Patents by Inventor Lawrence W. Engdahl

Lawrence W. Engdahl 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: 5499856
    Abstract: A foldable front-entry safety walker is disclosed having a resistance to backward motion of the walker. Various embodiments of the walker are disclosed. The walker includes a pair of side frames, along with a corresponding pair of front legs and a pair of rear legs. A foldable seat is disposed at the rear portion of the walker. The walker is relatively lightweight allowing a person with limited walking ability to easily advance the walker forward. The rear legs may have spring-loaded brakes that are functional to prevent backward motion of the walker under certain conditions. If the user falls backward for whatever reason, the user will strike either the seat back or the seat cushion and the force of the falling body will activate a spring-loaded rear legs to prevent backward motion of the walker.
    Type: Grant
    Filed: June 13, 1994
    Date of Patent: March 19, 1996
    Assignee: Sorrell Medical, Incorporated
    Inventors: Michael R. Sorrell, Lawrence W. Engdahl, Simon Slootsky
  • Patent number: 5270549
    Abstract: An annular cylindrical multihole collimator for a radioisotope camera made by forming a plurality of closed annular radio-opaque plates which may be all corrugated plates or may be half corrugated and half flat, each having at least one collimator segment section and junction, and stacking a number of said plates cylindrically, axially on one another, alternately if both flat and corrugated plates are used, to form an annular cylindrical multihole collimator with at least one segment, each plate being bonded to its adjacent plates.
    Type: Grant
    Filed: June 8, 1992
    Date of Patent: December 14, 1993
    Assignee: Digital Scintigraphics, Inc.
    Inventor: Lawrence W. Engdahl
  • Patent number: 5070875
    Abstract: A tonometer divides internally incident light at the applanating surface of a prism so that light incident in the applanation area is refracted into the eye and light incident around the applanation area is internally reflected within the prism. Infrared light is preferred for this, and the amount of the reflected light is detected to provide an objective indication of the size of the area that is applanated. This allows intraocular pressure to be determined objectively from the force difference applied to the prism to change the applanation area between reference and measurement sizes, both of which are reliably determined from previous calibration for the amount of the reflected light. Many variations are possible in applying a variable force to the applanating prism and on operating the instrument with the preferred microprocessor, which can also store, display, and manipulate relevant patient data.
    Type: Grant
    Filed: November 19, 1990
    Date of Patent: December 10, 1991
    Assignee: Falcken, Inc.
    Inventors: Francis Y. Falck, Robert W. Falck, Lawrence W. Engdahl
  • Patent number: 4962780
    Abstract: A sunshield device is disclosed having two relatively movable, collapsible screen means fabricated of material which upon relative motion between screen means operates to filter, block, scatter and reduce the intensity of solar radiation. The desired effect is achieved by using polarizing film, imprinting patterns of opaque and have parent strips or dots so that upon rotation, translation or orbital motion of one screen means relative to another screen means virtually any desired intensity of solar radiation can be achieved including a complete solar block.
    Type: Grant
    Filed: February 6, 1989
    Date of Patent: October 16, 1990
    Assignee: Stenmisk, Incorporated
    Inventors: Lawrence W. Engdahl, Howard E. Stein
  • Patent number: 4942271
    Abstract: A duct assembly for enclosing conduits, cables, wires, lines and the like, comprising a base having a generally U-shaped cross section along its longitudinal axis, and a cover having a generally U-shaped cross section along its longitudinal axis. The base includes a generally planar central portion with first and second legs extending substantially perpendicular thereto. The cover includes an intermediate portion having third and fourth legs extending substantially perpendicular thereto. The cover is pivotally and releasably coupled to the base at one end and releasably coupled to the base at the other end. The pivotal and releasable coupling is made up and released via a snap fit resulting from forces exerted substantially perpendicular to the longitudinal axes of the cover and the base. The pivotal coupling allows angular movement of the cover relative to the base through about to about
    Type: Grant
    Filed: December 7, 1988
    Date of Patent: July 17, 1990
    Assignee: Hubbell Incorporated
    Inventors: Paul J. Corsi, Lawrence W. Engdahl, Daniel E. Klas
  • Patent number: 4280051
    Abstract: An apparatus for mounting a scintillation crystal in a detector assembly of a gamma imaging device. The mounting apparatus effectively isolates forces applied by a spring biased array of phototubes from a frangible scintillation crystal. The crystal is separately biased to the light pipe using only the minimum force needed to insure good optical coupling.
    Type: Grant
    Filed: October 4, 1978
    Date of Patent: July 21, 1981
    Assignee: Picker Corporation
    Inventors: Lawrence W. Engdahl, Allan J. Deans
  • Patent number: 4012636
    Abstract: A scanning system for a gamma camera providing for the overlapping of adjacent scan paths. A collimator mask having tapered edges provides for a graduated reduction in intensity of radiation received by a detector thereof, the reduction in intensity being graduated in a direction normal to the scanning path to provide a blending of images of adjacent scan paths.
    Type: Grant
    Filed: September 8, 1975
    Date of Patent: March 15, 1977
    Assignee: Raytheon Company
    Inventors: Lawrence W. Engdahl, John F. Batter, Jr., Karl J. Stout