Granted Patent
Utility
US 5,312,231 · App. 07/925,373
Slurry conveyor device
Inventor:
Kozaburo Nitta
Patented Case
View Patent ↗
Granted: May 17, 1994
Filed: Aug 4, 1992
Inventor
Kozaburo Nitta
Assignee (at issue)
Compact Engineering LLC
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.