Granted Patent
Utility
US 5,183,940 · App. 07/884,230
Poly-(n-[2-hydroxybenzyl])-1,2-diaminoethanes
Inventors:
Peter M. Quan, Stephen William Leeming
Patented Case
View Patent ↗
Granted: Feb 2, 1993
Filed: May 11, 1991
Inventors
Peter M. Quan
Stephen William Leeming
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
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.