Granted Patent
Utility
US 4,455,842 · App. 06/423,744
Device and method for controlled freezing of cell cultures
Inventor:
David J. Granlund
Patented Case
View Patent ↗
Granted: Jun 26, 1984
Filed: Sep 27, 1982
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.