Granted Patent
Utility
US 4,172,691 · App. 05/825,133
Sheet metal fan assembly
Inventors:
Everad A. Comstock, Charles L. Smithson, Jr.
Patented Case
View Patent ↗
Granted: Oct 30, 1979
Filed: Aug 16, 1977
Inventors
Everad A. Comstock
Charles L. Smithson, Jr.
Assignee (at issue)
Wallace Murray Corporation
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.