Granted Patent
Utility
US 4,325,397 · App. 06/178,319
Method to reduce pressure drop in polyamide process piping
Inventor:
Robert A. Lofquist
Patented Case
View Patent ↗
Granted: Apr 20, 1982
Filed: Aug 15, 1980
Inventor
Robert A. Lofquist
Assignee (at issue)
Allied Chemical 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.