Patents by Inventor Ulla Scheer

Ulla Scheer 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).

  • Method for producing a fresnel lens on a catadioptric basis, and a fresnel lens produced using this method
    Patent number: 6252724
    Abstract: The invention relates to a method for producing a Fresnel lens having a staged entrance surface, reflecting surfaces and an exit surface. The entrance surface is subdivided into outer concentric stages and a central part. The central part is aspherically curved on an entrance side and plane on an exit side by satisfying the eikonal condition. Every stage has a top side, underside and outer side, top sides and undersides being of plane design, and the outer sides having curvatures appropriate for satisfying the eikonal condition.
    Type: Grant
    Filed: July 20, 1999
    Date of Patent: June 26, 2001
    Assignee: aqua signal Aktiengesellschaft Spezialleuchfabrik
    Inventor: Ulla Scheer