Granted Patent
Utility
US 4,642,230 · App. 06/736,555
Release device
Inventors:
Derek J. Whitehead, Michael T. Shepherd
Patented Case
View Patent ↗
Granted: Feb 10, 1987
Filed: May 21, 1985
Inventors
Derek J. Whitehead
Michael T. Shepherd
Assignees (at issue)
Castex Products Limited
The Wellcome Foundation 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.