David W Koch

US Patent:

8636448, Jan 28, 2014

Filed:

Aug 10, 2006

Appl. No.:

11/501826

Inventors:

Mike Brennan - Bristow VA, US
Joram Shenhar - Fairfax VA, US
David Koch - Fredericksburg VA, US
Mark Lombardo - Arlington VA, US
Benjamin Dolgin - Newington VA, US
Luis Giraldo - Fairfax VA, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

E21B 17/22

US Classification:

4052595, 411 82

Abstract:

A method of supporting a substrate includes inserting a rock bolt into a hole and using the rock bolt to form a groove in a wall of the hole when the rock bolt is inserted therein. The rock bolt is caused to interact with the groove in such a way that the rock bolt is secured in the hole at least in part by the interaction.

US Patent:

20050039952, Feb 24, 2005

Filed:

Aug 17, 2004

Appl. No.:

10/919271

Inventors:

John Hill - Woodbridge VA, US
Mike Brennan - Bristow VA, US
Joram Shenhar - Fairfax VA, US
David Koch - Fredericksburg VA, US
Mark Lombardo - Arlington VA, US
Benjamin Dolgin - Newington VA, US
Luis Giraldo - Fairfax VA, US

International Classification:

E21B010/40
E21B010/36

US Classification:

175057000, 175388000, 175394000

Abstract:

A helical drag bit provided with spirally/helically positioned cutting arms. The arms can create a spiral trench geometry in the sidewall of a predrilled pilot hole. The cutting arms can terminate in scoring cutting blades. The helical drag bit can be incorporated into a system and method for measuring geo-tech characteristics. The helical drag bit can be used in a system and method for improving the holding capacity of rock bolts and similar devices for use in the mining industry or in any circumstances where a particulate substrate may benefit from support. Novel rock bolts having new structures can be used with this improved hole geometry or may form such improved hole geometry.