Granted Patent
Utility
US 5,316,731 · App. 07/973,734
Device for collection and processing of biological samples
Inventors:
W. Juergen Schrenk, Shelby J. Hall
Patented Case
View Patent ↗
Granted: May 31, 1994
Filed: Nov 9, 1992
Inventors
W. Juergen Schrenk
Shelby J. Hall
Assignee (at issue)
Carter Wallace, 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.