Granted Patent
Utility
US 4,537,216 · App. 06/630,536
Anti-knock liquid flow control valve
Inventors:
Edwin L. Schwartz, David Frees
Patented Case
View Patent ↗
Granted: Aug 27, 1985
Filed: Jul 13, 1984
Inventors
Edwin L. Schwartz
David Frees
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.