Granted Patent
Utility
US 4,590,830 · App. 06/583,313
Method and apparatus for controlling casing holdback
Inventors:
Herve D. Duroyon, Jean-Michel M. Sene
Patented Case
View Patent ↗
Granted: May 27, 1986
Filed: Feb 24, 1984
Inventors
Herve D. Duroyon
Jean-Michel M. Sene
Assignee (at issue)
Union Carbide Corporation
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.