Patents by Inventor David A. Malrick

David A. Malrick 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).

  • Portable collapsible rickshaw
    Patent number: 7114731
    Abstract: A portable, collapsible rickshaw like carrier has a collapsing main base which allows the rickshaw to be easily stored or transported.
    Type: Grant
    Filed: August 20, 2004
    Date of Patent: October 3, 2006
    Inventor: David A. Malrick
  • Hole saws
    Patent number: 4652185
    Abstract: A device for removing waste plugs from hole saws comprising a plug member positioned internally of a hole saw and retained therein by means of screws or other projections which extend outwardly through cleanout slots of the hole saw. The projections may be joined through an external annular ring which encircles the hole saw. The ring may be grasped and forced downwardly causing the plug member to eject a waste plug from the hole saw. A spring may be positioned between a mandrel of the hole saw and the plug member in order to normally bias a plug member downwardly to assist its positioning and ejectment of a waste plug.
    Type: Grant
    Filed: April 22, 1985
    Date of Patent: March 24, 1987
    Inventor: David A. Malrick