Company Filing History:
Years Active: 1992-2007
Title: Innovations of Andrew Freedman
Introduction
Andrew Freedman is a notable inventor based in Chelmsford, MA (US). He has made significant contributions to the field of spectroscopy and thin film technology. With a total of 2 patents, Freedman has demonstrated his expertise and innovative spirit in developing advanced detection systems and materials.
Latest Patents
Freedman's latest patents include a "System and method for trace species detection using cavity attenuated phase shift spectroscopy with an incoherent light source." This invention provides a system that enables the use of incoherent light sources, such as light-emitting diodes (LEDs), for the detection of gaseous species with broadband absorption features, including nitrogen dioxide and halogen gases. The LED serves as an ideal light source due to its ability to be modulated at high frequencies, which eliminates the need for external modulation equipment. Additionally, the stability of the LED's light output is a significant advantage over alternatives like gas discharge or arc lamps.
Another notable patent is for "Low-temperature, photo-induced epitaxy." This process allows for the production of a thin film of epitaxial material on a substrate surface at low temperatures under ultrahigh vacuum conditions. The method involves depositing precursor compounds on the substrate surface at a temperature that prevents substantial dissociation. For example, a mixture of dimethyl tellurium and dimethyl cadmium can be efficiently converted into an epitaxial cadmium telluride crystal using low power, 193 nm laser irradiation at a substrate temperature of -150°C, followed by annealing.
Career Highlights
Freedman is currently employed at Aerodyne Research, Inc., where he continues to push the boundaries of innovation in his field. His work has contributed to advancements in both environmental monitoring and material science.
Collaborations
Freedman has collaborated with notable colleagues, including Paul L Kebabian and Charter D Stinespring, enhancing the impact of his research through teamwork and shared expertise.
Conclusion
Andrew Freedman's contributions to innovation in spectroscopy and thin film technology highlight his role as a leading inventor in his field. His patents reflect a commitment to advancing scientific understanding and practical applications.