Granted Patent
Utility
US 4,256,682 · App. 06/127,274
Method of preparing silica gel pellets
Inventor:
Dean A. Denton
Patented Case
View Patent ↗
Granted: Mar 17, 1981
Filed: Mar 5, 1980
Inventor
Dean A. Denton
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.