Patents by Inventor Gerrit D. B. van Houwelingen

Gerrit D. B. van Houwelingen 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).

  • Temperature indicating device using a pressure sensitive polyisobutylene adhesive seal
    Patent number: 4189942
    Abstract: There is provided a temperature indicating device such as a thermometer having a thermally conductive foil as a carrier layer, the carrier layer having one or more cavities formed by depression in the foil material. The depressions are filled with solid mixtures which melt at predetermined temperatures and are composed of ortho-chloronitrobenzene, ortho-bromonitrobenzene, and a dyestuff. A transparent cover layer seals the cavities and their contents. The transparent cover layer and carrier layer are bonded to each other by means of a pressure-sensitive adhesive which includes polyisobutylene.
    Type: Grant
    Filed: April 13, 1978
    Date of Patent: February 26, 1980
    Assignee: Akzona Incorporated
    Inventors: Egenius A. Giezen, Gerrit D. B. van Houwelingen, Marietta Cramer