Patents by Inventor Paul John Castro

Paul John Castro 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).

  • Balance watch
    Patent number: 6840665
    Abstract: A balance watch, a combination of two watches, one measuring hours, the other measuring minutes and/or seconds. Each watch is worn on a separate wrist simultaneously.
    Type: Grant
    Filed: July 10, 2002
    Date of Patent: January 11, 2005
    Inventor: Paul John Castro
  • Balance watch
    Publication number: 20040008590
    Abstract: A balance watch, a combination of two watches, one measuring hours, the other measuring minutes and/or seconds. Each watch is worn on a separate wrist simultaneously.
    Type: Application
    Filed: July 10, 2002
    Publication date: January 15, 2004
    Inventor: Paul John Castro