Backing ring for a pipe coupling

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Description

FIG. 1 is a bottom perspective view of a backing ring for a pipe coupling showing our new design; and

FIG. 2 is a top perspective view thereof.

Referenced Cited
U.S. Patent Documents
D16160 July 1885 Crano
D208388 August 1967 Graham
D240428 July 1976 Hoffman
1940729 December 1933 Pfefferle
2288904 July 1942 Hudson
2412487 December 1946 Amley et al.
2792240 May 1957 Risley et al.
3065000 November 1962 Stanton
3433509 March 1969 Jeffery et al.
Foreign Patent Documents
981721 January 1976 CAX
Patent History
Patent number: D284022
Type: Grant
Filed: Sep 9, 1983
Date of Patent: May 27, 1986
Assignee: Canron Inc. (Toronto)
Inventors: Laverne J. Milot (Mississauga), Kenneth D. Werbowy (Mississauga)
Primary Examiner: James R. Largen
Law Firm: Schwartz, Jeffery, Schwaab, Mack, Blumenthal & Evans
Application Number: 6/530,654
Classifications
Current U.S. Class: D23/43