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Inventor

WOLFER DALE R

US8 patents
⚠️ This page may combine multiple inventors who share the name “WOLFER DALE R”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

INGERSOLL RAND CO

4 patents
US5562170AOct 8, 1996

Self-lubricating, fluid-actuated, percussive down-the-hole drill

INGERSOLL RAND CO67 citations95
US5794516AAug 18, 1998

Piston for a self-lubricating, fluid-actuated, percussive down-the-hole drill

INGERSOLL RAND CO29 citations92
US5711205AJan 27, 1998

Self-lubricating, fluid-actuated, percussive down-the-hole drill

INGERSOLL RAND CO37 citations92
US5566771AOct 22, 1996

Reversible casing for a self-lubricating, fluid-actuated, percussive down-the-hole drill

INGERSOLL RAND CO31 citations92

HUGHES TOOL CO

1 patent
US4557339ADec 10, 1985

Borehole conditioning apparatus

HUGHES TOOL CO18 citations65

YAO JING JAMES

1 patent
US8561730B2Oct 22, 2013

Foot valve assembly for a down hole drill

YAO JING JAMES3 citations55

PLUNKETT TIMOTHY J

1 patent
US8215419B2Jul 10, 2012

Variable frequency control for down hole drill and method

PLUNKETT TIMOTHY J5 citations55

ATLAS COPCO SECOROC LLC

1 patent
US7832504B2Nov 16, 2010

Exhaust valve and bit assembly for down-hole percussive drills

ATLAS COPCO SECOROC LLC0 citations39