Granted Patent
Utility
US 4,978,481 · App. 07/297,019
Process for the encapsulation of preformed substrates by graft copolymerization
Inventors:
Robert Allen Janssen, Earl C. McCraw, Jr., Paul C. Nicholson
Patented Case
View Patent ↗
Granted: Dec 18, 1990
Filed: Jan 13, 1989
Inventors
Robert Allen Janssen
Earl C. McCraw, Jr.
Paul C. Nicholson
Assignee (at issue)
Ciba-Geigy
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.