Granted Patent
Utility
US 4,497,825 · App. 06/442,847
Process for the preparation of betaines
Inventor:
Volkbert Bade
Patented Case
View Patent ↗
Granted: Feb 5, 1985
Filed: Nov 16, 1982
Inventor
Volkbert Bade
Assignee (at issue)
Th. Goldschmidt. AG
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.