Granted Patent
Utility
US 4,313,923 · App. 06/220,904
Method of producing pseudoboehmites
Inventors:
Thomas E. Block, Julius Scherzer
Patented Case
View Patent ↗
Granted: Feb 2, 1982
Filed: Dec 29, 1980
Inventors
Thomas E. Block
Julius Scherzer
Assignee (at issue)
Filtrol 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.