Granted Patent
Utility
US 4,473,438 · App. 06/260,528
Spray drying method
Inventor:
Valentin R. Loureiro
Patented Case
View Patent ↗
Granted: Sep 25, 1984
Filed: May 4, 1981
Inventor
Valentin R. Loureiro
Assignee (at issue)
Witco Chemical 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.