Patents by Inventor Alexandra Bleicher

Alexandra Bleicher 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).

  • Photographic objective
    Patent number: 11586008
    Abstract: The present invention relates to an objective for photographic applications, comprising, in a sequence from an object side end to an image side end, a first lens group having a positive refractivity with at least one lens, a second lens group having a negative refractivity with a single lens, a third lens group having a negative refractivity with a single lens and a fourth lens group having a positive refractivity with at least one lens, wherein the lenses of the second and third lens groups each have a concave surface which face one another and define an air lens, wherein f1 is the overall focal length of the lenses of the second and third lens groups and f2 is the focal length of the air lens, and wherein the relationship 5.0?f1/f2?9.0 is true.
    Type: Grant
    Filed: July 28, 2020
    Date of Patent: February 21, 2023
    Assignee: Leica Camera AG
    Inventors: Achim Zirkel, Jakob Bleicher, Alexandra Bleicher
  • Photographic Objective
    Publication number: 20210041660
    Abstract: The present invention relates to an objective for photographic applications, comprising, in a sequence from an object side end to an image side end, a first lens group having a positive refractivity with at least one lens, a second lens group having a negative refractivity with a single lens, a third lens group having a negative refractivity with a single lens and a fourth lens group having a positive refractivity with at least one lens, wherein the lenses of the second and third lens groups each have a concave surface which face one another and define an air lens, wherein f1 is the overall focal length of the lenses of the second and third lens groups and f2 is the focal length of the air lens, and wherein the relationship 5.0?f1/f2?9.0 is true.
    Type: Application
    Filed: July 28, 2020
    Publication date: February 11, 2021
    Inventors: Achim Zirkel, Jakob Bleicher, Alexandra Bleicher