Granted Patent
Utility
US 4,726,894 · App. 06/935,089
Distillation cut point control
Inventor:
Carroll J. Ryskamp
Patented Case
View Patent ↗
Granted: Feb 23, 1988
Filed: Nov 24, 1986
Inventor
Carroll J. Ryskamp
Assignee (at issue)
Fox Boro Company
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.