Granted Patent
Utility
US 4,921,044 · App. 07/023,237
Well injection systems
Inventor:
Andrew G. Cooksey
Patented Case
View Patent ↗
Granted: May 1, 1990
Filed: Mar 9, 1987
Inventor
Andrew G. Cooksey
Assignee (at issue)
Otis Engineering 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.