Patents by Inventor Harlan S. French

Harlan S. French 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).

  • Safety door edge
    Patent number: 4115952
    Abstract: A door has a flexible channel along its free edge which flexes upon striking an obstruction and brings together two conductive ribbons within the channel. The ribbons are part of an active circuit which includes a relay coil. Temporary contact of the two conductive ribbons resulting from contact with the obstruction de-energizes the relay coil, fully opening the door. Since door opening results from de-energizing a coil, a power or circuit failure will also cause the door to open.
    Type: Grant
    Filed: March 2, 1977
    Date of Patent: September 26, 1978
    Assignee: American Can Company
    Inventor: Harlan S. French