Granted Patent
Utility
US 5,135,989 · App. 07/460,771
Method of making hydrophobic copolymers hydrophilic
Inventors:
Maris J. Ziemelis, William R. R. Park
Patented Case
View Patent ↗
Granted: Aug 4, 1992
Filed: Jan 4, 1990
Inventors
Maris J. Ziemelis
William R. R. Park
Assignee (at issue)
Dow Corning Corporation
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.