Granted Patent
Utility
US 6,098,581 · App. 09/173,388
Variable valve control for piston internal combustion engine
Inventors:
Walter Buck, Alexander Hiereth
Patented Case
View Patent ↗
Granted: Aug 8, 2000
Filed: Oct 15, 1998
Inventors
Walter Buck
Alexander Hiereth
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.