Granted Patent
Utility
US 4,901,448 · App. 07/334,186
Suspension preheater
Inventors:
Wolfgang Rother, Heinz-Herbert Schmits, Heinz-Werner Thiemeyer
Patented Case
View Patent ↗
Granted: Feb 20, 1990
Filed: Apr 6, 1989
Inventors
Wolfgang Rother
Heinz-Herbert Schmits
Heinz-Werner Thiemeyer
Assignee (at issue)
Krupp Polysius 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.