Granted Patent
Utility
US 4,889,670 · App. 07/162,505
Process for manufacturing green and ceramic foam
Inventors:
Nur R. Gurak, Ronald J. Thompson, James P. Russell, Joseph M. Yarkovsky
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: Mar 1, 1988
Inventors
Nur R. Gurak
Ronald J. Thompson
James P. Russell
Joseph M. Yarkovsky
Assignee (at issue)
BASF SE
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.