Inventor
FREASE JERRY E
US6 patents
Patents
6 patentsUS5244314ASep 14, 1993
Expansion assembly
JENNMAR CORP48 citations92
US5082399AJan 21, 1992
Mine roof anchor having adjustable resin retaining washer and expansion shell assembly with friction reducing means
JENNMAR CORP32 citations90
US5302056AApr 12, 1994
Method and apparatus for supporting a mine roof
JENNMAR CORP16 citations81
US5076733ADec 31, 1991
Mine roof anchor assembly having an expansion shell assembly with a friction reducing means
JENNMAR CORP17 citations71
US5450663ASep 19, 1995
Method for fabricating a truss member for a mine roof support
JENNMAR CORP2 citations62
US5505562AApr 9, 1996
Mechanical truss wrench
JENNMAR CORP5 citations61