Granted Patent
Utility
US 4,274,841 · App. 06/134,948
Acetylene recovery process and apparatus
Inventors:
Harvey E. Andresen, Thomas F. Persohn
Patented Case
View Patent ↗
Granted: Jun 23, 1981
Filed: Mar 28, 1980
Inventors
Harvey E. Andresen
Thomas F. Persohn
Assignee (at issue)
Union Carbide 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.