Granted Patent
Utility
US 4,840,284 · App. 07/144,376
Sloped bottom tank
Inventor:
Andrew W. Snyder
Patented Case
View Patent ↗
Granted: Jun 20, 1989
Filed: Jan 15, 1988
Inventor
Andrew W. Snyder
Assignee (at issue)
Hoover Limited
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.