Granted Patent
Utility
US 4,703,935 · App. 06/840,157
Expansible duct seal construction for batch mixers and the like
Inventor:
Clarence K. Scherping
Patented Case
View Patent ↗
Granted: Nov 3, 1987
Filed: Mar 17, 1986
Inventor
Clarence K. Scherping
Assignee (at issue)
Baker Perkins Inc.
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.