Patents by Inventor Michael S. Burnhill

Michael S. Burnhill 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: 4601714
    Abstract: A vaginal device adapted for use as a disposable female contraceptive or as a disposable article for controllably dispensing drugs is provided comprising an outermost layer of resilient, compressible open-celled polymeric foam. Affixed to the outermost foam layer is a non-porous film layer made of a liquid proof, soft elastomeric material. Affixed to the non-porous film layer is another layer of open-celled polymeric foam. The intermediate film layer provides a barrier between the two foam layers. The outermost and innermost foam layers are formed from foams differing basically in density and/or number of pores per inch, with the more dense or smaller pored foam constituting the outermost layer, the outermost layer being adapted to lie against the cervix of the uterus and block the upper vaginal vault.
    Type: Grant
    Filed: March 7, 1984
    Date of Patent: July 22, 1986
    Inventor: Michael S. Burnhill
  • Patent number: 4564362
    Abstract: A vaginal device adapted for use as a disposable female contraceptive or as a disposable article for controllably dispensing drugs is provided comprising an outermost layer of resilient, compressible open-celled polymeric foam. Affixed to the outermost foam layer is a non-porous film layer made of a liquid proof, soft elastomeric material. Affixed to the non-porous film layer is another layer of open-celled polymeric foam. The intermediate film layer provides a barrier between the two foam layers. The outermost and innermost foam layers are formed from foams differing basically in density and/or number of pores per inch, with the more dense or smaller pored foam constituting the outermost layer, the outermost layer being adapted to lie against the cervix of the uterus and block the upper vaginal vault.
    Type: Grant
    Filed: July 7, 1983
    Date of Patent: January 14, 1986
    Inventor: Michael S. Burnhill