Patents by Inventor Ferdinand Kellner

Ferdinand Kellner 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).

  • Prism view finder for reflex cameras with built-in exposure meter
    Patent number: 4319815
    Abstract: The subject of the invention is a prism viewfinder for reflex cameras with built-in exposure meter means. It is of the known kind in which the prism has a bevel face reflecting the received image on to a mirror face which in turn reflects in to an eyepiece and a light-sensitive element of the exposure meter means adjacent to this eyepiece. In the present invention the image is also reflected by the mirror face on to an additional plane face and immediately adjacent the light-sensitive element, thereby giving an enhanced image and improved exposure measuring results.
    Type: Grant
    Filed: November 12, 1980
    Date of Patent: March 16, 1982
    Inventor: Ferdinand Kellner
  • Prism viewfinder for reflex cameras with built-in light meter
    Patent number: 4319816
    Abstract: An improved prism viewfinder wherein in the region of the beam-incidence surface of the prism there is provided a partially transmitting mirrored surface which partially reflects the light beam of an angle somewhat greater than 90.degree. onto a light-sensing organ disposed adjacent to the prism.
    Type: Grant
    Filed: December 12, 1980
    Date of Patent: March 16, 1982
    Inventor: Ferdinand Kellner
  • Photographic camera having long focal length objective
    Patent number: 4226518
    Abstract: In a photographic camera having a long focal length objective, both the objective and a tubular viewfinder extend vertically upwardly adjacent one another from the film carrying part of the camera which facilitates support of the camera in use. Preferably the objective and viewfinder are formed as a periscope arrangement with the light-admitting end of the objective being higher than the eyepiece of the viewfinder.
    Type: Grant
    Filed: May 11, 1979
    Date of Patent: October 7, 1980
    Inventor: Ferdinand Kellner
  • Closeup focusing mechanism for an objective of long focal length
    Patent number: 4213686
    Abstract: In a closeup focusing mechanism for objectives of long focal length, a tube carried between the objective housing and a camera mounting means telescopes into and out of the objective housing. The camera mounting means carries an axially extending rod externally of the tube which is guided in a guide carried by the objective housing. Thus the tube does not rotate relative to the housing.
    Type: Grant
    Filed: July 12, 1979
    Date of Patent: July 22, 1980
    Inventor: Ferdinand Kellner
  • Bellows setting equipment
    Patent number: 4095246
    Abstract: Equipment for the setting of the bellows between an objective and a camera. An arrangement is devised to reduce play and inaccuracy by the use of a control and operating member acting on an intermediate element of a gear train between the elements controlling the diaphragm setting at the objective and thus controlling the diaphragm setting at the camera.
    Type: Grant
    Filed: March 3, 1977
    Date of Patent: June 13, 1978
    Inventor: Ferdinand Kellner