Granted Patent
Utility
US 5,996,980 · App. 09/019,080
Rolling sleeve-type gas spring with dust protection
Inventors:
Joachim Frey, Peter Gönnheimer
Patented Case
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Granted: Dec 7, 1999
Filed: Feb 5, 1998
Inventors
Joachim Frey
Peter Gönnheimer
Assignee (at issue)
Daimlerchrysler AG
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.