Granted Patent
Utility
US 4,502,714 · App. 06/426,407
Vacuum spool piece and joint
Inventors:
Richard A. Brown, Richard Kevin Wilson
Patented Case
View Patent ↗
Granted: Mar 5, 1985
Filed: Sep 29, 1982
Inventors
Richard A. Brown
Richard Kevin Wilson
Assignee (at issue)
CVI Incorporated
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.