Granted Patent
Utility
US 4,535,885 · App. 06/493,752
Pneumatic sealing apparatus
Inventors:
Karl-Heinz Grell, Heinz Krappitz
Patented Case
View Patent ↗
Granted: Aug 20, 1985
Filed: May 11, 1983
Inventors
Karl-Heinz Grell
Heinz Krappitz
Assignee (at issue)
B.A.T. Cigarettenfabriken GmbH
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.