Granted Patent
Utility
US 4,797,294 · App. 07/067,022
Chillproofing with magnesium silicate/silica gel agents
Inventor:
Kenneth A. Berg
Patented Case
View Patent ↗
Granted: Jan 10, 1989
Filed: Jun 29, 1987
Inventor
Kenneth A. Berg
Assignee (at issue)
PQ 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.