Granted Patent
Utility
US 5,221,462 · App. 07/676,043
Methods for retarding coke formation during pyrolytic hydrocarbon processing
Inventors:
Dwight K. Reid, Daniel E. Fields
Patented Case
View Patent ↗
Granted: Jun 22, 1993
Filed: Mar 27, 1991
Inventors
Dwight K. Reid
Daniel E. Fields
Assignee (at issue)
Betz Laboratories, 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.