Location History:
- Verona, PA (US) (1978)
- Pittsburgh, PA (US) (1989 - 2005)
Company Filing History:
3 out of 34 
1 out of 242 
1 out of 832,912 Years Active: 1978-2005
Title: The Innovations of William J. Alexander
Introduction
William J. Alexander is a notable inventor based in Pittsburgh, PA, who has made significant contributions to the field of semiconductor testing. With a total of five patents to his name, he has developed innovative methods and apparatuses that enhance the efficiency and accuracy of semiconductor wafer testing.
Latest Patents
Among his latest patents is a "Method and apparatus for testing semiconductor wafers." This invention features a wafer testing apparatus that includes a sample chuck with a flat surface designed to support a test wafer. The sample chuck is constructed from a conductive metal base structure, which is complemented by a semiconductor layer that defines the flat surface. An electrical test probe is utilized to establish a correction factor for reporting electrical properties at specific locations on the test wafer, ensuring minimal interference from the underlying semiconductor layer and base structure. Another significant patent is the "Sample chuck with compound construction," which describes a sample chuck that supports semiconductor wafers during testing. This chuck consists of an upper layer made from a semiconducting material laminated to a lower layer formed from a conducting material.
Career Highlights
Throughout his career, William J. Alexander has worked with Solid State Measurements, Inc., where he has applied his expertise in semiconductor technology. His innovative approaches have contributed to advancements in the industry, particularly in the area of wafer testing.
Collaborations
William has collaborated with notable individuals in his field, including Michael John Adams and William H. Howland. These partnerships have fostered a collaborative environment that has led to further innovations in semiconductor testing.
Conclusion
William J. Alexander's contributions to semiconductor testing through his patents and collaborations highlight his role as a significant inventor in the field. His work continues to influence advancements in technology and improve testing methodologies.