Granted Patent
Utility
US 4,307,902 · App. 06/057,342
Riser connector
Inventor:
Mark A. Schnatzmeyer
Patented Case
View Patent ↗
Granted: Dec 29, 1981
Filed: Jul 13, 1979
Inventor
Mark A. Schnatzmeyer
Assignee (at issue)
Otis Engineering 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.