Granted Patent
Utility
US 4,500,692 · App. 06/417,306
Process for bead size control in vinyl aromatic suspension polymerization using sodium polystyrenesulphonate
Inventor:
Harold A. Wright
Patented Case
View Patent ↗
Granted: Feb 19, 1985
Filed: Sep 13, 1982
Inventor
Harold A. Wright
Assignee (at issue)
Atlantic Richfield 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.