Granted Patent
Utility
US 4,678,577 · App. 06/769,927
Seamless vessel for self contained filter assembly
Inventors:
Dwight J. Thomas, Charles J. Ashelin
Patented Case
View Patent ↗
Granted: Jul 7, 1987
Filed: Aug 27, 1985
Inventors
Dwight J. Thomas
Charles J. Ashelin
Assignee (at issue)
Kennecott Holdings 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.