Mechanical inspection and sealing plug for a monitoring well

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Description

FIG. 1 is a perspective view of the mechanical inspection and sealing plug for a monitoring well showing our new design;

FIG. 2 is a top end view thereof;

FIG. 3 is a lateral view thereof; and,

FIG. 4 is a bottom end view thereof.

Referenced Cited
U.S. Patent Documents
D300350 March 21, 1989 Mathison
D326500 May 26, 1992 Pettesch
3299956 January 1967 Howe
4178966 December 18, 1979 Savor et al.
4202378 May 13, 1980 Bush et al.
4474216 October 2, 1984 Noe
4986313 January 22, 1991 Mounet
5044404 September 3, 1991 Watson
5197605 March 30, 1993 Hampton
Other references
  • Product Brochure, Cherne Industries Incorporated, "CHERNE Kwik 'N Sure Mechanical Plugs", 1989, pp. 1-2. Product Brochure, Cherne Industries Incorporated, "Cherne Monitor Well Locking Plugs 2", 4" & 6" Sizes", 1990, pp. 1-2.
Patent History
Patent number: D351013
Type: Grant
Filed: Jan 15, 1992
Date of Patent: Sep 27, 1994
Assignee: Cherne Industries Incorporated (Minneapolis, MN)
Inventors: Allen D. Mathison (Richfield, MN), Bryan R. Benson (North Branch, MN)
Primary Examiner: Wallace R. Burke
Assistant Examiner: M. H. Tung
Attorney: Anthony G. Eggink
Application Number: 7/821,596