Granted Patent
Utility
US 5,126,530 · App. 07/619,517
Method for producing hollow gas exchange valves for reciprocating engines
Inventor:
Heinrich Burgmer
Patented Case
View Patent ↗
Granted: Jun 30, 1992
Filed: Nov 29, 1990
Inventor
Heinrich Burgmer
Assignee (at issue)
MERCEDES-BENZ GROUP 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.