Granted Patent
Utility
US 6,651,658 · App. 09/632,099
Portable oxygen concentration system and method of using the same
Inventors:
Theodore B. Hill, Edward A. Radtke, Robert Schneider, James A. Bixby
Patented Case
View Patent ↗
Granted: Nov 25, 2003
Filed: Aug 3, 2000
Inventors
Theodore B. Hill
Edward A. Radtke
Robert Schneider
James A. Bixby
Assignees (at issue)
SEQUAL TECHNOLOGIES INC.
TEIJIN LIMITED
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.