Granted Patent
Utility
US 5,156,952 · App. 07/523,084
Qualitative immunochromatographic method and device
Inventors:
David J. Litman, Thomas M. Li, Laura L. Buelteman, Emmy T. Wong
Patented Case
View Patent ↗
Granted: Oct 20, 1992
Filed: May 11, 1990
Inventors
David J. Litman
Thomas M. Li
Laura L. Buelteman
Emmy T. Wong
Assignee (at issue)
Syntex (U.S.A.) LLC
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.