Granted Patent
Utility
US 4,831,839 · App. 07/117,956
Aerator proportioner for a gravity feed frozen comestible freezer
Inventors:
Donald A. Anderson, Philip L. Davis, Theodore J. Salkowski
Patented Case
View Patent ↗
Granted: May 23, 1989
Filed: Nov 9, 1987
Inventors
Donald A. Anderson
Philip L. Davis
Theodore J. Salkowski
Assignee (at issue)
Stoelting, LLC
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.