Granted Patent
Utility
US 5,670,098 · App. 08/707,199
Black powder processing on twin-screw extruder
Inventors:
David R. Dillehay, David W. Turner, Jim Blackwell
Patented Case
View Patent ↗
Granted: Sep 23, 1997
Filed: Aug 20, 1996
Inventors
David R. Dillehay
David W. Turner
Jim Blackwell
Assignee (at issue)
Thiokol 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.