Granted Patent
Utility
US 4,460,001 · App. 06/410,272
Process for preparing compound filter
Inventors:
Colin L. Browne, Charles H. Keith, Peter Bohlander
Patented Case
View Patent ↗
Granted: Jul 17, 1984
Filed: Aug 23, 1982
Inventors
Colin L. Browne
Charles H. Keith
Peter Bohlander
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.