Granted Patent
Utility
US 4,407,958 · App. 06/328,847
Slant culture tube rack
Inventor:
Harold F. DeGraff, Jr.
Patented Case
View Patent ↗
Granted: Oct 4, 1983
Filed: Dec 9, 1981
Inventor
Harold F. DeGraff, Jr.
Assignee (at issue)
Sybron Corporation
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.