Granted Patent
Utility
US 4,536,489 · App. 06/531,096
High pore volume, high purity alumina gels containing a chromium catalyst
Inventors:
Anthony N. Speca, Roger D. Laib
Patented Case
View Patent ↗
Granted: Aug 20, 1985
Filed: Sep 12, 1983
Inventors
Anthony N. Speca
Roger D. Laib
Assignee (at issue)
National Petro Chemicals 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.