Granted Patent
Utility
US 4,269,593 · App. 06/105,981
Roller grate material bed conveying and heat exchange apparatus providing plural bed depths
Inventors:
Bobby P. Faulkner, Wayne D. Heyer, Michael H. Weinecke
Patented Case
View Patent ↗
Granted: May 26, 1981
Filed: Dec 21, 1979
Inventors
Bobby P. Faulkner
Wayne D. Heyer
Michael H. Weinecke
Assignee (at issue)
Allis-Chalmers Corporation
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.