Patents by Inventor Joseph R. Purvis

Joseph R. Purvis 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).

  • Adhesively and magnetically holding an article
    Patent number: 4071944
    Abstract: In fabrication of articles, such as semiconductor devices, the articles are adhered to the surface of a magnetized carrier having grooves with a suitable adhesive. Preferably, the grooves are parallel and in sets which intersect each other. The articles are made susceptible to the attraction of a magnetic field. The adhesive is removed by the flow of solvent vapor and liquid through the grooves while the articles are retained in their original position by magnetic forces.In an alternate method, the articles may be adhered initially to a nonmagnetic substrate, made susceptible to the attraction of magnetic field and transferred to a grooved, magnetized carrier. Any adhesive which clings to the articles is removed by solvent vapor and liquid as before.
    Type: Grant
    Filed: October 20, 1975
    Date of Patent: February 7, 1978
    Assignee: Western Electric Co., Inc.
    Inventors: John T. Chuss, Henry H. Krechel, Joseph R. Purvis