Granted Patent
Utility
US 4,660,355 · App. 06/817,471
Vacuum adapter for metal-lid canning jars
Inventor:
Hanns J. Kristen
Patented Case
View Patent ↗
Granted: Apr 28, 1987
Filed: Mar 13, 1986
Inventor
Hanns J. Kristen
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.