Granted Patent
Utility
US 5,011,517 · App. 07/478,523
Sampler for chemical vapors
Inventors:
Brian R. Cage, Arbor D. Drinkwine
Patented Case
View Patent ↗
Granted: Apr 30, 1991
Filed: Feb 12, 1990
Inventors
Brian R. Cage
Arbor D. Drinkwine
Assignee (at issue)
Midwest Research Institute, 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.