Granted Patent
Utility
US 4,387,008 · App. 06/215,763
Electrodialytic method for production of silica gel
Inventors:
Milton E. Winyall, Charles Davidoff
Patented Case
View Patent ↗
Granted: Jun 7, 1983
Filed: Dec 12, 1980
Inventors
Milton E. Winyall
Charles Davidoff
Assignee (at issue)
W. R. Grace & Co.
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.