Patents by Inventor Gottfried Guder

Gottfried Guder 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).

  • Patent number: 4094675
    Abstract: An electrophotographic image carrier is made by depositing an intermediate layer on an electrically conductive substrate and then vapor-depositing, on the intermediate layer, an inorganic photoconductive layer while maintaining the temperature of the substrate during the deposition of the photoconductive layer at a value which is above the melting point of the intermediate layer, but below the damaging temperature of the photoconductive layer.
    Type: Grant
    Filed: July 17, 1974
    Date of Patent: June 13, 1978
    Assignee: LICENTIA Patent-Verwaltungs-G.m.b.H.
    Inventors: Hans-Hermann Beschoner, Gottfried Guder, Hartmut Dulken, Karl-Heinz Kassel
  • Patent number: 4046562
    Abstract: An electrophotographic recording material comprises a photoconductive layer of selenium, selenium compounds, or alloys with selenium, a conductive and flexible substrate, and an intermediate layer between the substrate and photoconductive layer, the intermediate layer being a metal having a modulus of elasticity of less than 6000 kp/mm.sup.2 and a recrystallization temperature of less than 40.degree. C.
    Type: Grant
    Filed: December 19, 1974
    Date of Patent: September 6, 1977
    Assignee: Licentia Patent-Verwaltungs-G.m.b.H.
    Inventors: Wolf Glowinski, Hartmut Dulken, Gottfried Guder, Karl-Heinz Kassel
  • Patent number: 4011079
    Abstract: In the fabrication of an electrophotographic recording material of the type composed of selenium, selenium compounds, or alloys with selenium, the method is simplified by initially vapor-depositing the photoconductive recording material onto a carrier at a temperature below the glass transformation temperature, and then heating the recording material to a higher second temperature range between the glass transformation temperature and a temperature just below that at which the electrophotographic properties of the recording material begin to change.
    Type: Grant
    Filed: August 1, 1974
    Date of Patent: March 8, 1977
    Assignee: Licentia Patent-Verwaltungs-G.m.b.H.
    Inventors: Johannes Berle, Hartmut Dulken, Gottfried Guder, Karl-Heinz Kassel
  • Patent number: 4008082
    Abstract: In the fabrication of an electrophotographic recording material composed of a photoconductive layer of selenium, at least one selenium alloy, or at least one selenium compound applied to a conductive substrate, the quality and durability of the bond between the layer and the substrate is improved by initially vapor-depositing a thin layer of the photoconductive substance while the substrate temperature is above the glass transformation temperature of the substance, and then vapor-depositing the remainder of the intended layer at a substantially lower substrate temperature.
    Type: Grant
    Filed: April 19, 1976
    Date of Patent: February 15, 1977
    Assignee: Licentia Patent-Verwaltungs-G.m.b.H.
    Inventors: Hans-Hermann Beschoner, Hartmut Dulken, Gottfried Guder, Karl-Heinz Kassel
  • Patent number: 3973960
    Abstract: Electrophotographic recording material composed of a layer of selenium, selenium alloys, or selenium compounds, with arsenic as a additive, disposed on a conductive carrier is given improved properties by forming the layer to have a total arsenic content of 1 to 20%, by weight, and a concentration gradient such that the arsenic concentration decreases from the exposed surface of the layer in the direction toward the carrier and has a concentration of at least 13% at the exposed surface of the layer.
    Type: Grant
    Filed: February 1, 1974
    Date of Patent: August 10, 1976
    Assignee: Licentia Patent-Verwaltungs-G.m.b.H.
    Inventors: Hartmut Dulken, Gottfried Guder, Karl-Heinz Kassel