Patents by Inventor Harald Hettich

Harald Hettich 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).

  • Protective device operating without contact, in particular light barrier grid
    Patent number: 5998785
    Abstract: A protective device operating in contact-free manner, such as in particular a light barrier grid (10), including a transmitter unit and/or a receiver unit (12) for generating and/or for receiving sensing signals, such as in particular light signals which serve for the contact-free monitoring of a protective area. At least the transmitter unit and/or the receiver unit (12) of the protective device is accommodated in a pressure-tight, preferably tubular housing (14), which is at least partly permeable for the sensing signals and which in particular includes cable lead-throughs (16) which ensure explosion protection.
    Type: Grant
    Filed: March 21, 1997
    Date of Patent: December 7, 1999
    Assignee: Sick AG
    Inventors: Michael Beck, Harald Hettich, Karl-Heinz Suss