Granted Patent
Utility
US 5,149,653 · App. 07/411,473
Preservation of viruses
Inventor:
Bruce Roser
Patented Case
View Patent ↗
Granted: Sep 22, 1992
Filed: Nov 20, 1989
Inventor
Bruce Roser
Assignee (at issue)
Quadrant Bioresources Limited
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.