Granted Patent
Utility
US 4,286,466 · App. 06/083,067
Method and apparatus for pneumatically sampling powders
Inventor:
Ralph J. Stewart
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: Oct 9, 1979
Inventor
Ralph J. Stewart
Assignee (at issue)
International Business Machines 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.