Granted Patent
Utility
US 4,512,399 · App. 06/481,330
Well packer
Inventors:
John C. Gano, Donald H. Perkins
Patented Case
View Patent ↗
Granted: Apr 23, 1985
Filed: Apr 1, 1983
Inventors
John C. Gano
Donald H. Perkins
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.