Granted Patent
Utility
US 4,642,833 · App. 06/749,793
Valve assembly
Inventors:
Andries J. Stoltz, Dieter H. F. Kallenbach
Patented Case
View Patent ↗
Granted: Feb 17, 1987
Filed: Jun 28, 1985
Inventors
Andries J. Stoltz
Dieter H. F. Kallenbach
Assignee (at issue)
Coxwold (Proprietary) Limited
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.