Patent
   D403336
Priority
Dec 02 1997
Filed
Dec 02 1997
Issued
Dec 29 1998
Expiry
Dec 29 2012
Assg.orig
Entity
unknown
3
11
n/a
The ornamental design for a five blade drill bit, as shown and described.

FIG. 1 is a top plan view of a four blade drill bit showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a top, front, left side perspective view thereof.

Arfele, Robert W., Espiritu, George A., Martin, Jr., Ed R.

Patent Priority Assignee Title
D598103, Apr 07 2009 Oral burnisher head
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D775676, Jul 13 2015 Button drill bit
Patent Priority Assignee Title
4373593, Mar 16 1979 Eastman Christensen Company Drill bit
5007493, Feb 23 1990 DRESSER INDUSTRIES, INC , A CORP OF DE Drill bit having improved cutting element retention system
5111895, Mar 11 1988 Reedhycalog UK Limited Cutting elements for rotary drill bits
5159857, Mar 01 1991 Hughes Tool Company Fixed cutter bit with improved diamond filled compacts
5443565, Jul 11 1994 VERVE, L L C Drill bit with forward sweep cutting elements
5549171, Aug 10 1994 Smith International, Inc. Drill bit with performance-improving cutting structure
5551522, Oct 12 1994 Smith International, Inc. Drill bit having stability enhancing cutting structure
5582261, Aug 10 1994 Smith International, Inc. Drill bit having enhanced cutting structure and stabilizing features
5651421, Nov 01 1994 Reedhycalog UK Limited Rotary drill bits
D340248, May 23 1991 DOVER BMCS ACQUISITION CORP Roof drill bit for mining
D351174, May 23 1991 DOVER BMCS ACQUISITION CORP Roof drill bit for mining machine
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Executed onAssignorAssigneeConveyanceFrameReelDoc
Dec 02 1997Dresser Industries, Inc.(assignment on the face of the patent)
Feb 22 1998ARFELE, ROBERT W Dresser Industries, IncASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0090300005 pdf
Feb 23 1998ESPIRITU, GEORGE A Dresser Industries, IncASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0090300005 pdf
Mar 02 1998MARTIN, JR , ED R Dresser Industries, IncASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0090300005 pdf
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