Patents by Inventor Rein W. VAN DER Wolf

Rein W. VAN DER Wolf 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).

  • Method of producing a low-pressure mercury vapor discharge lamp
    Patent number: 4324447
    Abstract: Method of producing a low-pressure mercury vapor discharge lamp consisting of two or more parallel discharge tubes which are interconnected by means of a cross-connection. In this method two adjacent discharge tubes are interconnected after the inside of the wall of the tubes has been coated with a luminescent layer and after they have been sealed at one end. The connection between the two tubes is then effected by making an aperture with an outwardly extending collar in the wall of each of the tubes, placing the apertures opposite to one another and fusing the collars together.
    Type: Grant
    Filed: March 14, 1980
    Date of Patent: April 13, 1982
    Assignee: U.S. Philips Corporation
    Inventors: Rein W. van der Wolf, Cornelis J. van den Broek
  • Low-pressure mercury vapor discharge lamp
    Patent number: 4233653
    Abstract: Low-pressure mercury vapor discharge lamp having a luminescent layer and a conductive transparent coating. An amalgam is disposed in the discharge space to reduce loss of light owing to greying of this layer.
    Type: Grant
    Filed: November 16, 1977
    Date of Patent: November 11, 1980
    Assignee: U.S. Philips Corporation
    Inventors: Hermanus M. Jongerius, Rein W. van der Wolf
  • Low-pressure mercury vapor discharge lamp
    Patent number: 4129802
    Abstract: A low-pressure mercury vapor discharge lamp having an internal transmissive starting strip with two separate parts. The separation between the parts is bridged by a narrow straight or helix-shaped conductive connecting strip to bring the total resistance of the starting strip to a value between 50,000 and 150,000 ohms.
    Type: Grant
    Filed: September 6, 1977
    Date of Patent: December 12, 1978
    Assignee: U.S. Philips Corporation
    Inventors: Louis E. Vrenken, Franciscus M. P. Oostvogels, Rein W. VAN DER Wolf