Granted Patent
Utility
US 5,576,217 · App. 08/396,124
Solid phase microextraction of trace amounts of organic analytes
Inventor:
C-P. Sherman Hsu
Patented Case
View Patent ↗
Granted: Nov 19, 1996
Filed: Feb 28, 1995
Inventor
C-P. Sherman Hsu
Assignee (at issue)
Mallinckrodt Baker, 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.