Granted Patent
Utility
US 5,198,147 · App. 07/683,276
Chemical oxygen generator
Inventors:
Yunchang Zhang, James C. Cannon
Patented Case
View Patent ↗
Granted: Mar 30, 1993
Filed: Apr 10, 1991
Inventors
Yunchang Zhang
James C. Cannon
Assignee (at issue)
Puritan-Bennett Corporation
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.