Granted Patent
Utility
US 4,331,641 · App. 06/092,127
Synthetic crystalline metal silicate compositions and preparation thereof
Inventors:
James A. Hinnenkamp, Vernon V. Walatka, Jr.
Patented Case
View Patent ↗
Granted: May 25, 1982
Filed: Nov 7, 1979
Inventors
James A. Hinnenkamp
Vernon V. Walatka, Jr.
Assignee (at issue)
National Distillers and Chemical 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.