Patents by Inventor Martin G. Hammond

Martin G. Hammond 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: 4452527
    Abstract: A photographic enlarger for use in bright light comprises a light-tight space which is enclosed in a casing, a bellows and a box thereon; the box is displaceably mounted on the casing for upward and downward adjustment and contains a light source emanating projecting light, a transparency holder, an enlarging objective and a deflecting mirror. On the floor of the casing a carrier block, which is displaceable freely on the floor in any direction, carries a lenticulated reflecting screen and a hingedly connected masking frame. A light-tightly closable window is provided in the box and permits viewing through the same, when open, the entirety of the surface of the lenticulated screen via the said deflecting mirror. In the front wall of the casing, two handholes having light-tight covering means are provided which allow for manipulation of the carrier block and of the masking frame and also render it possible to switch the light source on and off by means of a light switch inside the casing.
    Type: Grant
    Filed: October 27, 1982
    Date of Patent: June 5, 1984
    Assignee: Ciba-Geigy AG
    Inventors: George F. A. M. Turner, Martin G. Hammond