Expansible sealing plug for pipelines and the like

- Cherne Industries, Inc.
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Description

FIG. 1 is an isometric view taken from the front and side of an expansible sealing plug for pipelines and the like showing my new design;

FIG. 2 is an isometric view taken from the rear and side thereof;

FIG. 3 is an isometric view taken from the front and side of a modified form of the expansible sealing plug for pipelines and the like shown in FIGS. 1 and 2; and

FIG. 4 is an isometric view taken from the rear and side of FIG. 3;

Referenced Cited
U.S. Patent Documents
D209379 November 1967 Quick
D257057 September 23, 1980 Logsdon
437289 September 1890 Clark
2154498 April 1939 Eagar
2720893 October 1955 Foreman
3291156 December 1966 Corsano
3613936 October 1971 Kaiser
4250926 February 17, 1981 Satterwaite et al.
4493344 January 15, 1985 Mathison
4585033 April 29, 1986 Westman
Other references
  • Bailey Brother, Limited, Birmingham England; Drain Test Plugs product brochure, pp. 2 and 3. Maloney Pipeline Products Co., Houston, Texas; Maloney/Foreman Night Caps product brochure, p. 1. Mechanical Research and Design, Inc., Chesapeake, Virginia; "Sealfast" Test Plugs product brochure, pp. 1 and 2. Sidu Manufacturing Company, Inc., Los Alamitos, California; Side Mechanical Sewer Plugs product brochure, p. 2. Vanderlans and Sons, Inc., Lodi, California; "Lansas Sewer Plugs" product brochure, p. 1.
Patent History
Patent number: D300350
Type: Grant
Filed: Dec 12, 1985
Date of Patent: Mar 21, 1989
Assignee: Cherne Industries, Inc. (Minneapolis, MN)
Inventor: Allen D. Mathison (Richfield, MN)
Primary Examiner: James R. Largen
Attorney: Anthony G. Eggink
Application Number: 6/808,064
Classifications
Current U.S. Class: Cap, Plug, Vent Or Screen (11) (D23/260)