Drill bit

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Description

FIG. 1 is a side elevational view of a drill bit showing our new design;

FIG. 2 is a side elevation view thereof turned 90.degree. with respect to FIG. 1;

FIG. 3 is an end elevational view thereof; and

FIG. 4 is an elevational view thereof showing the end opposite that in FIG. 3.

Referenced Cited
U.S. Patent Documents
3095935 September 1958 Hildebrandt et al.
4176723 December 4, 1979 Arceneaux
4350215 September 21, 1982 Radtke
4460053 July 17, 1984 Jurgens et al.
4553615 November 19, 1985 Grainger
4660659 April 28, 1987 Short, Jr. et al.
4669556 June 2, 1987 Barr et al.
Patent History
Patent number: D307020
Type: Grant
Filed: Apr 8, 1987
Date of Patent: Apr 3, 1990
Assignee: Lyng Drilling Products A-S (Vanvikan)
Inventors: Bjorn Lyng (Vanvikan), Hans Tronstad (Leksvik)
Primary Examiner: Carmen H. Vales-Lado
Assistant Examiner: Jeffrey Asch
Law Firm: Wenderoth, Lind & Ponack
Application Number: 7/35,722