Granted Patent
Utility
US 4,335,846 · App. 06/225,273
Three-phase decanter
Inventor:
Leonard Shapiro
Patented Case
View Patent ↗
Granted: Jun 22, 1982
Filed: Jan 15, 1981
Inventor
Leonard Shapiro
Assignee (at issue)
Pennwalt 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.