Granted Patent
Utility
US 5,201,322 · App. 07/501,335
Device for detecting air flow through a passageway
Inventors:
John C. Henry, Kyung-Tae Park
Patented Case
View Patent ↗
Granted: Apr 13, 1993
Filed: Mar 28, 1990
Inventors
John C. Henry
Kyung-Tae Park
Assignee (at issue)
Elf Atochem North America, Inc.
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.