Patent
   D307020
Priority
Apr 08 1987
Filed
Apr 08 1987
Issued
Apr 03 1990
Expiry
Apr 03 2004
Assg.orig
Entity
unknown
9
7
n/a
The ornamental design for a drill bit, as shown and described.

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° 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.

Lyng, Bjorn, Tronstad, Hans

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D923675, Mar 11 2020 CONPROFE TECHNOLOGY GROUP CO ,LTD Head for end mill
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Patent Priority Assignee Title
3095935,
4176723, Nov 11 1977 DTL, Incorporated Diamond drill bit
4350215, Sep 18 1978 CAMCO INTERNATIONAL INC , A CORP OF DE Drill bit and method of manufacture
4460053, Aug 14 1981 Eastman Christensen Company Drill tool for deep wells
4553615, Feb 20 1982 NL INDUSTRIES, INC Rotary drilling bits
4660659, Feb 22 1983 REED HYCALOG OPERATING LP Drag type drill bit
4669556, Jan 31 1984 REEDHYCALOG, L P Drill bit and cutter therefor
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Executed onAssignorAssigneeConveyanceFrameReelDoc
Mar 26 1987LYNG, BJORNLyng Drilling Products A-SASSIGNMENT OF ASSIGNORS INTEREST 0046900895 pdf
Mar 26 1987TRONSTAD, HANSLyng Drilling Products A-SASSIGNMENT OF ASSIGNORS INTEREST 0046900895 pdf
Apr 08 1987Lyng Drilling Products A-S(assignment on the face of the patent)
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