Patents by Inventor Pentti Kauko Tapani Vaananen

Pentti Kauko Tapani Vaananen 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).

  • Lighting fitting
    Patent number: 4015114
    Abstract: In a lighting fitting having a closed construction wherein the inner spaces of the various parts communicated with each other said inner spaces are connected to the surrounding space through a filter containing filter elements retaining dust and other particles and filter elements adsorbing gases.
    Type: Grant
    Filed: October 14, 1975
    Date of Patent: March 29, 1977
    Assignee: A. Ahlstrom Osakeyhtio
    Inventors: Paavo Antero Paajanen, Pentti Kauko Tapani Vaananen