FIRE HYDRANT PATENTS - TRAFFIC MODEL DESIGN
Below are links to some of the patent records dealing with frangible couplings and breakable flanges. This is not a complete listing of every such patent.
A TIFF plug-in may be required by your browser before you can view the patent image files, as explained at the U.S. Patent Office Web-site. The AlternaTIFF plug-in is a free download which you can get at http://www.alternatiff.com/. You'll need to register the plug-in, but it is painless to do so.
The first two patents have the full text in electronic form: all other patents listed here have the text scanned into a TIFF image format. All patent drawings are in the TIFF format.4,747,178 - Mueller Company - 1986
3,961,642 - Waterous Company - 1976
3,506,027 - Dresser Industries - Dresser 300/500 Traffic models - 1970
2,340,965 - Darling Valve - 1944
2,309,238 - William Corey - Iowa Valve hydrants - 1943
2,282,641 - William Corey - Iowa Valve hydrants - 1941
2,249,848 - A.P. Smith - O'Brien model - 1941
1,944,777 - Kennedy Valve - 1934
1,883,467 - Kennedy Valve - 1932
Sample Patent Images, patent# 1,944,777