Granted Patent
Utility
US 4,080,311 · App. 05/719,168
Thermally stable phosphate containing alumina precipitates and their method of preparation
Inventor:
William L. Kehl
Patented Case
View Patent ↗
Granted: Mar 21, 1978
Filed: Aug 31, 1976
Inventor
William L. Kehl
Assignee (at issue)
Gulf Research & Development Company
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.