Donald Lee Hall

US Patent:

6789343, Sep 14, 2004

Filed:

Mar 28, 2003

Appl. No.:

10/402468

Inventors:

James P. Dietrich - New Athens IL 62264
Donald R. Hall - Belleville IL 62223

International Classification:

F41A 2100

US Classification:

42 79

Abstract:

An automatic choke system for automatically adjusting the amount of choke applied to a series of shots discharged from shotgun. The automatic choke system includes a tube assembly with a plurality of longitudinal slits within the distal end thereof, a collar unit attached about the tube assembly, and a swedge assembly slidably positioned between the tube assembly and the collar unit. A latch unit attached to the collar unit selectively allows the swedge assembly to move forwardly one position after each shot fired. The latch unit is operated by gas flow from the interior of the barrel of the shotgun during a shot.

US Patent:

59480076, Sep 7, 1999

Filed:

Apr 30, 1997

Appl. No.:

8/847651

Inventors:

Warren Starkebaum - Plymouth MN
Mark T. Rise - Monticello MN
Marc T. Stein - Chandler AZ
Donald L. Hall - Mesa AZ

Assignee:

Medtronic, Inc. - Minneapolis MN

International Classification:

A61N 105

US Classification:

607 67

Abstract:

A first electrical signal and a second electrical signal are transmitted to one or more implanted leads including first and second electrodes, respectively. The first and second signals have a difference in frequency such that the combined potentials induce action potentials in a certain locus of electrically excitable tissue. Means are provided for adjusting the frequency difference, as well as the amplitudes of the signals so that the locus is altered.

US Patent:

61225487, Sep 19, 2000

Filed:

Jul 7, 1999

Appl. No.:

9/348896

Inventors:

Warren Starkebaum - Plymouth MN
Mark T. Rise - Monticello MN
Donald L. Hall - Mesa AZ
Marc T. Stein - Chandler AZ

Assignee:

Medtronic, Inc. - Minneapolis MN

International Classification:

A61N 105
A61N 134

US Classification:

607 67

Abstract:

Undesirable cross-conduction between electrode pairs in a human-implantable dual channel neurostimulator is prevented. The first and second pairs of electrodes may, optionally, share a common electrode. The first electrode pair is stimulated and then recharged. Then, after a finite waiting period has elapsed, the second electrode pair is stimulated and then recharged. Then, after a finite waiting period, the process is repeated. A high impedance state is established across one of the electrode pairs while the other electrode pair is being stimulated and recharged. Such a high impedance state prevents current from flowing through one of the electrode pairs while the other electrode pair is being stimulated or recharged.