Granted Patent
Utility
US 4,514,261 · App. 06/646,267
Refining of tertiary butylstyrene
Inventor:
Glen F. Crum
Patented Case
View Patent ↗
Granted: Apr 30, 1985
Filed: Aug 31, 1984
Inventor
Glen F. Crum
Assignee (at issue)
El Paso Products 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.