Granted Patent
Utility
US 6,691,702 · App. 10/134,868
Portable oxygen concentration system and method of using the same
Inventors:
William Appel, David Phillip Winter, Brian Sward, Masato Sugano, Edmund Salter, James A. Bixby
Patented Case
View Patent ↗
Granted: Feb 17, 2004
Filed: Apr 29, 2002
Inventors
William Appel
David Phillip Winter
Brian Sward
Masato Sugano
Edmund Salter
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.