Granted Patent
Utility
US 5,120,873 · App. 07/723,976
Process for preparing solid betaines
Inventors:
Jeffrey W. Perine, Joe D. Sauer, Kim R. Smith, James E. Borland
Patented Case
View Patent ↗
Granted: Jun 9, 1992
Filed: Jul 1, 1991
Inventors
Jeffrey W. Perine
Joe D. Sauer
Kim R. Smith
James E. Borland
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.