Exterior wiper head for drill pipe

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Description

FIG. 1 is a top and front perspective view of an exterior wiper head for drill pipe showing our new design;

FIG. 2 is a bottom and rear perspective view;

FIG. 3 is a side elevational view;

FIG. 4 is another side elevational view;

FIG. 5 is a rear elevational view;

FIG. 6 is a front elevational view;

FIG. 7 is a top plan view; and,

FIG. 8 is a bottom plan view thereof.

FIGS. 1 and 2 have been drawn on an enlarged scale with respect to FIGS. 3-8.

Referenced Cited
U.S. Patent Documents
D223685 May 1972 McPherson
D285798 September 23, 1986 Brunnegard et al.
D296559 July 5, 1988 Drabinski
4494607 January 22, 1985 Ford et al.
4703804 November 3, 1987 Stokes et al.
4895205 January 23, 1990 Thompson et al.
5101896 April 7, 1992 Thompson et al.
Patent History
Patent number: D331586
Type: Grant
Filed: Oct 9, 1990
Date of Patent: Dec 8, 1992
Inventors: Ronald J. Mason (Newcastle, OK), Steven B. Mason (Tuttle, OK)
Primary Examiner: Nelson C. Holtje
Assistant Examiner: Antoine D. Davis
Attorneys: Glen M. Burdick, Bill D. McCarthy
Application Number: 7/694,200
Classifications
Current U.S. Class: Element Or Attachment (D15/138)