Granted Patent
Utility
US 5,339,964 · App. 08/124,404
Method and apparatus for using passive exhaust for pneumatic sorting system
Inventors:
Calvin G. Gray, Frank B. Thomason
Patented Case
View Patent ↗
Granted: Aug 23, 1994
Filed: Sep 20, 1993
Inventors
Calvin G. Gray
Frank B. Thomason
Assignee (at issue)
Simco/Ramic 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.