Granted Patent
Utility
US 6,321,636 · App. 09/343,415
Piston rod-less pneumatic cylinder
Inventors:
Erhard Fritz, Peter Rohatschek
Patented Case
View Patent ↗
Granted: Nov 27, 2001
Filed: Jun 30, 1999
Inventors
Erhard Fritz
Peter Rohatschek
Assignee (at issue)
Hygrama 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.