Granted Patent
Utility
US 4,613,283 · App. 06/748,821
Liquid ring compressors
Inventor:
Harold K. Haavik
Patented Case
View Patent ↗
Granted: Sep 23, 1986
Filed: Jun 26, 1985
Inventor
Harold K. Haavik
Assignee (at issue)
The Nash Engineering 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.