Granted Patent
Utility
US 4,619,561 · App. 06/767,368
Method and apparatus for conveying particulate matter
Inventor:
Jay F. Perkins
Patented Case
View Patent ↗
Granted: Oct 28, 1986
Filed: Aug 20, 1985
Inventor
Jay F. Perkins
Assignee (at issue)
Pacific States Cast Iron Pipe Co.
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.