Company Filing History:
7 out of 24,194 
1 out of 3 
1 out of 8,684 
Years Active: 1976-2001
Title: The Innovative Contributions of David A. Grafton
Introduction
David A. Grafton is a notable inventor based in Santa Monica, California. He holds a total of nine patents, showcasing his significant contributions to the field of optical technology. His work has had a profound impact on the design and functionality of various optical systems.
Latest Patents
One of Grafton's latest patents is the Variable Ratio Anamorphic Lens. This innovative lens attachment is designed to be used in conjunction with a basic lens, providing a variable anamorphic ratio. The attachment consists of three lens groups: a first lens group with positive refractive power, a second lens group with negative refractive power, and a third lens group with positive refractive power. The second lens group is movably located between the first lens group and the basic lens, while the third lens group is fixed at a distance from the first lens group. This design allows for neutral refractive power in a direction perpendicular to the first, enhancing the versatility of the lens.
Another significant patent is the Multiple Beam Raster Output Scanner Optical System Having Telecentric. This system addresses the issue of differential scan line bow in raster output scanners. By aligning the chief exit ray of each scanning light beam with the system axis, Grafton's design reduces overall bow and ensures that the scan lines from different stations or passes are identical and aligned. This innovation is particularly beneficial for multi-station and multi-pass printers.
Career Highlights
Throughout his career, David A. Grafton has worked with prominent companies such as Xerox Corporation and News America, Inc. His experience in these organizations has allowed him to refine his skills and contribute to groundbreaking advancements in optical technology.
Collaborations
Grafton has collaborated with notable individuals in the field, including Harry P. Brueggemann and Robert K. Hunter, Jr. These partnerships have further enriched his work and led to innovative solutions in optical design.
Conclusion
David A. Grafton's contributions to optical technology through his patents and collaborations highlight his role as a significant inventor in the industry. His innovative designs continue to influence the development of advanced optical systems.