Granted Patent
Utility
US 4,045,500 · App. 05/691,113
Preparation of ethylene glycol
Inventors:
Olav T. Onsager, Peter L. Szecsi
Patented Case
View Patent ↗
Granted: Aug 30, 1977
Filed: May 28, 1976
Inventors
Olav T. Onsager
Peter L. Szecsi
Assignee (at issue)
Halcon International, 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.