Patents by Inventor Henricus L. M. Tonnaer

Henricus L. M. Tonnaer 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).

  • 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