Patents by Inventor Peter R. Hall

Peter R. Hall 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).

  • Optical beam expander
    Patent number: 5574601
    Abstract: A beam expander suitable for use with laser machining apparatus comprises a convex paraboloidal surface 7 and a concave paraboloidal surface 8 formed from a single metal element 10. The expander has an optional zoom facility provided by a plane mirror 12, moveable along an input-output axis, for altering the position of an incident beam on the convex surface 7 thereby altering the magnification of the system.
    Type: Grant
    Filed: October 14, 1994
    Date of Patent: November 12, 1996
    Assignee: British Aerospace Public Limited Company
    Inventor: Peter R. Hall
  • Non-invasive monitoring of cardiac output
    Patent number: 5105815
    Abstract: A device for positioning/retaining a transducer relative to a body characterized in that it comprises a supporting member for placement on the body, connected thereto one end of a flexible and elongate arm, which has a mount for the transducer at or near the remote end thereof, and means for locking the arm in a fixed position relative to the body is disclosed.Also disclosed are an apparatus for monitoring aortic blood velocity and derived parameters by Doppler ultrasound and, optionally, ECG comprising such a device and that use of such an apparatus.
    Type: Grant
    Filed: July 20, 1990
    Date of Patent: April 21, 1992
    Assignee: Abbey Biosystems Limited
    Inventors: Peter R. Hall, Jack Trehearne, Dawood Parker, Paul Clancy
  • Non-invasive monitoring of cardiac output
    Patent number: 5022410
    Abstract: A device for positioning/retaining a transducer relative to a body characterized in that it comprises a supporting member for placement on the body, connected thereto one end of a flexible and elongate arm, which has a mount for the transducer at or near the remote end thereof, and means for locking the arm in a fixed position relative to the body is disclosed.Also disclosed are an apparatus for monitoring aortic blood velocity and derived parameters by Doppler ultrasound and, optionally, ECG comprising such a device and that use of such an apparatus.
    Type: Grant
    Filed: October 4, 1988
    Date of Patent: June 11, 1991
    Assignee: Abbey Biosystems Limited
    Inventors: Peter R. Hall, Jack Trebearne, Dawood Parker, Paul Clancy
  • Motion artefact rejection system for pulse oximeters
    Patent number: 4955379
    Abstract: A pulse oximeter apparatus characterized in that it comprises a bandpass filter adapted selectively to exclude motion artefact from wanted signal is disclosed.Also disclosed is the use of such an apparatus for the determination of pulse rate and/or arterial blood oxygen saturation.
    Type: Grant
    Filed: August 8, 1988
    Date of Patent: September 11, 1990
    Assignee: National Research Development Corporation
    Inventor: Peter R. Hall
  • Aiming systems
    Patent number: 4804843
    Abstract: Aiming system for firearms of the type for use when a target is obscured for example by darkness or camouflage include a sighting arrangement which comprises an imaging device of sufficiently small size to be carried on the firearm. These imaging devices consequently have small apertures and low resolution and are therefore of limited value. The aiming system disclosed herein has an imaging device remote from the firearm which forms a background image of a given field-of-view, the image being displayed on a screen. The system includes a second imaging device carried by the firearm and having a smaller field-of-view corresponding to the line-of-sight of the firearm. The images produced by both imaging devices are correlated by a correlator and a sight-mark is generated in the background image to indicate the line-of-sight of the firearm when correlation is obtained.
    Type: Grant
    Filed: May 7, 1986
    Date of Patent: February 14, 1989
    Assignee: British Aerospace Public Limited Co.
    Inventor: Peter R. Hall