Company Filing History:
4 out of 7,865 
1 out of 832,912 Years Active: 1988-1996
Title: The Innovations of John F Dreyer, Jr.
Introduction
John F Dreyer, Jr. is a notable inventor based in Saint Paul, MN (US). He has made significant contributions to the field of projection technology, holding a total of five patents. His work has enhanced the efficiency and functionality of projection systems, making them more versatile for various applications.
Latest Patents
One of his latest patents is for a "Projector with multiple lamp light source." This innovative projection system efficiently combines the output from multiple lamps, focusing their images to a common point. As a result, the projected screen brightness is significantly increased compared to a conventional single lamp of equivalent wattage. Users can adjust the screen brightness by switching individual lamps on or off, allowing for optimal light levels for different types of projection materials.
Another notable patent is the "Reflective overhead projector with alternate light sources." This design features two lamps, enabling a seamless transition from one lamp to another in case of lamp failure. The lamps are strategically arranged to face the center of a circle, where a rotatable planar mirror is positioned. This mirror can be turned to direct light from the selected lamp, and an electrical switch senses the mirror's position to direct power accordingly.
Career Highlights
Throughout his career, John F Dreyer, Jr. has worked with several companies, including the Minnesota Mining and Manufacturing Company. His experience in these organizations has contributed to his innovative approach to projection technology.
Collaborations
John has collaborated with notable individuals such as Neal T Strand and Robert M Fesler. Their combined expertise has likely fostered advancements in the projects they undertook together.
Conclusion
John F Dreyer, Jr. is a distinguished inventor whose work in projection technology has led to significant advancements in the field. His innovative patents demonstrate his commitment to enhancing the efficiency and functionality of projection systems.