Pipeline plug

Description

FIG. 1 is a top plan view of a pipeline plug, showing our new design in an inflated state;

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;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a top plan view thereof, in a deflated state;

FIG. 8 is a side elevational view thereof;

FIG. 9 is a front elevational view thereof;

FIG. 10 is a rear elevational view thereof;

FIG. 11 is a side elevational view thereof and showing the side opposite that of FIG. 8;

FIG. 12 is a bottom plan view thereof;

FIG. 13 is a top plan view of an alternate embodiment, showing our new design in an inflated state;

FIG. 14 is a side elevational view thereof;

FIG. 15 is a front elevational view thereof;

FIG. 16 is a rear elevational view thereof;

FIG. 17 is a rear elevational view thereof and showing the side opposite that of FIG. 14;

FIG. 18 is a bottom plan view thereof; and,

FIG. 19 is a perspective view of the pipeline plug of FIG. 1 and which shows our new design of a pipeline plug in an inflated state.

Referenced Cited
U.S. Patent Documents
D339949 October 5, 1993 Wei et al.
D339950 October 5, 1993 Jung
414748 November 1889 Bentley
754329 March 1904 Milliken
1349072 August 1920 Lines
1760750 April 1928 Goodman
3276481 August 1964 McNulty
3414140 August 1966 Feldkamp
4492095 January 8, 1985 Brister
4612961 September 23, 1986 Vetter
4627470 December 9, 1986 Carruthers
5240031 August 31, 1993 Vigil
Other references
  • Cherne Industries Incorporated, Cherne Single-Size Test-Ball Plug, 1992, Product sheet, 1 page.
Patent History
Patent number: D378695
Type: Grant
Filed: May 19, 1994
Date of Patent: Apr 1, 1997
Assignee: Cherne Industries Incorporated (Minneapolis, MN)
Inventors: Allen D. Mathison (Richfield, MN), Randy D. Smith (New Hope, MN)
Primary Examiner: Louis S. Zarfas
Assistant Examiner: Eric Watterson
Attorney: Anthony G. Eggink
Application Number: 0/23,217
Classifications