Granted Patent
Utility
US 5,098,539 · App. 07/688,182
Gel-containing microcapillary column
Inventor:
Chia-Hui Shieh
Patented Case
View Patent ↗
Granted: Mar 24, 1992
Filed: Apr 19, 1991
Inventor
Chia-Hui Shieh
Assignee (at issue)
Beckman Instruments, 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.