Patents by Inventor Charles Ashley-Rollman

Charles Ashley-Rollman 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: 4943770
    Abstract: A device for accurately detecting and monitoring the position of an object inside biological tissue, particularly an endotracheal tube inside a patient's throat, comprising a circuit which generates an electromagnetic field of limited width and depth, and which is disturbed by the presence of material having a high magnetic permeability such as a metal band on the distal end of such an endotracheal tube, but which is otherwise stable and not affected by temperature or other such factors. Included in the invention is a probe for generating the electromagnetic field, which probe is insensitive to temperature changes.
    Type: Grant
    Filed: March 24, 1989
    Date of Patent: July 24, 1990
    Assignee: McCormick Laboratories, Inc.
    Inventors: Charles Ashley-Rollman, Miles C. O'Donnell, William McCormick