Patents by Inventor John R. Crowell

John R. Crowell 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: 4304398
    Abstract: A jig is provided for use in supporting objects from which fingerprints are to be removed or lifted, the operative mechanism comprising a plurality of pivoted arms which can be made to expand or contract to engage a bottle, glass or the like from the inside or the outside, this movement being effected by means of rotating a junction collar to which the arms are pivoted at their inside end about a central shaft, advancing the collar toward or away from a guide disk. A stand is provided into which the shaft is inserted and in which it may be rotated about its longitudinal axis or removed, and a second shaft having a frustoconical stopper on the end may be used in the stand alternatively to the more complicated, expanding-arm structure described above.
    Type: Grant
    Filed: June 2, 1980
    Date of Patent: December 8, 1981
    Inventor: John R. Crowell