Patents by Inventor David C. Wentzel

David C. Wentzel 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).

  • Amalgam retainer
    Patent number: 6528953
    Abstract: An arc discharge lamp comprises an arc chamber having an amalgam tip attached to and communicating with it. The communication comprises a narrow tubular extension that penetrates the amalgam tip for a distance less than the depth of the tip. An amalgam that includes bismuth is contained within the amalgam tip. This construction allows operation of the lamp in any position and prevents the bismuth in the amalgam from penetrating the lamp and poisoning the phosphor.
    Type: Grant
    Filed: September 25, 2001
    Date of Patent: March 4, 2003
    Assignee: Osram Sylvania Inc.
    Inventors: Nicolas Pearson, Joseph V. Lima, David C. Wentzel
  • Closed-loop tubular lamp envelope and method of manufacture
    Patent number: 5932961
    Abstract: A closed-loop, tubular lamp envelope and methods of manufacturing closed-loop, tubular lamp envelopes are disclosed. A dome is formed at one end of a light-transmissive tube. A blister is molded on the dome, and a hole is formed in the molded blister. Next, a dome is formed at the other end of the light-transmissive tube. A blister is formed on the dome, and a second hole is formed in the molded blister. Each of the molded blisters includes a rim which defines the respective hole. A second tube is processed in the same way. The respective rims at the ends of the first and second tubes are fused together to form a sealed, closed-loop lamp envelope. Each tube may be bent to provide a desired shape of the lamp envelope. The molding of the rims insures that the sealing surfaces match.
    Type: Grant
    Filed: September 26, 1997
    Date of Patent: August 3, 1999
    Assignee: Osram Sylvania Inc.
    Inventors: David C. Wentzel, Gregory Zaslavsky, Joseph V. Lima
  • Closed-loop tubular lamp envelope and method of manufacture
    Patent number: 5722549
    Abstract: A closed-loop, tubular lamp envelope and methods of manufacturing closed-loop, tubular lamp envelopes are disclosed. A dome is formed at one end of a light-transmissive tube. A blister is molded on the dome, and a hole is formed in the molded blister. Next, a dome is formed at the other end of the light-transmissive tube. A blister is formed on the dome, and a second hole is formed in the molded blister. Each of the molded blisters includes a rim which defines the respective hole. A second tube is processed in the same way. The respective rims at the ends of the first and second tubes are fused together to form a sealed, closed-loop lamp envelope. Each tube may be bent to provide a desired shape of the lamp envelope. The molding of the rims insures that the sealing surfaces match.
    Type: Grant
    Filed: May 22, 1996
    Date of Patent: March 3, 1998
    Assignee: Osram Sylvania Inc.
    Inventors: David C. Wentzel, Gregory Zaslavsky, Joseph V. Lima