Granted Patent
Utility
US 4,895,840 · App. 07/060,266
N-(aryl-,aryloxy-,arylthio-arylsulfinyl-and arylsulfonyl-)alkyl-N,N'-(or n'n')alkylaminoalkyl ureas and cyanoguanidines
Inventor:
James R. Shanklin, Jr.
Patented Case
View Patent ↗
Granted: Jan 23, 1990
Filed: Jun 10, 1987
Inventor
James R. Shanklin, Jr.
Assignee (at issue)
A. H. Robins Company, Incorporated
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.