Francis N Shaffer

Title: Innovations of Francis N. Shaffer

Introduction

Francis N. Shaffer is a notable inventor based in Towanda, PA, with a significant contribution to the field of x-ray phosphors. He holds a total of five patents, showcasing his expertise and innovative spirit in materials science.

Latest Patents

One of his latest patents involves cerium-activated yttrium gadolinium phosphate x-ray phosphors. This invention describes a process for preparing phosphors with a particle size ranging from about 4 to about 12 micrometers through solid-state reaction techniques, followed by firing in a reducing atmosphere to ensure the cerium activator is in the plus 3 valence state. The phosphors can be represented by the formula Y.sub.1-a Gd.sub.a Ce.sub.x PO.sub.4, where 'a' is a value between about 0.05 and about 0.3, and 'x' is a value between about 0.005 and 0.25. Under x-ray excitation, these phosphors exhibit a main band peak emission of approximately 355 nanometers with a main band width of about 15 nanometers. Additionally, he has developed hexagonal hafnium and zirconium phosphate luminescent materials, which are useful in x-ray intensifying screens, providing good image resolution without crossover distortion.

Career Highlights

Throughout his career, Shaffer has worked with prominent companies such as GTE Sylvania Incorporated and GTE Products Corporation. His work has significantly impacted the development of materials used in x-ray technology.

Collaborations

Shaffer has collaborated with notable individuals in his field, including James E. Mathers and Charles F. Chenot. Their combined expertise has contributed to advancements in the technology surrounding x-ray phosphors.

Conclusion

Francis N. Shaffer's innovative contributions to the field of x-ray phosphors and materials science highlight his role as a significant inventor. His patents reflect a commitment to advancing technology and improving imaging techniques.