Granted Patent
Utility
US 4,201,544 · App. 05/850,088
High pressure heater
Inventors:
Eugene C. Briggs, William E. Gustafson
Patented Case
View Patent ↗
Granted: May 6, 1980
Filed: Nov 10, 1977
Inventors
Eugene C. Briggs
William E. Gustafson
Assignee (at issue)
Keohring 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.