Granted Patent
Utility
US 4,967,008 · App. 07/464,293
Polyamines and their preparation
Inventors:
Floyd E. Friedli, Robert M. Gilbert
Patented Case
View Patent ↗
Granted: Oct 30, 1990
Filed: Jan 12, 1990
Inventors
Floyd E. Friedli
Robert M. Gilbert
Assignee (at issue)
Sherex Chemical Co., 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.