Patents by Inventor W. Gregory Erf

W. Gregory Erf 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: 4413050
    Abstract: A photographic process, and the product therefrom, comprising over-exposing color positive transparency film in a camera while focused upon an object to produce a latent image of the object upon the film and then developing the latent image upon the film by emersion in appropriate film development materials sequentially, with the emersion time in the first developer substantially reduced from normal to produce a low contrast actual image on the film; and thereafter, projecting and exposing the actual image on the transparency film onto an instant print film which is being maintained at a temperature at least as high as normal ambient exposure temperature prescribed for the instant print film; and then developing the instant print film according to the prescribed procedure at a temperature at least as high as normal ambient development temperature prescribed for the instant print film.
    Type: Grant
    Filed: May 7, 1981
    Date of Patent: November 1, 1983
    Inventor: W. Gregory Erf