Patents by Inventor Roy Hewlett

Roy Hewlett 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).

  • Loose leaf binders
    Patent number: 4200404
    Abstract: A loose leaf binder which can be moulded as an integral structure from resilient plastics, e.g. polypropylene has posts which lie in openings in a side portiion of the binder and are pivotable into the upright position. Projections on the posts or the side portion adjacent the pivotal connection serve to maintain the posts releasably in the upright position. The free ends of the posts are engageable in openings in the other side portion and movable locking members are provided to positively lock the ends of the posts in these openings.
    Type: Grant
    Filed: September 19, 1978
    Date of Patent: April 29, 1980
    Inventors: Kenneth M. Agnew, Charles H. P. Denroche, Roy Hewlett
  • Loose leaf binders
    Patent number: 4000951
    Abstract: A loose leaf binder which can be moulded as an integral structure from resilient plastics, e.g. polypropylene has posts which lie in openings in a side portion of the binder and are pivotable into the upright position. Projections on the posts or the side portion adjacent the pivotal connection serve to maintain the posts releasably in the upright position. The free ends of the posts are engageable in openings in the other side portion and movable locking members are provided to positively lock the ends of the posts in these openings.
    Type: Grant
    Filed: May 6, 1974
    Date of Patent: January 4, 1977
    Inventors: Kenneth Malcolm Agnew, Charles Henry Pentland Denroche, Roy Hewlett