Patents by Inventor Willem L. Konijnendijk

Willem L. Konijnendijk 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).

  • Low-pressure mercury vapor discharge lamp
    Patent number: 4370595
    Abstract: Low-pressure mercury vapor discharge lamp suitable for use in photo-therapy and having a glass discharge tube which is opaque to shorter wavelength ultraviolet radiation and bears a luminescent layer on its inside surface. A problem in such lamps is to produce a useful quantity of radiation which is effective for photo-therapy in combination with as low a quantity of erythema-producing radiation as possible. The luminescent layer comprises a luminescent material having the characteristic line emission of gadolinium at 312 nm, and the glass has an absorption edge located between 280 and 305 nm.
    Type: Grant
    Filed: July 2, 1980
    Date of Patent: January 25, 1983
    Assignee: U.S. Philips Corporation
    Inventors: Petrus J. M. Willemsen, Willem L. Konijnendijk, Robert C. Peters
  • Low-pressure mercury vapor discharge lamp
    Patent number: 4354139
    Abstract: A low-pressure mercury vapor discharge lamp for radiation purposes having a discharge tube made of glass with selective transmission, the tube being coated on the inside with a luminescent layer. This layer contains a luminescent material which has the characteristic line emission of gadolinium at 312 nm. The discharge tube is made of glass having an absorption edge located between 260 and 280 nm and the tube has at 312 nm a transmission of at least 80%.
    Type: Grant
    Filed: April 7, 1980
    Date of Patent: October 12, 1982
    Assignee: U.S. Philips Corporation
    Inventors: Willem L. Konijnendijk, Robert C. Peters, Petrus J. M. Willemsen
  • Luminescent material with alkaline earth metal silicate aluminate host lattice and low-pressure mercury vapor discharge lamp containing the same
    Patent number: 4315191
    Abstract: Luminescent alkaline earth metal silicate aluminate defined by the formula Sr.sub.3-a-b Ba.sub.a Ca.sub.b Si.sub.1-y Ge.sub.y Al.sub.10-z Ga.sub.z O.sub.20 ; Ce.sub.p.sup.3+, Eu.sub.q.sup.2+, Tb.sub.r.sup.3+, wherein, if r=0, it holds that0.ltoreq.a+b.ltoreq.1.50.ltoreq.p.ltoreq.0.750.ltoreq.q.ltoreq.0.250.001.ltoreq.p+qand wherein, if p+q=0, it holds that0.ltoreq.a.ltoreq.3.00.ltoreq.b.ltoreq.1.5a+b.ltoreq.3.00.01.ltoreq.r.ltoreq.1.0.The material is used in a luminescent screen, preferably in the luminescent screen of a low-pressure mercury vapor discharge lamp.
    Type: Grant
    Filed: April 16, 1980
    Date of Patent: February 9, 1982
    Assignee: U.S. Philips Corporation
    Inventors: Willem L. Konijnendijk, Gert M. Boogerd, Henricus L. M. Tonnaer
  • Luminescent lead-activated alkaline earth metal rare earth metal borates and mercury vapor discharge lamp containing the same
    Patent number: 4233538
    Abstract: Luminescent lead-activated alkaline earth metal rare earth metal borates having compositions defined by the formula Me.sub.1-p Pb.sub.p La.sub.1-x-y Y.sub.x Gd.sub.y BO.sub.4, where Me represents strontium and/or calcium, where 0.005 .ltoreq.p.ltoreq.0.30 and 0.ltoreq.x.ltoreq.0.1, and where O.ltoreq.y.ltoreq.0.5 when at least 75 mole% of Me is Ca and O.ltoreq.y.ltoreq.0.1 when less than 75 mole% of Me is Ca. The borate may be used in the luminescent screen of low-pressure mercury vapor discharge lamps.
    Type: Grant
    Filed: April 18, 1979
    Date of Patent: November 11, 1980
    Assignee: U.S. Philips Corporation
    Inventors: Willebrordus H. M. M. van de Spijker, Willem L. Konijnendijk