Patents by Inventor Elwood D. Bickford

Elwood D. Bickford 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).

  • Phantom fluorescent lamp with safety switch
    Patent number: 4211958
    Abstract: A safe "phantom" lamp structure for replacing a fluorescent lamp in a two-lamp series circuit connected fluorescent fixture which permits the remaining lamp of the two-lamp fixture to operate. The structure includes, in different embodiments, one or more magnetically or thermally actuated switches which must be closed for completion of the phantom lamp circuit and the switches are closed only after connection of both ends of the phantom lamp to the appropriate fixture sockets.
    Type: Grant
    Filed: February 28, 1977
    Date of Patent: July 8, 1980
    Assignee: Duro-Test Corporation
    Inventors: Elwood D. Bickford, Joel Shurgan