Granted Patent
Utility
US 4,286,873 · App. 06/051,811
Refractometer cell with integral lens
Inventor:
William W. Carson
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: Jun 25, 1979
Inventor
William W. Carson
Assignee (at issue)
WATERS GMBH
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.