Patents by Inventor Frederick F. Richards, Sr.

Frederick F. Richards, Sr. 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).

  • Replaceable cylinder padlock
    Patent number: 4138868
    Abstract: In a padlock having a ball-locked shackle and a removable key-operated cylinder:A cam retaining means consisting of a serrated pin in combination with a coiled spring;A shackle retaining means comprising a tapped shackle end and a threaded flanged member in conjunction with a ball and cam detent.
    Type: Grant
    Filed: August 19, 1977
    Date of Patent: February 13, 1979
    Inventor: Frederick F. Richards, Sr.