Patent
   D331586
Priority
Oct 09 1990
Filed
Oct 09 1990
Issued
Dec 08 1992
Expiry
Dec 08 2006
Assg.orig
Entity
unknown
0
7
n/a
The ornamental design for an exterior wiper head for drill pipe, as shown and described.

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.

Mason, Ronald J., Mason, Steven B.

Patent Priority Assignee Title
Patent Priority Assignee Title
4494607, May 09 1983 NATIONAL BANK OF ANDREWS Method of cleaning and inhibiting sucker rod corrosion
4703804, Jun 20 1986 Gearhart Industries, Inc. Debris removal and gauge ring device and method
4895205, Oct 19 1987 Pipe washer and chemical applicator system
5101896, Oct 19 1987 Pipe wiper and washer system
223685,
D285798, Jun 09 1983 Set of pillars and bushes
D296559, Nov 13 1984 HARDINGE INC Draw tube adapter
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