Patents by Inventor Erwin Langenbach

Erwin Langenbach 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).

  • Door securing light barrier
    Patent number: 4097733
    Abstract: A door securing light barrier with a plurality of optically active devices, between which the light barrier beam extends through at least part of the door opening and whereof one emits an electrical signal when the light barrier beam is broken, the angle of the light beam of the light beam emitting device being adjustable relative to a fixed casing.
    Type: Grant
    Filed: September 30, 1976
    Date of Patent: June 27, 1978
    Assignee: Erwin Sick Gesellschaft mit beschrankter Haftung Optik-Elektronik
    Inventors: Erwin Langenbach, Karl-Hans Sackmann