David C Schumaker

US Patent:

48006653, Jan 31, 1989

Filed:

May 31, 1988

Appl. No.:

7/200505

Inventors:

David C. Schumaker - Ferndale MI

International Classification:

F41C 2700

US Classification:

42 7102

Abstract:

A clip for a pistol having a pivotal grip safety holds the grip safety in a forward depressed position allowing operation of the firing mechanism of the pistol when the trigger is pulled. The clip is in the form of a thin band having first and second opposed legs and a flange formed at one end of each of the first and second legs and extending away from the respective leg toward the opposed leg. A central portion extends between and is joined to the opposite ends of the first and second legs and is configured to engage the pistol grip safety when the clip is mounted on the grip of the pistol. The distance between the flanges and the central portion of the clip is selected to hold the grip safety in the forward depressed position when the first and second legs in the flanges are mounted in registry with the grip of the pistol and the first and second legs and the central portion surrounds a portion of the grip and the grip safety.

US Patent:

20180085165, Mar 29, 2018

Filed:

Sep 1, 2015

Appl. No.:

14/841703

Inventors:

Rahul Vaidya - Ann Arbor MI, US
Andrew Jason Knapp - Essex, CA
David Wayne Schumaker - Clarkston MI, US

International Classification:

A61B 34/10
A61B 34/00
G16H 30/40

Abstract:

A method of preplanning orthopedic surgery and computer program therefore. The method includes the steps of: importing an x-ray image into an electronic canvas; scaling the x-ray image to determine the pixel to distance ratio; creating on the canvas one or more moveable, rotatable trace overlays of bones or bone fragments visible in the x-ray; inserting onto the canvas one or more moveable, rotatable images of orthopedic implants; and rotating and moving the trace overlays and the images of orthopedic implants into positions depicting the planned surgical outcome.