Location History:
- Lowell, MA (US) (1994)
- North Andover, MA (US) (1995 - 2000)
- Newbury, MA (US) (2005)
Company Filing History:
2 out of 19 
2 out of 800 
2 out of 838 
Years Active: 1994-2005
Title: W Ralph Knowles: Innovator in Particle Beam Technology
Introduction
W Ralph Knowles is an accomplished inventor based in North Andover, MA, with a notable portfolio of six patents. His innovative work primarily focuses on advanced particle beam systems and environmental scanning electron microscopes, pushing the boundaries of technology in his field.
Latest Patents
Among his latest inventions is a Charged Particle Beam System. This system utilizes an ion generator for charge neutralization, designed to maintain adequate gas pressure at the generator while ensuring reduced pressure in the remainder of the vacuum chamber. This innovative approach enables another column to operate within the chamber, either simultaneously or following a considerably expedited evacuation process. This invention proves particularly beneficial for the repair of photolithography masks in dual beam systems.
Another significant patent is the High Temperature Specimen Stage and Detector for an Environmental Scanning Electron Microscope. This state-of-the-art microscope is capable of sustaining specimens at temperatures up to approximately 1500°C. The design includes a specimen chamber that keeps the specimen enveloped in gas, coupled with a heating assembly featuring a non-inductively wound heater coil, positioned to ensure even heating. Additionally, a heat shield assembly is present to mitigate radiant heat loss, with adjustable bias voltages to optimize electron detection and enhance image quality. The invention also incorporates a specimen stage moving assembly, which allows for better field-of-view adjustments during examination.
Career Highlights
W Ralph Knowles has made significant contributions during his tenure at various companies, notably at Electro Scan, Inc. and FEI Company. Throughout his career, he has developed innovative technologies that address challenges within the field of electron microscopy and charged particle systems.
Collaborations
Throughout his career, Knowles has worked alongside esteemed colleagues, including Thomas A Hardt and William G Schultz. Their collaborations have contributed to advancements in the areas of atomic and molecular analysis, helping to solidify Knowles' reputation as a key player in his domain.
Conclusion
W Ralph Knowles stands out as a leading inventor in the realm of particle beam and electron microscopy technologies. With six patents to his name and a wealth of expertise garnered through his career and collaborations, he continues to pave the way for innovation in his field, inspiring future advancements in technological applications.