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The ornamental design for a six blade drill bit, as shown and described. |
FIG. 1 is a top plan view of a six 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.
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Dec 01 1997 | Dresser Industries, Inc. | (assignment on the face of the patent) | / | |||
Feb 22 1998 | ARFELE, ROBERT W | Dresser Industries, Inc | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 009030 | /0005 | |
Feb 23 1998 | ESPIRITU, GEORGE A | Dresser Industries, Inc | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 009030 | /0005 | |
Mar 02 1998 | MARTIN, JR , ED R | Dresser Industries, Inc | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 009030 | /0005 |
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