Patents by Inventor John Edward Preedy

John Edward Preedy has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Growth of plants
    Patent number: 4012867
    Abstract: A greenhouse cloche etc comprising an outer light transmitting wall relatively impermeable to carbon dioxide and an inner light transmitting wall relatively permeable to carbon dioxide and gas admitting means for introducing carbon dioxide gas into the space between the inner and outer walls.
    Type: Grant
    Filed: April 8, 1976
    Date of Patent: March 22, 1977
    Assignee: The British Petroleum Company Limited
    Inventors: David Lindsay Guy Lainchbury, John Edward Preedy