Patents by Inventor Leo Modest Sprengers

Leo Modest Sprengers 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).

  • Discharge tube having two internal electrodes
    Patent number: 3956656
    Abstract: The invention relates to a low-pressure sodium-vapour discharge lamp which contains an excess of sodium. According to the invention the discharge tube contains a capillary connecting duct extending from a pool of liquid sodium. The provision of the capillary connecting duct prevents the power consumption of the lamp from increasing during the life of the lamp.
    Type: Grant
    Filed: November 29, 1974
    Date of Patent: May 11, 1976
    Assignee: U.S. Philips Corporation
    Inventor: Leo Modest Sprengers