Granted Patent
Utility
US 4,940,737 · App. 07/266,445
Chemically modified hydrophilic prepolymers and polymers
Inventors:
James A. Braatz, Aaron H. Heifetz, Richard A. Wolfe, Narender P. Luthra
Patented Case
View Patent ↗
Granted: Jul 10, 1990
Filed: Nov 2, 1988
Inventors
James A. Braatz
Aaron H. Heifetz
Richard A. Wolfe
Narender P. Luthra
Assignee (at issue)
W.R. Grace & Co. Conn.
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.