Inventor
DURFEE LAVERNE R
US13 patents
⚠️ This page may combine multiple inventors who share the name “DURFEE LAVERNE R”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
IRWIN IND TOOL CO
7 patentsUS7544026B2Jun 9, 2009
Drill bit screw tip
IRWIN IND TOOL CO21 citations92
US9687915B2Jun 27, 2017
Step drill
IRWIN IND TOOL CO11 citations83
USD723896SMar 10, 2015
Fastener attracting device for a driver tool
IRWIN IND TOOL CO10 citations83
US7922429B2Apr 12, 2011
Spade bit
IRWIN IND TOOL CO10 citations83
US7905690B2Mar 15, 2011
Spade bit
IRWIN IND TOOL CO10 citations83
US7316527B2Jan 8, 2008
Lockset drilling guide
IRWIN IND TOOL CO11 citations82
US10328499B2Jun 25, 2019
Step drill
IRWIN IND TOOL CO4 citations72
DURFEE LAVERNE R
5 patentsUS8764355B2Jul 1, 2014
Step drill bit
DURFEE LAVERNE R11 citations82
US8147174B2Apr 3, 2012
Spade bit
DURFEE LAVERNE R10 citations82
US8070397B2Dec 6, 2011
Self feed bit
DURFEE LAVERNE R13 citations82
US8070398B2Dec 6, 2011
Multi-blade self feed bit
DURFEE LAVERNE R15 citations82
US9156094B2Oct 13, 2015
Step drill for wood
DURFEE LAVERNE R8 citations75