ALEXANDRIA, Va., June 17 -- United States Patent no. 12,311,231, issued on May 27.
"Variable resistance apparatus and related equipment and methods" was invented by David A. Trevas (Houston).
According to the abstract* released by the U.S. Patent & Trademark Office: "Variable resistance devices and methods are disclosed. Resistance may be determined based on velocity of movement of a component in a variable resistance device. A variable resistance device may include a stator having a tapered internal bore and a plug disposed for longitudinal movement relative to the tapered internal bore to control resistance force. The tapered internal bore in the stator may be designed to yield a linear relationship between change in force and change in...