Granted Patent
Utility
US 5,224,947 · App. 07/781,089
Soft, readily expandable vacuum bell assembly
Inventors:
Richard N. Cooper, Lawrence M. Smith, Emily Smith
Patented Case
View Patent ↗
Granted: Jul 6, 1993
Filed: Oct 21, 1991
Inventors
Richard N. Cooper
Lawrence M. Smith
Emily Smith
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.