Roy Lee Robertson JR.

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Delbarton, WV, US

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for secondary roof support in an underground mine
- Patent number 6,682,268
- Issue date Jan 27, 2004
- Earl Products, Inc.
- Roy Lee Robertson
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method and apparatus for re-tensioning a roof bolt in an undergroun...
- Patent number 6,637,980
- Issue date Oct 28, 2003
- Earl Products, Inc.
- Roy Lee Robertson
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
VERSATILE HANGING SYSTEM FOR ROOF SUPPORT SYSTEMS
- Publication number 20160003375
- Publication date Jan 7, 2016
- Roy Lee Robertson
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Application
Torque Tension Breakaway Nut
- Publication number 20150226248
- Publication date Aug 13, 2015
- Roy Lee Robertson
- E21 - EARTH DRILLING MINING
Information Patent Application
Mine roof bolt anchoring system and method
- Publication number 20060018721
- Publication date Jan 26, 2006
- Roy Lee Robertson
- E21 - EARTH DRILLING MINING
Information Patent Application
Method and apparatus for anchoring a mine roof bolt
- Publication number 20050123361
- Publication date Jun 9, 2005
- Roy Lee Robertson
- E21 - EARTH DRILLING MINING
Information Patent Application
Apparatus for providing secondary mine roof support
- Publication number 20040115010
- Publication date Jun 17, 2004
- Roy Lee Robertson
- E21 - EARTH DRILLING MINING
Information Patent Application
Method and apparatus for re-tensioning a roof bolt in an undergroun...
- Publication number 20020064429
- Publication date May 30, 2002
- Roy Lee Robertson
- E21 - EARTH DRILLING MINING
Information Patent Application
Method and apparatus for secondary roof support in an underground mine
- Publication number 20020028113
- Publication date Mar 7, 2002
- Roy Lee Robertson
- E21 - EARTH DRILLING MINING