Granted Patent
Utility
US 4,470,458 · App. 06/390,688
Well tool
Inventor:
Roger Moore
Patented Case
View Patent ↗
Granted: Sep 11, 1984
Filed: Jun 21, 1982
Inventor
Roger Moore
Assignee (at issue)
Cameron Iron Works, Inc.
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.