Granted Patent
Utility
US 5,108,595 · App. 07/666,592
Porous silica microspheres having silanol-enriched and silanized surfaces
Inventors:
Joseph J. Kirkland, Jurgen Kohler
Patented Case
View Patent ↗
Granted: Apr 28, 1992
Filed: Mar 8, 1991
Inventors
Joseph J. Kirkland
Jurgen Kohler
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.