Granted Patent
Utility
US 4,377,077 · App. 06/283,634
Device and method for controlled freezing of cell cultures
Inventor:
David J. Granlund
Patented Case
View Patent ↗
Granted: Mar 22, 1983
Filed: Jul 15, 1981
Inventor
David J. Granlund
Assignee (at issue)
Biotech Research Laboratories
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.