Patents by Inventor Daniel Earle Speers

Daniel Earle Speers 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: 4029510
    Abstract: An improved silver halide film, multi-solution photographic processing method and compositions having an increased speed of processing while producing good quality images including use of a developer solution having at least two, and preferably three, different developing agents and a fixing solution which is a combination of at least two different fixing agents. The process and compositions are particularly suitable for convenient processing of x-ray film and microfilm under ordinary room temperature conditions and also for processing in small machines. Following processing, a wash in an archival quality promoting solution is beneficial for microfilm. The x-ray film processing compositions find advantageous utility in the processing of dental x-rays and may conveniently be provided in powder form, for packaging and shipping, with dissolution by the end user.
    Type: Grant
    Filed: December 23, 1974
    Date of Patent: June 14, 1977
    Assignee: General Film Development Corporation
    Inventor: Daniel Earle Speers