Granted Patent
Utility
US 4,570,026 · App. 06/522,603
Production of isobutene from methyl tertiary butyl ether
Inventors:
Donald A. Keyworth, Cecil G. McFarland
Patented Case
View Patent ↗
Granted: Feb 11, 1986
Filed: Aug 12, 1983
Inventors
Donald A. Keyworth
Cecil G. McFarland
Assignee (at issue)
Petro-Tex Chemical Corporation
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.