Patents by Inventor David R. Spence

David R. Spence 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).

  • Flat-sided model rocket and method therefor
    Patent number: 5712446
    Abstract: The present invention is directed to an apparatus and method a flat-side model rocket. In the preferred embodiment, the model rocket is four-sided, and may be constructed by a user from wooden pieces that are pre-cut and pre-engraved with a sealed-CO.sub.2 laser. The model rocket of the present invention is compatible with existing model rocket engines, launching apparatuses, and parachute-type recovery apparatuses.
    Type: Grant
    Filed: January 2, 1996
    Date of Patent: January 27, 1998
    Inventor: David R. Spence
  • Tinted bottles for food or drugs
    Patent number: 5643646
    Abstract: A tinted bottle for food or drugs formed by injection blow molding high density polyethylene in which the walls of the bottle have a thickness between about 0.07 and 0.4 inches, a glossy appearance and contact clarity.
    Type: Grant
    Filed: December 12, 1994
    Date of Patent: July 1, 1997
    Inventor: David R. Spence