Patent US4300280A successfully refreshed from Google Patents.
US4300280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hair dryer and method for producing a heating element therefor
Assignee: Braun GmbH
•
Filing: 1980-03-25
•
Granted: 1981-11-17
•
Expires: 2000-03-25
Abstract
Abstract An axially compact hair dryer includes a cylindrical outer housing 1, an air outlet 2 at one end of the housing, an air inlet grate 3 at the other end, an electric motor 4 centrally mounted within the housing and driving a blower fan 5, and a generally cylindrical electric heating element 7 disposed in the otherwise wasted annular space between the motor and the housing.
Inventors
- 👤 Rudolf Majthan
- 👤 Rolf Stuhler
- 👤 Raymond G. Parsonage
- 👤 Charles C. Packham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:30
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/16; A; A45; A45D; A45D20/00; A45D20/22; A45D20/38; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49083
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
63 words
A method for making a cylindrical electrical heating element for hair dryers, comprising the following steps: (a) bending a flat strip of material made of Mekanite between two rollers, (b) flattening the bent strip of material, (c) transversely wrapping a heating wire around the strip of material, and (d) bending the strip of material with the heating wire wrapped therearound into a cylinder.
Claim 2
Independent Claim
63 words
A method for making a cylindrical electrical heating element for hair dryers, comprising the following steps: (a) bending a flat strip of material made of Mekanite between two rollers, (b) flattening the bent strip of material, (c) transversely wrapping a heating wire around the strip of material, and (d) bending the strip of material with the heating wire wrapped therearound into a cylinder.
Claim 3
Dependent Claim
17 words
Method according to claim 1, wherein at least one of the two bending rollers is longitudinally fluted.
Claim 4
Dependent Claim
24 words
Method according to claim 1, wherein the strip of material is placed between two sheets of metal and then bent with a bending roller.
References Cited (Backward Citations)
DE1557256C
Cited
US2864929A
Cited
US3680207A
Cited
US3904851A
Cited
US4092626A
Cited
FR2206919B3
Cited
DE2307066A1
Cited
DE2530075B2
Cited
GB1525179A
Cited
US4100673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-16 | 1985-05-18 | 1985-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-16 | 1989-05-18 | 1989-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-16 | 1993-05-18 | 1993-11-17 | $7700.00 | Window Closed / Lapsed |