Patents by Inventor Dieter Gelzenleuchter

Dieter Gelzenleuchter 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).

  • Optical fluorophosphate glass with anomalous positive incremental dispersion and process for making it
    Patent number: 5068209
    Abstract: An optical fluorophosphate glass with an anomalous positive incremental dispersion +.DELTA..nu..sub.e between 11.8 and 12.5, a refractive index n.sub.e between 1.53 and 1.55 and an Abbe coefficient .nu..sub.e between 72.8 and 73.5 has the following atomic composition (in atom %): Mg: 2.0-3.5, Ca: 2.5-4.5, Sr: 13.0-16.0, Ba: 22.0-25.0, Al: 4.5-6.0, K: 0.1-0.3, P: 9.0-12.0, O: 17.0-20.0 and F: 20.0-23.0, the F/P ratio lying between 1.8 and 2.4 and the sum of the alkaline earths between 39.5 and 49. The new glasses are melted from a material having the following initial composition (in wt. %): Ca(PO.sub.3).sub.2 : 1.0-2.5, Ba(PO.sub.3).sub.2 : 23.0-25.5, Al(PO.sub.3).sub.3 : 12.0-14.5, MgF.sub.2 : 6.5-8.5, CaF.sub.2 : 5.5-8.0, SrF.sub.2 : 16.0-19.0, AlF.sub.3 : 10.0-12.5, SrO: 2.0-3.0, BaO: 12.5-14.5 and K.sub.2 TiF.sub.6 : 0.2-0.7, the alkaline earth fluorides content lying between 28.0 and 35.5 and the total content of all fluorides used between 38.2 and 48.7.
    Type: Grant
    Filed: April 10, 1990
    Date of Patent: November 26, 1991
    Assignee: Wild Leitz GmbH
    Inventors: Norbert Meinert, Dieter Gelzenleuchter, Henning Franek