Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8065935 | Method of manufacturing a rotary drill bit | William H. Sherwood, Jr., Robert J. Costo, Jr., James L. Duggan | 2011-11-29 |
| 7520345 | Fixed cutter rotary drill bit including support elements affixed to the bit body at least partially defining cutter pocket recesses | William H. Sherwood, Jr., Robert J. Costo, Jr., James L. Duggan | 2009-04-21 |
| 7216565 | Methods of manufacturing and repairing steel body rotary drill bits including support elements affixed to the bit body at least partially defining cutter pocket recesses | William H. Sherwood, Jr., Robert J. Costo, Jr., James L. Duggan | 2007-05-15 |
| 7070011 | Steel body rotary drill bits including support elements affixed to the bit body at least partially defining cutter pocket recesses | William H. Sherwood, Jr., Robert J. Costo, Jr., James L. Duggan | 2006-07-04 |