Patents by Inventor Rolf Engelking

Rolf Engelking 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).

  • Air intake pipe for an internal combustion engine
    Patent number: 4197922
    Abstract: An air intake pipe, for mounting to the air filter of an internal combustion engine has two air flow channels having different lengths. A duct is provided between the air flow channels connecting them over their entire length. The duct is dimensioned to provide both sound attenuation and acoustic wave interference between intake noises in the two channels. Thus, the intake pipe acts as an intake noise silencer.
    Type: Grant
    Filed: February 27, 1978
    Date of Patent: April 15, 1980
    Assignee: Volkswagenwerk Aktiengesellschaft
    Inventors: Otto Weber, Volkmar Keck, Rolf Engelking