Granted Patent
Utility
US 6,412,821 · App. 09/170,091
Device for the vacuum-tight connecting of two bodies of different materials
Inventors:
Winfried Schulmann, Helmut Kaiser, Udo Wenske
Patented Case
View Patent ↗
Granted: Jul 2, 2002
Filed: Oct 13, 1998
Inventors
Winfried Schulmann
Helmut Kaiser
Udo Wenske
Assignee (at issue)
Unaxis Balzers Aktiengesellschaft
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.