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The ornamental design for a rotary cone drill bit, as shown. |
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FIG. 1 is a perspective view of the a rotary cone drill bit showing our new design;
FIG. 2 is a first side elevational view thereof;
FIG. 3 is a second side elevational view thereof;
FIG. 4 is a top plan view thereof; and,
FIG. 5 is a bottom plan view thereof.
Huffstutler, Alan Dee, Campos, Jr., Harry Morales
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Sep 12 1995 | Dresser Industries, Inc. | (assignment on the face of the patent) | / | |||
| Jan 13 2003 | DRESSER INDUSTRIES, INC NOW KNOWN AS DII INDUSTRIES, LLC | Halliburton Energy Services, Inc | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 013727 | /0291 |
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