Granted Patent
Utility
US 4,861,517 · App. 07/223,286
Method for the preparation of concentrated flowable aqueous solutions of betaines: addition of mineral acid
Inventor:
Volkbert Bade
Patented Case
View Patent ↗
Granted: Aug 29, 1989
Filed: Jul 22, 1988
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.