Patents by Inventor Johan Egerstroem

Johan Egerstroem 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: 5249789
    Abstract: A sheet film magazine for a film changer has a conveyor for conveying individual film sheets from a film stack to an exposure or receptacle portion of the film changer. The conveyor comprises at least one conveyor wheel which is attached to a shaft that is parallel to the plane of the film sheets and which is driven with a drive mechanism in the conveying direction of the film sheets. The conveyor also has a spacing mechanism for spacing between a film sheet and the conveyor wheel such that the conveyor wheel, when conveying a film sheet from the sheet film magazine to the exposure or receptacle portion, presses against the surface of the film sheet, and is removed from this surface after the end of the film conveying. In order to enable a high film conveying frequency with a conveyor of this type in a simple way, following the end of a film conveying, the conveyor wheel is separated from the surface of the film sheet with the assistance of a separating mechanism.
    Type: Grant
    Filed: January 13, 1993
    Date of Patent: October 5, 1993
    Assignee: Siemens Aktiengesellschaft
    Inventors: Erik Bjoerk, Ola Wiklund, Johan Egerstroem
  • Patent number: 5201510
    Abstract: A sheet film magazine for a film changer comprises a housing and a cover that form a space for storing a stack of unseparated sheets of film that lie against a film plane. The magazine includes a conveyor which is provided for conveying individual sheets of film from the film stack through a film exit opening of the sheet film magazine into a receptacle part of said film changer. So that only one sheet of film is conveyed out of the magazine, the sheet film magazine is provided with a control arrangement adjoining the exit opening and the arrangement guarantees that only one sheet is removed at a time.
    Type: Grant
    Filed: March 2, 1992
    Date of Patent: April 13, 1993
    Assignee: Siemens Aktiengesellschaft
    Inventors: Erik Bjoerk, Ola Wiklund, Johan Egerstroem