Granted Patent
Utility
US 4,267,769 · App. 06/014,177
Prefabricated knockdown clean room
Inventors:
George B. Davis, Jr., Robert W. Irving
Patented Case
View Patent ↗
Granted: May 19, 1981
Filed: Feb 22, 1979
Inventors
George B. Davis, Jr.
Robert W. Irving
Assignee (at issue)
Environmental Air Control, 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.