This inventor holds 9 USPTO granted patents and 1 EPO patent. Top assignees: Ta Instruments, Inc., Waters Investments Limited, Ta Instruments-Waters LLC. Active years: 1994-2009.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile
Company Filing History:
6 out of 31 
2 out of 137 
1 out of 45 
Years Active: 1994-2009
Title: The Innovations of John W Schaefer
Introduction
John W Schaefer is a notable inventor based in Wilmington, DE (US). He has made significant contributions to the field of thermogravimetric analysis, holding a total of 9 patents. His work focuses on improving the accuracy and reliability of weight measurements during thermal analysis.
Latest Patents
One of his latest patents is titled "System and method for a thermogravimetric analyzer having improved dynamic weight baseline." This invention includes systems and methods for minimizing extraneous forces and calculating corrected weights of samples based on buoyancy factors for a thermogravimetric analyzer (TGA). The TGA features a balance chamber and a furnace designed to heat samples. A null balance is utilized in the balance chamber to measure the sample weight change during heating. The furnace consists of a cylinder that is open at the top to receive a sample, with the bottom closed except for a small hole for a thermocouple. An infrared heat source may be included to heat the cylinder. The balance chamber is thermally isolated from the furnace using an actively cooled plate and a system of heat shields. Additionally, a thermocouple disk is provided to limit gas flow in the furnace, enhancing the reliability of sample weight measurements.
Career Highlights
Throughout his career, John W Schaefer has worked with prominent companies such as TA Instruments, Inc. and Waters Investments Limited. His expertise in thermogravimetric analysis has positioned him as a key figure in the development of innovative analytical instruments.
Collaborations
Some of his notable coworkers include Robert L Danley and Kevin J Reed. Their collaborative efforts have contributed to advancements in the field of thermal analysis.
Conclusion
John W Schaefer's contributions to thermogravimetric analysis through his patents and collaborations highlight his significant impact on the field. His innovative approaches continue to enhance the accuracy and reliability of thermal measurements.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile