Granted Patent
Utility
US 5,739,098 · App. 08/270,489
Crystalline sodium potassium silicates
Inventors:
Raymond P. Denkewicz, Jr., Eric von Rehren Borgstedt
Patented Case
View Patent ↗
Granted: Apr 14, 1998
Filed: Jul 5, 1994
Inventors
Raymond P. Denkewicz, Jr.
Eric von Rehren Borgstedt
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.