Granted Patent
Utility
US 5,284,972 · App. 08/076,446
N-acyl-N,N',N'-ethylenediaminetriacetic acid derivatives and process of preparing same
Inventors:
Brian A. Parker, Barry A. Cullen
Patented Case
View Patent ↗
Granted: Feb 8, 1994
Filed: Jun 14, 1993
Inventors
Brian A. Parker
Barry A. Cullen
Assignee (at issue)
Hampshire Chemical Corp.
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.