Patents by Inventor Manfred Mair

Manfred Mair 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).

  • Lead oxide-free glass, particularly for use in electric lamps
    Patent number: 5180695
    Abstract: A lead oxide free glass of high electrical resistance, easy workability, that is, low abrasive characteristics, and a thermal coefficient of expansion compatible with electrical current supply leads, has an electrical resistance of 10.sup.12 ohm cm at 250.degree. C., and, basically, the following composition:SiO.sub.2 40-60%Al.sub.2 O.sub.3 2-5%CaO 5-10%BaO 20-30%V.sub.2 O.sub.5 2-5%K.sub.2 O 5-7%B.sub.2 O.sub.3 0-5%and additives comprising at least one of MgO, B.sub.2 O.sub.3, each present between 0 and about 5%.
    Type: Grant
    Filed: June 10, 1991
    Date of Patent: January 19, 1993
    Assignee: Patent Treuhand Gesellschaft fur Elektrische Gluhlampen m.b.H.
    Inventors: Werner Weiss, Manfred Mair, Manfred Deisenhofer, Ewald Poesl