African American Inventors - Refrigerator - John Standard

Centuries ago, humans once dug wholes into the ground in order to keep food cool. Over time inventors came up with the brilliant idea to create an actual storage unit that would be more efficient for cooling. By 1891, John Standard brought a few mprovements in refrigerators; including a manually-filled ice department that could be used for chilling. 

His design was used for a few decades, until the 1920's where a few American corporations got to get her and discovered Freon which is still used today.