Granted Patent
Utility
US 5,325,925 · App. 07/904,461
Sealing method and apparatus for wellheads
Inventors:
Jerry D. Smith, Philip Huang
Patented Case
View Patent ↗
Granted: Jul 5, 1994
Filed: Jun 26, 1992
Inventors
Jerry D. Smith
Philip Huang
Assignee (at issue)
Ingram Cactus Company
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.