Patents by Inventor Graham J. Blake

Graham J. Blake 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).

  • Sterilization indicators containing amino acid(s) and pH indicator
    Patent number: 4328182
    Abstract: An indicator which is used for indicating the completion of a sterilization process in which an article to be sterilized is exposed to formaldehyde vapor either dry or mixed with steam. The indicator comprises a mixture of preferably two amino acids and a pH indicator impregnated in a paper carrier. The amino acids and pH indicator are such that the change point of the pH indicator lies within the range of the change of pH value of the amino acid mix which occurs on exposure of the amino acids to formaldehyde vapor.
    Type: Grant
    Filed: October 16, 1980
    Date of Patent: May 4, 1982
    Assignee: Albert Browne Limited
    Inventor: Graham J. Blake