Company Filing History:
4 out of 8,684 
1 out of 16,080 Years Active: 1980-1986
Title: Innovations and Contributions of John H Pollard
Introduction
John H Pollard is a notable inventor based in Alexandria, VA (US). He has made significant contributions to the field of material analysis and infrared photoconductors. With a total of 5 patents, his work has had a lasting impact on technology and research.
Latest Patents
One of Pollard's latest patents is focused on material analysis using reflected light. This invention involves an apparatus and method for determining the relative proportions of two components of a ternary compound from light reflected off a sample. The light's wavelength is varied, and a graph of reflectance versus wavelength is stored. For a given compound of the general form A.sub.x B.sub.1-x C, the value of x can be determined by converting the stored graph to reflectance versus photon energy. The photon energy for the longest wavelength peak is identified, and x is computed using a specific equation.
Another significant patent involves methods of making infrared photoconductors with passivation control. In this invention, an array of semiconductive photoconductor detectors is formed on a substrate, creating a heterojunction. The array may have a whole or partial overlayer of the same material as the substrate. Ohmic connections are established on the detectors, and conductive read-out leads are connected to these connections. The leads are made of a conductor that forms a Schottky barrier with the substrate and overlayer. This setup allows for a voltage bias to be applied, maximizing sensitivity by controlling the accumulation layer in the substrate beneath the array.
Career Highlights
Throughout his career, John H Pollard has worked with esteemed organizations, including the US Government as represented by the Secretary of the Army and the USA as represented by the Secretary of the Navy. His work in these institutions has contributed to advancements in technology and innovation.
Collaborations
Pollard has collaborated with notable individuals such as William A Gutierrez and John B Ramsey, Jr. These partnerships have further enhanced his contributions to the field.
Conclusion
John H Pollard's innovative patents and career achievements highlight his significant role in advancing technology. His work continues to influence the fields of material analysis and infrared photoconductors.