Granted Patent
Utility
US 4,246,138 · App. 06/003,793
Crystalline alumino silicate-silica-alumina gel catalysts and processes for producing same
Inventors:
Hamid Alafandi, Dennis Stamires
Patented Case
View Patent ↗
Granted: Jan 20, 1981
Filed: Jan 16, 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.