Hot water tank helical coil cleaner

Description

FIG. 1 is a perspective view of a hot water tank helical coil cleaner showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof.

Referenced Cited
U.S. Patent Documents
D234743 April 1975 Andersen
1500852 July 1924 Shepard
1870333 August 1932 Kadavy
2610347 September 1952 Kleiner
Patent History
Patent number: D307961
Type: Grant
Filed: Feb 25, 1987
Date of Patent: May 15, 1990
Inventor: Edward B. Howell (Pocatello, ID)
Primary Examiner: Wallace R. Burke
Assistant Examiner: Lavone D. Tabor
Attorney: Leon Gilden
Application Number: 7/18,978