Granted Patent
Utility
US 5,722,355 · App. 08/716,352
Twin-piston engine
Inventors:
Roy Ekdahl, Lars E. Larsson
Patented Case
View Patent ↗
Granted: Mar 3, 1998
Filed: Sep 27, 1996
Inventors
Roy Ekdahl
Lars E. Larsson
Assignee (at issue)
Aktiebolaget Electrolux
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.