Cupertino, CA, United States of America

John D Fergason


Average Co-Inventor Count = 1.4

ph-index = 16

Forward Citations = 1,209(Granted Patents)


Location History:

  • Sunnyvale, CA (US) (1991 - 1994)
  • Mountanview, CA (US) (1996)
  • Mountain View, CA (US) (1993 - 2000)
  • Cupertino, CA (US) (2003 - 2015)
  • Los Altos, CA (US) (2016 - 2018)

Company Filing History:


Years Active: 1991-2018

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25 patents (USPTO):Explore Patents

Title: The Innovative Mind of John D. Fergason

Introduction: John D. Fergason, based in Cupertino, CA, is a prolific inventor with a remarkable portfolio of 25 patents. His work primarily focuses on advancements in optical technologies and safety systems. Fergason's contributions have significantly influenced various industries, particularly in enhancing the functionality and safety of equipment used in demanding environments.

Latest Patents: Among his latest inventions, Fergason developed an auto-darkening filter for welding shields. This innovative filter features a brightness-sensing unit, an optical shutter, and a processor that adjusts the shading of the lens based on the brightness of the environment. In high-sensitivity mode, the processor manages the optical shutter's state based on the intensity of the incoming light, ensuring optimal safety for welders. In low-sensitivity mode, it maintains visibility until the ambient light exceeds a specific threshold, at which point it can switch to high sensitivity seamlessly.

Another significant patent involves an image acquisition and display system that optimizes visual representation in video images. This system utilizes metadata derived from an area of interest within the image to adjust the overall image signal. The method enhances the visibility and quality of critical details by implementing system-synchronized brightness controls, making it invaluable in professional and creative applications.

Career Highlights: John D. Fergason's career includes tenure at notable companies, such as Osd Envizion Company and Lightswitch Safety Systems, Inc. These positions allowed him to apply his innovative ideas and develop products that have made a lasting impact on the industry.

Collaborations: Throughout his career, Fergason has collaborated with talented professionals, including Jeffrey K. Fergason and James L. Fergason. These partnerships have fostered a creative environment where ideas can flourish and lead to groundbreaking inventions.

Conclusion: John D. Fergason's contributions to the fields of optical technology and safety systems underscore his status as a leading inventor. With a total of 25 patents to his name, his work continues to pave the way for innovations that enhance safety and improve visual technologies. His dedication to advancing these fields marks him as a noteworthy figure in the world of inventions.

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