While these awnings might have reached their popularity in the 1950s, the originally filed patent date is 1935, indicating that the awnings were commercially available during the 1930s. Seeing this date has changed my perspective as to when these awnings might have been installed on some buildings.
The “Pan and Cover” assembly method allows for a natural venting action to prevent the build-up of hot air against windows. The unique construction helps keep rain, and debris from penetrating, without trapping heated air underneath. A small amount of light can filter through the awning.
These types of awnings might still be commercially available under the industry term of “Aurora” awning. They appeared to have been manufactured by a subsidiary of Metals USA that was known as Building Products USA, but that website is defunct as of this posting.