Granted Patent
Utility
US 4,775,698 · App. 07/169,795
Process for producing porous substantially skinless particles of crosslinked PVC resin
Inventor:
Ross J. Cozens
Patented Case
View Patent ↗
Granted: Oct 4, 1988
Filed: Mar 18, 1988
Inventor
Ross J. Cozens
Assignee (at issue)
B. F. Goodrich Company
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.