Granted Patent
Utility
US 4,988,195 · App. 07/312,130
Internal reflectance apparatus and method using cylindrical elements
Inventor:
Walter M. Doyle
Patented Case
View Patent ↗
Granted: Jan 29, 1991
Filed: Feb 17, 1989
Inventor
Walter M. Doyle
Assignee (at issue)
Axiom Analytical, Inc.
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.