Robert Charles Christensen

US Patent:

6644294, Nov 11, 2003

Filed:

Nov 9, 2001

Appl. No.:

10/035480

Inventors:

Robert N. Christensen - Jupiter FL 33477

International Classification:

F41B 1100

US Classification:

124 77, 124 32

Abstract:

A golf ball projecting air cannon capable of propelling a golf ball or similar projectile with high pressure to reach distances beyond 100 yards. The device employs an electronic circuit providing safety, firing, and reloading controls. The timer and motor provide for the timed activation of a series of microswitches and solenoids to distribute air to various ports at a designated position within the device to force appropriate movements.

US Patent:

7235020, Jun 26, 2007

Filed:

Feb 9, 2007

Appl. No.:

11/673244

Inventors:

Robert Christensen - Jupiter FL, US

International Classification:

A63B 69/36

US Classification:

473226, 473233

Abstract:

An indicator mechanism or gauge is located in a golf club and provides an indication that the “sweet spot” on a golf club head has been hit and the speed of the club head. The indicator mechanism includes a sensor mounted on the head of a golf club and an indicator positioned on top of the shaft of the club. The sensor detects the impact of the golf ball and hydraulically transmits this information to the indicator mechanism. A visual indicator protrudes from the top of the golf club shaft and provides an indication of the speed of the golf club.