Inventor
ESPIRITU GEORGE A
8 patents
Patents
8 patentsUS6131677AOct 17, 2000
Steel-bodied bit
DRESSER IND31 citations91
US5924502AJul 20, 1999
Steel-bodied bit
DRESSER IND16 citations81
USD405811SFeb 16, 1999
Seven blade drill bit
DRESSER IND11 citations72
USD404044SJan 12, 1999
Six blade drill bit
DRESSER IND10 citations72
USD404407SJan 19, 1999
Eight blade drill bit
DRESSER IND2 citations61
USD403335SDec 29, 1998
Four blade drill bit
DRESSER IND4 citations61
USD403336SDec 29, 1998
Five blade drill bit
DRESSER IND3 citations61
USD403003SDec 22, 1998
Nine blade drill bit
DRESSER IND3 citations61