Patents by Inventor Allan D. Marwick

Allan D. Marwick 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: 5026682
    Abstract: A superconducting device operable at temperatures in excess of 30.degree. K. and a method for making the device are described. A representative device is an essentially coplanar SQUID device formed in a single layer of high T.sub.c superconducting material, the SQUID device being operable at temperatures in excess of 60.degree. K. High energy beams, for example ion beams, are used to convert selected portions of the high T.sub.c superconductor to nonsuperconductor properties so that the material now has both superconductive regions and nonsuperconductive regions. In this manner a superconducting loop having superconducting weak links can be formed to comprise the SQUID device.
    Type: Grant
    Filed: April 13, 1987
    Date of Patent: June 25, 1991
    Assignee: International Business Machines Corporation
    Inventors: Gregory J. Clark, Richard J. Gambino, Roger H. Koch, Robert B. Laibowitz, Allan D. Marwick, Corwin P. Umbach