Granted Patent
Utility
US 4,591,068 · App. 06/466,464
Core barrel plug
Inventors:
Ralph W. Tolino, Ronald J. Hopkins, Ray L. Congleton, Craig H. Popalis
Patented Case
View Patent ↗
Granted: May 27, 1986
Filed: Feb 15, 1983
Inventors
Ralph W. Tolino
Ronald J. Hopkins
Ray L. Congleton
Craig H. Popalis
Assignee (at issue)
Westinghouse Electric Company LLC
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.