Granted Patent
Utility
US 5,897,834 · App. 08/819,790
pH test elements
Inventors:
Paul J. Lawrence, Peter U. Ly, David R. Shockey
Patented Case
View Patent ↗
Granted: Apr 27, 1999
Filed: Mar 18, 1997
Inventors
Paul J. Lawrence
Peter U. Ly
David R. Shockey
Assignee (at issue)
Litmus Concepts, 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.