Granted Patent
Utility
US 4,569,833 · App. 06/725,503
Modification of aluminophosphate molecular sieves by treatment with a silicon tetrafluoride gas mixture
Inventors:
Frank P. Gortsema, Brent M. T. Lok
Patented Case
View Patent ↗
Granted: Feb 11, 1986
Filed: Apr 24, 1985
Inventors
Frank P. Gortsema
Brent M. T. Lok
Assignee (at issue)
Union Carbide 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.