John H Wang

US Patent:

6598688, Jul 29, 2003

Filed:

Jul 16, 2001

Appl. No.:

09/906335

Inventors:

John Wang - Oak Brook IL 60523

International Classification:

F21B 1704

US Classification:

175320, 403292, 403300, 403383

Abstract:

A drill member, or âdrill steel,â is used in a drilling system for installing roof bolts in a mine. The drill member comprises an elongated bar having a central through bore and opposite open ends. The bar has a cross section that defines a circular outside perimeter and a polygonal inside perimeter. The polygonal inside perimeter is configured for coupling of the drill steel to drill bits at one end and to a motorized drill driving device at an opposite end.

US Patent:

20030198280, Oct 23, 2003

Filed:

Apr 22, 2002

Appl. No.:

10/127118

Inventors:

John Wang - Algonquin IL, US
Dawn Close - West Palm Beach FL, US

International Classification:

H04B001/713

US Classification:

375/132000

Abstract:

The frequency hopping adaptation algorithm is an interference avoidance algorithm allowed by the U.S. FCC for ISM band spread spectrum systems. The frequency hopping adaptation algorithm is designed for ISM band frequency hopping systems such as IEEE 802.11 FH, HomeRF 2.0 (including wide band frequency hopping), Bluetooth and other frequency hopping systems.

US Patent:

20130112481, May 9, 2013

Filed:

Nov 8, 2011

Appl. No.:

13/291811

Inventors:

John Wang - Oak Brook IL, US

International Classification:

E21B 7/00
E21B 17/00

US Classification:

175 57, 175320

Abstract:

A drilling system for drilling vertical holes in a mine roof includes a chuck configured to be driven in rotation by a motorized drill head. The chuck is cylindrical has a bore having a first polygonal inside perimeter. A drill member has an elongated hollow body with a cross section defining a circular outside perimeter over most of its length and a constant, second polygonal inside perimeter along substantially the entire length of the drill member. The drill member has at least one end region having a first polygonal outside perimeter that is sized to fit into the first polygonal inside perimeter to rotationally engage the drill member with the chuck. Drill bits having a bit fixture having a cross section with a second polygonal outside perimeter are sized and configured to fit snugly inside the second polygonal inside perimeter to be mounted to the drill member opposite the chuck.