Granted Patent
Utility
US 4,899,981 · App. 06/809,603
In-run cleanable orifice trap
Inventor:
Roy S. Thomas, Jr.
Patented Case
View Patent ↗
Granted: Feb 13, 1990
Filed: Dec 16, 1985
Inventor
Roy S. Thomas, Jr.
Assignee (at issue)
AlliedSignal, Inc.
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.