Granted Patent
Utility
US 4,645,618 · App. 06/794,257
Water soluble floors
Inventors:
Duk Hi Lee, Susan Feierberg, Robert E. O'Brien
Patented Case
View Patent ↗
Granted: Feb 24, 1987
Filed: Nov 1, 1985
Inventors
Duk Hi Lee
Susan Feierberg
Robert E. O'Brien
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
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.