Granted Patent
Utility
US 4,312,946 · App. 05/362,488
Preparation and use of enzymes bound to polyurethane
Inventors:
Louis L. Wood, Frank J. Hartdegen, Peter Hahn
Patented Case
View Patent ↗
Granted: Jan 26, 1982
Filed: May 21, 1973
Inventors
Louis L. Wood
Frank J. Hartdegen
Peter Hahn
Assignee (at issue)
W. R. Grace & Co.
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.