rotation and the trailing edge of each blade joining along its length an imperforate disc rotatable with said array of blades, said fan being centrally mounted at the exit end of said duct with the leading edge of the tip of each blade disposed within said duct and the remainder of each blade beyond the exit end of the duct.
Claim 9
Dependent Claim
37 words
A blower as claimed in claim 6 in which the blades have their leading faces convexly curved and the trailing edge of each blade lies in a plane perpendicular to the axis of rotation of the fan.
Claim 10
Dependent Claim
87 words
A blower as claimed in claim 7 in which the angle of pitch of each blade is less thaN 70*, the overall maximum diameter of said array of blades is approximately equal to the diameter of said duct, the spacing between the trailing edge of each blade and the exit end of said duct is equal to at least 10% of the duct diameter, and the radial spacing between the duct and the tip edge of each blade is from 2 to 5% of the duct diameter.
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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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |