Patents by Inventor Bela Szeles

Bela Szeles 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).

  • Tungsten-rhenium filament and method for producing same
    Patent number: 6624577
    Abstract: A tungsten-rhenium filament for an operation temperature between 2900 and 3200° K is disclosed. The filament comprises an aluminum-potassium-silicon (AKS) additive. The filament has a grain microstructure comprising substantially exclusively elongated interlocking grains with a Grain Aspect Ratio (GAR) not less than 12. The rhenium content of the filament is between 0.2-0.4% by weight. A method for manufacturing a rhenium-tungsten filament is also disclosed. The method comprises the following steps. An AKS doped tungsten-rhenium alloy powder is prepared with a rhenium content of 0.2-0.4% by weight. The alloy powder is pressed and presintered, and thereafter sintered with direct current. A rhenium-tungsten filament is formed, which has a metastable crystal structure. The filament is annealed below the recrystallisation temperature, and recrystallised above the crystallization temperature. There is also provided a halogen incandescent lamp with a glass envelope enclosing a tungsten-rhenium filament.
    Type: Grant
    Filed: March 19, 2001
    Date of Patent: September 23, 2003
    Assignee: General Electric Company
    Inventors: István Mészáros, Tamás Gál, György Nagy, Béla Szeles
  • Tungsten-rhenium filament and method for producing same
    Publication number: 20020145373
    Abstract: A tungsten-rhenium filament for an operation temperature between 2900 and 3200° K is disclosed. The filament comprises an aluminum-potassium-silicon (AKS) additive. The filament has a grain microstructure comprising substantially exclusively elongated interlocking grains with a Grain Aspect Ratio (GAR) not less than 12. The rhenium content of the filament is between 0,2-0,4% by weight. A method for manufacturing a rhenium-tungsten filament is also disclosed. The method comprises the following steps. An AKS doped tungsten-rhenium alloy powder is prepared with a rhenium content of 0,2-0,4% by weight. The alloy powder is pressed and presintered, and thereafter sintered with direct current. A rhenium-tungsten filament is formed, which has a metastable crystal structure. The filament is annealed below the recrystallisation temperature, and recrystallised above the recrystallisation temperature. There is also provided a halogen incandescent lamp with a glass envelope enclosing a tungsten-rhenium filament.
    Type: Application
    Filed: March 19, 2001
    Publication date: October 10, 2002
    Applicant: General Electric Company
    Inventors: Istvan Meszaros, Tamas Gal, Gyorgy Nagy, Bela Szeles