Roy Lee Robertson, JR.

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Delbarton, WV, US

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Patents Grantslast 30 patents

Information Patent Grant
Roof bolt anchor with camming element
- Patent number 8,282,318
- Issue date Oct 9, 2012
- Roy Lee Robertson, Jr.
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Bolt anchor
- Patent number 8,215,875
- Issue date Jul 10, 2012
- Roy Lee Robertson, Jr.
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Bolt anchor
- Patent number 7,959,379
- Issue date Jun 14, 2011
- Roy Lee Robertson, Jr.
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Mine roof bolt anchoring system and method
- Patent number 7,179,020
- Issue date Feb 20, 2007
- Roy Lee Robertson, Jr.
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method and apparatus for anchoring a mine roof bolt
- Patent number 6,986,623
- Issue date Jan 17, 2006
- Roy Lee Robertson, Jr.
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
ROOF BOLT ANCHOR WITH CAMMING ELEMENT
- Publication number 20110250022
- Publication date Oct 13, 2011
- Roy Lee Robertson, JR.
- E21 - EARTH DRILLING MINING
Information Patent Application
Bolt Anchor
- Publication number 20110229273
- Publication date Sep 22, 2011
- Roy Lee Robertson, JR.
- E21 - EARTH DRILLING MINING
Information Patent Application
CRIMPED CABLE BOLT HEAD AND ASSEMBLY
- Publication number 20110070048
- Publication date Mar 24, 2011
- Roy Lee Robertson, JR.
- E21 - EARTH DRILLING MINING
Information Patent Application
BOLT ANCHOR
- Publication number 20100221072
- Publication date Sep 2, 2010
- Roy Lee Robertson, JR.
- E21 - EARTH DRILLING MINING