Patents by Inventor Henricus P. J. Jansen

Henricus P. J. Jansen 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 for making a capped electric lamp by using reduced internal pressure to collapse glass
    Patent number: 5986403
    Abstract: A quartz glass vessel having mutually opposed first and second neck-shaped portions is heated over the first neck-shaped portion while flushing the vessel with gas, then pinched over an external current wire and collapsed over a metal foil by means of reduced pressure to form a seal. The second neck-shaped portion may also be collapsed over a metal foil by reduced pressure in the lamp vessel to form a seal. The seals are preferably shaped to form flat external surfaces.
    Type: Grant
    Filed: February 6, 1998
    Date of Patent: November 16, 1999
    Assignee: U.S. Philips Corporation
    Inventors: Henricus P. J. Jansen, Ulrich J. Morschel