Patents by Inventor Alexandra Romanenko

Alexandra Romanenko 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).

  • Blue background slides from a black and white film process
    Patent number: 4330615
    Abstract: A rapid simple process of making blue background imaged transparent negatives with "white" or transparent letters from high contrast black and white film. The film is exposed, developed and washed according to manufacturer's directions. The same film is then immersed into three different toner solutions, fixed, washed and dried. The product of the process, an imaged transparent negative with blue background and "white" or transparent letters, can be mounted as a slide.
    Type: Grant
    Filed: March 25, 1981
    Date of Patent: May 18, 1982
    Inventor: Alexandra Romanenko