Granted Patent
Utility
US 4,256,232 · App. 06/079,290
Powder composition and method of preparation
Inventors:
Martin J. Hannon, Alex S. Forschirm
Patented Case
View Patent ↗
Granted: Mar 17, 1981
Filed: Sep 27, 1979
Inventors
Martin J. Hannon
Alex S. Forschirm
Assignee (at issue)
Celanese GmbH
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.