Granted Patent
Utility
US 5,191,143 · App. 07/818,931
Preparation of isobutylene
Inventors:
Wei-Yang Su, William A. Smith, Roya Tooloian
Patented Case
View Patent ↗
Granted: Mar 2, 1993
Filed: Jan 10, 1992
Inventors
Wei-Yang Su
William A. Smith
Roya Tooloian
Assignee (at issue)
Texaco Chemical Inc.
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.