Granted Patent
Utility
US 5,081,293 · App. 07/652,616
Process for preparing solid betaines
Inventors:
James E. Borland, Jeffrey W. Perine, Joe D. Sauer, Kim R. Smith
Patented Case
View Patent ↗
Granted: Jan 14, 1992
Filed: Feb 8, 1991
Inventors
James E. Borland
Jeffrey W. Perine
Joe D. Sauer
Kim R. Smith
Assignee (at issue)
Ethyl 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.