Pneumatic plug for pipelines

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Description

FIG. 1 is a top plan view of a pneumatic plug for pipelines, showing my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a side elevational view thereof and showing the side opposite that of FIG. 2; and,

FIG. 6 is a bottom plan view thereof.

Referenced Cited
U.S. Patent Documents
3902528 September 1975 Tartabini et al.
3908682 September 1975 Thompson
4614206 September 30, 1986 Mathison et al.
5199463 April 6, 1993 Lippiatt
Other references
  • American Logiball Inc., Logiball-Reinforced Rubber Multi-size Plugs, Product Sheet, 1 page. Cherne Industries Incorporated, Cherne Petro Plug, 1991, Product Sheet, 1 page. Cherne Industries Incorporated, Cherne Neoprene Factory Replaceable Sleeve Multi-Size Muni-Ball Plugs, 1991, 1 page.
Patent History
Patent number: D362713
Type: Grant
Filed: May 17, 1994
Date of Patent: Sep 26, 1995
Assignee: Cherne Industries Incorporated (Minneapolis, MN)
Inventor: Allen D. Mathison (Richfield, MN)
Primary Examiner: Stella Reid
Assistant Examiner: Eric Watterson
Attorney: Anthony G. Eggink
Application Number: 0/23,004
Classifications
Current U.S. Class: Cap, Plug, Vent Or Screen (11) (D23/260)