Granted Patent
Utility
US 4,234,457 · App. 06/044,324
Crystallized silica-alumina cogel and catalyst employing the same
Inventors:
Hamid Alafandi, Dennis Stamires
Patented Case
View Patent ↗
Granted: Nov 18, 1980
Filed: Jun 1, 1979
Inventors
Hamid Alafandi
Dennis Stamires
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.