Heat retrieval unit for installation into a flue duct

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Description

FIG. 1 is a perspective view of a heat retrieval unit for installation into a flue duct, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a view taken from one end thereof;

FIG. 4 is a view taken from the front of the unit;

FIG. 5 is an end view taken from the end of the unit opposite to that of FIG. 3;

FIG. 6 is a rear elevation thereof; and,

FIG. 7 is a bottom plan view thereof.

Referenced Cited
U.S. Patent Documents
2693941 November 1954 Bystrom
3913663 October 1975 Gates
4028817 June 14, 1977 Winstel
4103735 August 1, 1978 Warner
4206804 June 10, 1980 Scholtes et al.
4219073 August 26, 1980 Talmadge et al.
4276929 July 7, 1981 Howard
Patent History
Patent number: D264501
Type: Grant
Filed: Oct 22, 1979
Date of Patent: May 18, 1982
Inventor: Darrow R. Beaton (Minneapolis, MN)
Primary Examiner: Catherine E. Kemper
Attorney: James R. Cwayna
Application Number: 6/87,553
Classifications
Current U.S. Class: D23/136
International Classification: D2303;