Granted Patent
Utility
US 5,776,893 · App. 08/467,616
Crystalline Hydrated layered sodium and potassium silicates and method of producing same
Inventors:
Eric Borgstedt, Raymond P. Denkewicz, Jr.
Patented Case
View Patent ↗
Granted: Jul 7, 1998
Filed: Jun 6, 1995
Inventors
Eric Borgstedt
Raymond P. Denkewicz, Jr.
Assignee (at issue)
PQ 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.