Granted Patent
Utility
US 4,376,757 · App. 06/256,297
Synthetic crystalline silicate compositions and preparation thereof
Inventors:
James A. Hinnenkamp, Vernon V. Walatka, Jr.
Patented Case
View Patent ↗
Granted: Mar 15, 1983
Filed: Apr 22, 1981
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.