Granted Patent
Utility
US 4,271,634 · App. 06/061,255
Channel-shaped sealing strips
Inventor:
Heinz Andrzejewski
Patented Case
View Patent ↗
Granted: Jun 9, 1981
Filed: Jul 27, 1979
Inventor
Heinz Andrzejewski
Assignee (at issue)
Draftex Development A.G.
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.