Granted Patent
Utility
US 5,924,163 · App. 08/876,146
Demand responsive central vacuum system
Inventor:
James Edward Burns
Patented Case
View Patent ↗
Granted: Jul 20, 1999
Filed: Jun 13, 1997
Inventor
James Edward Burns
Assignee (at issue)
The Spencer Turbine 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.