Kenneth S Coffman

US Patent:

43419968, Jul 27, 1982

Filed:

May 20, 1981

Appl. No.:

6/265475

Inventors:

Kenneth L. Coffman - Indianapolis IN

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G01P 342
G01P 1500

US Classification:

324162

Abstract:

A speed measuring apparatus is provided for indicating a percentage of noal full speed RPM of a jet engine and also for indicating time required for accelerating and decelerating the engine. A generator output is converted to a square wave and a time interval measurement is made between zero crossings of the square wave. The square wave controls the starting and stopping of a time period counter and measured time is converted to percent RPM which is displayed on a digital incandescent display. Similar time periods are measured when the engine is advanced from idle to full power, and also when the engine is retarded from full power to idle.

US Patent:

20180333601, Nov 22, 2018

Filed:

May 18, 2018

Appl. No.:

15/983829

Inventors:

Kenneth Blake Coffman - Indianapolis IN, US

International Classification:

A63B 21/00
A63B 23/12
A63B 1/00
A63B 21/055
A63B 21/04

Abstract:

An exercise device for assistance with handstand push-ups is disclosed. The device may include a base, a support bar attachment mechanism removeably coupled to the base, and a support bar coupled to the support bar attachment mechanism.