Granted Patent
Utility
US 4,987,882 · App. 07/475,223
Roof mounted kitchen hood grease exhaust blowers
Inventor:
Arnold S. Kaufman
Patented Case
View Patent ↗
Granted: Jan 29, 1991
Filed: Feb 5, 1990
Inventor
Arnold S. Kaufman
Assignee (at issue)
Renco Systems, Inc.
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.