Patents by Inventor Monique M. F. Eerdekens

Monique M. F. Eerdekens 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).

  • High-pressure sodium discharge lamp
    Patent number: 5153482
    Abstract: The invention relates to a high-pressure sodium discharge lamp provided with a discharge vessel having a ceramic wall and enclosed with intervening space by an outer bulb. The discharge vessel is provided with two electrodes whose respective tips have a mutual distance D. The discharge vessel has a substantially circular cross-section with an interior diameter d.sub.i over the distance D. Under nominal operating conditions, according to the invention, the wall has a wall load of at least 60 W/cm.sup.2, the space between the outer bulb and the discharge vessel contains a gas filling, and D/d.sub.i being >6.
    Type: Grant
    Filed: February 13, 1991
    Date of Patent: October 6, 1992
    Assignee: U.S. Philips Corporation
    Inventors: Robertus A. J. Keijser, Monique M. F. Eerdekens
  • High-pressure sodium discharge lamp having a color temperature of at least 2800.degree. K.
    Patent number: 5097176
    Abstract: The invention relates to a high-pressure sodium discharge lamp which under nominal operating conditions radiates white light with a maximum color rendering index R.sub.a of more than 80. Since the wall load is above 80 W/cm.sup.2 under nominal operating conditions, a color temperature T.sub.c of at least 2800.degree. K. can be achieved with a luminous efficacy of more than 40 lm/W.
    Type: Grant
    Filed: February 13, 1991
    Date of Patent: March 17, 1992
    Assignee: U.S. Philips Corporation
    Inventors: Johannes T. W. De Hair, Johannes H. M. Van Der Sande, Robertus A. J. Keijser, Monique M. F. Eerdekens