Granted Patent
Utility
US 4,558,154 · App. 06/257,675
Oxidation of isobutylene oxide to methacrylic acid and methacrolein
Inventors:
Wilfred P. Shum, John F. White, Eva M. Beals
Patented Case
View Patent ↗
Granted: Dec 10, 1985
Filed: Apr 27, 1981
Inventors
Wilfred P. Shum
John F. White
Eva M. Beals
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.