Granted Patent
Utility
US 4,238,237 · App. 06/113,418
Manufacture of cement by intergrinding carbonaceous fuel
Inventors:
Robert P. Jarrett, Stewart W. Tresouthick
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: Jan 18, 1980
Inventors
Robert P. Jarrett
Stewart W. Tresouthick
Assignee (at issue)
United States Steel 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.