Patents by Inventor David R. Johnstone

David R. Johnstone 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).

  • Patent number: 6089517
    Abstract: The mounting assembly is used to mount a toy, doll or stuffed creature to an impervious planar surface. The mounting assembly comprises a suction cup having a base portion and a concave suction portion, a strap having a first end and a second end, and a plug for mounting the strap to the base portion of the suction cup, and a buckle assembly for buckling the strap about a toy, doll or stuffed creature whereby the suction cup enables the toy, doll or stuffed creature to be mounted to an automobile window.
    Type: Grant
    Filed: March 28, 1997
    Date of Patent: July 18, 2000
    Inventor: David R. Johnstone
  • Patent number: 5489619
    Abstract: This invention relates to novel blowing agents comprising a blend of (A) perfluoro- or partially fluorinated-(cyclo)alkanes and (B) one or more of hydrogenated chlorofluorocarbons, hydrogenated fluorocarbons and a low boiling (cyclo)alkane. These blowing agents perform as well as the conventionally used CFC's but are user friendly and do not have the adverse effect of depletion of the ozone layer. These blowing agents are particularly suited for use in producing foams from synthetic polymers and resins, especially phenolic foams of very low and stable thermal conductivity.
    Type: Grant
    Filed: March 14, 1994
    Date of Patent: February 6, 1996
    Assignee: BP Chemicals Limited
    Inventors: Michael A. Barcroft, Kathryn S. Gould, David R. Johnstone, David C. Wilson