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US3786231A Expired / Lapsed US ⏱️ 0.0 years remaining

Electrically heated sauna bath unit

Assignee: Bahco Ventilation AB
•
Filing: 1971-11-02
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Granted: 1974-01-15
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Expires: 1991-11-02
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Abstract

Abstract An electrically heated sauna bath unit has a plurality of electrical heating elements in the form of a flattened helix surrounded by a jacket which defines therewith an air passage through which air heated by the elements flows. The elements define a space forming a substantially vertical column for accomodating a mass of stone material which accumulates heat against a time when water is thrown thereon. The column has a length which is at least twice its width and a width which is about four times the average size of the stone constituting the stone material. In one embodiment the stone material is in direct contact with the heating elements and is divided by vertical plates secured to the elements and extending the full height of the column. In a second embodiment, the stone material is accomodated in a magazine for indirect heating by the elements.

Inventors

  • 👤 N Torvfelt

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 01:55
CPC Classifications
A; A61; A61H; A61H33/00; A61H33/06; A61H33/063

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 123 words
An electrically operated sauna bath for heating stone material or the like comprising a jacket, electrical heating elemeNts in the form of a flattened helix, said jacket surrounding said heating elements and defining therewith an air passage, the air flowing through said passage being heated by said elements, said elements defining a space forming a substantially vertical column for accommodating said stone material which accumulates heat against a time when water is thrown thereon, and a support plate means for supporting said stone material in said column, said column having a crosssectional configuration with a length which is at least twice its width, the width of said column being preferably about four times the average size of the stones constituting said stone material.
Claim 2
Dependent Claim 123 words
An electrically operated sauna bath for heating stone material or the like comprising a jacket, electrical heating elemeNts in the form of a flattened helix, said jacket surrounding said heating elements and defining therewith an air passage, the air flowing through said passage being heated by said elements, said elements defining a space forming a substantially vertical column for accommodating said stone material which accumulates heat against a time when water is thrown thereon, and a support plate means for supporting said stone material in said column, said column having a crosssectional configuration with a length which is at least twice its width, the width of said column being preferably about four times the average size of the stones constituting said stone material.
Claim 3
Dependent Claim 65 words
A sauna bath as claimed in claim 1 further including a plurality of vertically oriented plates arranged perpendicular to the longitudinal axis of the column dividing said column into a number of compartments, each of said plates having slots along the vertical edges thereof for receiving said electrical heating elements, said plates comprising means for conducting heat from said heating elements to said stone material.
Claim 4
Dependent Claim 20 words
A sauna bath as claimed in claim 2 wherein said vertically oriented plates also rest supportably on said support plate.
Claim 5
Dependent Claim 36 words
A sauna bath as claimed in claim 1 including a magazine for accommodating said stone material, said magazine being located within the flattened helical space defined by said heating elements and surrounded by said heating elements.

References Cited (Backward Citations)

CA654810A Cited
CA814548A Cited
US3476913A Cited
US3372264A Cited
US3530277A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-01-14 1977-07-16 1978-01-15 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-01-14 1981-07-16 1982-01-15 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-01-14 1985-07-16 1986-01-15 $7700.00 Window Closed / Lapsed

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