Joseph W Stephens

Title: Joseph W. Stephens: Innovator in Extrusion and Video Disc Technology

Introduction

Joseph W. Stephens is a notable inventor based in Plainfield, IN (US). He has made significant contributions to the fields of thermoplastic extrusion and video disc technology. With a total of 3 patents to his name, his work has had a lasting impact on these industries.

Latest Patents

One of his latest patents is an "Apparatus and method for automatically controlling an extruder." This invention describes a method of operating an extruder for thermoplastic material, which automatically controls the output of the extruder. The system includes a kneader screw, a hopper with a feed screw for feeding thermoplastic material, and an outlet feed screw for removing the molten plastic. Each screw is operated by a separate electric motor, and the method involves monitoring the motor current for the kneader screw. Variations in the current indicate changes in the operation of the kneader screw, allowing for adjustments to the speed of the hopper feed screw and outlet feed screw to maintain optimal performance.

Another significant patent is the "Video disc defect detector." This apparatus is designed to detect defects on capacitive video disc records. A pickup stylus spans multiple information tracks and is swept over the recorded disc area by the rotation of the disc. When the stylus encounters a convex surface defect, it is lofted from the disc surface, resulting in a change in capacitance. This change is indicative of the defect's size, and transducers monitor both the radial position of the stylus and the angular position of the disc. Each defect generates a capacitance change, allowing for the recording of the defect's coordinates and magnitude.

Career Highlights

Joseph W. Stephens has worked at RCA Inc., where he has been able to apply his innovative ideas and technical expertise. His contributions to the company have helped advance the technology in both extrusion processes and video disc production.

Collaborations

Throughout his career, Joseph has collaborated with notable coworkers, including Kou-Jay Yang and Howard M. Langley. These partnerships have fostered an environment of innovation and creativity, leading to the development of groundbreaking technologies.

Conclusion

Joseph W. Stephens is a distinguished inventor whose work in thermoplastic extrusion and video disc technology has made a significant impact. His patents reflect his commitment to innovation and excellence in engineering.