Granted Patent
Utility
US 4,552,644 · App. 06/583,135
Duocracking process for the production of olefins from both heavy and light hydrocarbons
Inventors:
Axel Johnson, Swami Narayanan, Herman N. Woebcke
Patented Case
View Patent ↗
Granted: Nov 12, 1985
Filed: Feb 24, 1984
Inventors
Axel Johnson
Swami Narayanan
Herman N. Woebcke
Assignee (at issue)
Stone & Webster Engineering Corp.
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.