Granted Patent
Utility
US 4,251,279 · App. 06/017,508
Method of producing alumina-containing fiber and composition therefor
Inventor:
Wendell G. Ekdahl
Patented Case
View Patent ↗
Granted: Feb 17, 1981
Filed: Mar 5, 1979
Inventor
Wendell G. Ekdahl
Assignee (at issue)
Johns Manville
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.