Patents by Inventor Alexander Robertson

Alexander Robertson 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).

  • Publication number: 20140183143
    Abstract: A vibratory separator includes a screen frame having an upper screen surface and a plurality of openings and a first screen insert disposed in a first opening of the plurality of openings of the screen frame, the screen insert having a screen surface positioned at a first height above the supper screen surface. The vibratory separator also includes a second screen insert disposed in a second opening of the plurality of openings of the second screen frame, wherein a screen surface of the second screen insert is positioned at a second height. The second height may be different from the first height. A method of processing fluid includes providing a flow of fluid to a vibratory separator, and flowing the fluid over a screen having a first screen insert positioned at a first height.
    Type: Application
    Filed: December 10, 2013
    Publication date: July 3, 2014
    Applicants: United Wire, Ltd., M-I L.L.C.
    Inventors: Eric Cady, Graham Alexander Robertson, Claire Rosaleen Galloway McLean, LaTosha Moore, Andrew Ralph
  • Patent number: 8596464
    Abstract: A frame over which woven wire mesh is to be stretched and secured to form a sieving screen and which can be used to screen solids from drilling mud recovered from down-hole when drilling for oil or gas. The frame is a rectilinear moulded plastics frame having edge regions by which it is secured in place in a shaker. Within the frame is a plurality of rectilinear windows formed by an orthogonal array of intersecting ribs also of moulded plastics material. Some of the ribs are internally reinforced by rigid metal members which extend orthogonally between hollow box-section members which define a sub-frame for reinforcing the four edge regions of the frame. The orthogonal members are secured at their ends to the sub-frame. The ends of the sub-frame members are joined at the four corners of the sub-frame. In this way not are only the edge regions of the frame reinforced internally but so also are some of the orthogonally intersecting ribs, so as thereby to produce a rigid frame for the screen.
    Type: Grant
    Filed: May 17, 2010
    Date of Patent: December 3, 2013
    Assignee: United Wire Limited
    Inventor: Graham Alexander Robertson
  • Patent number: 7912527
    Abstract: A medical imaging apparatus for imaging subcutaneous body temperature that comprises a detector (22) for sensing millimeter wave electromagnetic radiation and a collector for collecting radiation emitted from a patient's body and directing it along a collection path (20) to the detector. The collector is configured so that the collected radiation has a defined sensitivity profile across and along substantially the entire length of that path. The collected radiation may have a Gaussian or a Bessel sensitivity profile.
    Type: Grant
    Filed: March 26, 2003
    Date of Patent: March 22, 2011
    Assignee: The University Court of the University of St. Andrews
    Inventors: Duncan Alexander Robertson, David Graham MacFarlane, James Christopher George Lesurf
  • Patent number: 7819254
    Abstract: A frame over which woven wire mesh is to be stretched and secured to form a sieving screen and which can be used to screen solids from drilling mud recovered from down-hole when drilling for oil or gas. The frame is a rectilinear moulded plastics frame having edge regions by which it is secured in place in a shaker. Within the frame is a plurality of rectilinear windows formed by an orthogonal array of intersecting ribs also of moulded plastics material. Some of the ribs are internally reinforced by rigid metal members which extend orthogonally between hollow box-section members which define a sub-frame for reinforcing the four edge regions of the frame. The orthogonal members are secured at their ends to the sub-frame. The ends of the sub-frame members are joined at the four corners of the sub-frame. In this way not are only the edge regions of the frame reinforced internally but so also are some of the orthogonally intersecting ribs, so as thereby to produce a rigid frame for the screen.
    Type: Grant
    Filed: December 14, 2005
    Date of Patent: October 26, 2010
    Assignee: United Wire Limited
    Inventor: Graham Alexander Robertson
  • Patent number: 7810649
    Abstract: A frame over which woven wire mesh is to be stretched and secured to form a sieving screen and which can be used to screen solids from drilling mud recovered from down-hole when drilling for oil or gas. The frame comprises a rectilinear molded plastics frame having edge regions by which it is secured in place in a shaker. Within the frame is a plurality of rectilinear windows formed by an orthogonal array of intersecting ribs also of molded plastics material. Some of the ribs are internally reinforced by a structure comprising two spaced apart layers of orthogonal intersecting spaced apart wires, running parallel to the length and breadth of the rectilinear shape of the frame within the ribs to increase their rigidity. The edge regions of the frame are reinforced internally by metal box-section members joined at their four corners and defining perimeter reinforcement, and the ends of the wires are secured to the box-section members.
    Type: Grant
    Filed: December 14, 2005
    Date of Patent: October 12, 2010
    Assignee: United Wire Limited
    Inventor: Graham Alexander Robertson
  • Publication number: 20100219110
    Abstract: A frame over which woven wire mesh is to be stretched and secured to form a sieving screen and which can be used to screen solids from drilling mud recovered from down-hole when drilling for oil or gas. The frame is a rectilinear moulded plastics frame having edge regions by which it is secured in place in a shaker. Within the frame is a plurality of rectilinear windows formed by an orthogonal array of intersecting ribs also of moulded plastics material. Some of the ribs are internally reinforced by rigid metal members which extend orthogonally between hollow box-section members which define a sub-frame for reinforcing the four edge regions of the frame. The orthogonal members are secured at their ends to the sub-frame. The ends of the sub-frame members are joined at the four corners of the sub-frame. In this way not are only the edge regions of the frame reinforced internally but so also are some of the orthogonally intersecting ribs, so as thereby to produce a rigid frame for the screen.
    Type: Application
    Filed: May 17, 2010
    Publication date: September 2, 2010
    Applicant: UNITED WIRE LIMITED
    Inventor: Graham Alexander Robertson
  • Publication number: 20090139909
    Abstract: A frame over which woven wire mesh is to be stretched and secured to form a sieving screen and which can be used to screen solids from drilling mud recovered from down-hole when drilling for oil or gas. The frame comprises a rectilinear moulded plastics frame having edge regions by which it is secured in place in a shaker. Within the frame is a plurality of rectilinear windows formed by an orthogonal array of intersecting ribs also of moulded plastics material. Some of the ribs are internally reinforced by a structure comprising two spaced apart layers of orthogonal intersecting spaced apart wires, running parallel to the length and breadth of the rectilinear shape of the frame within the ribs to increase their rigidity. The edge regions of the frame are reinforced internally by metal box-section members joined at their four corners and defining perimeter reinforcement, and the ends of the wires are secured to the box-section members.
    Type: Application
    Filed: December 14, 2005
    Publication date: June 4, 2009
    Inventor: Graham Alexander Robertson
  • Publication number: 20070087828
    Abstract: Computer system for creating and playing location aware games. The creation process allows for authoring of custom location aware games, training aids, tours and scavenger hunts using a mobile computing device and map. The resulting game can be played using a mobile computing device and location receiver (e.g. GPS receiver).
    Type: Application
    Filed: October 14, 2005
    Publication date: April 19, 2007
    Inventor: Alexander Robertson
  • Publication number: 20050045194
    Abstract: A cigarette extinguishing device including a body having a generally flat bottom surface, a top surface, and a frustoconical bore extending between the top and bottom surfaces, and an interest feature on the exterior of the body, where the bore is sufficiently long to support a cigarette which is axially inserted therein.
    Type: Application
    Filed: August 29, 2003
    Publication date: March 3, 2005
    Applicant: Adams Apple Distibuting L.P.
    Inventor: Alexander Robertson
  • Patent number: 6828166
    Abstract: A low threshold distributed feedback (DFB) laser is constructed for improved performance at subzero temperatures. A loss grating is employed to enhance the probability that lasing occurs near the short wavelength side of the stopband and to counteract the effect of negative gain tilt that occurs when DFB lasers are positively detuned. A method of making DFB lasers from wafers with improved yield for low temperature side mode suppression ratio (SMSR) is also disclosed.
    Type: Grant
    Filed: September 6, 2002
    Date of Patent: December 7, 2004
    Assignee: Agere Systems, Inc.
    Inventors: Lars E. Eng, Ram Jambunathan, Kishore K. Kamath, Alexander Robertson, Daniel Paul Wilt
  • Publication number: 20030002557
    Abstract: A low threshold distributed feedback (DFB) laser is constructed for improved performance at subzero temperatures. A loss grating is employed to enhance the probability that lasing occurs near the short wavelength side of the stopband and to counteract the effect of negative gain tilt that occurs when DFB lasers are positively detuned. A method of making DFB lasers from wafers with improved yield for low temperature side mode suppression ratio (SMSR) is also disclosed.
    Type: Application
    Filed: September 6, 2002
    Publication date: January 2, 2003
    Inventors: Lars E. Eng, Ram Jambunathan, Kishore K. Kamath, Alexander Robertson, Daniel Paul Wilt
  • Patent number: 6477194
    Abstract: A low threshold distributed feedback (DFB) laser is constructed for improved performance at subzero temperatures. A loss grating is employed to enhance the probability that lasing occurs near the short wavelength side of the stopband and to counteract the effect of negative gain tilt that occurs when DFB lasers are positively detuned. A method of making DFB lasers from wafers with improved yield for low temperature side mode suppression ratio (SMSR) is also disclosed.
    Type: Grant
    Filed: November 15, 1999
    Date of Patent: November 5, 2002
    Assignee: Agere Systems Guardian Corp.
    Inventors: Lars E. Eng, Ram Jambunathan, Kishore K. Kamath, Alexander Robertson, Daniel Paul Wilt
  • Patent number: 4117825
    Abstract: A cooking stand and cooking stand assembly are provided which can be readily assembled and dismounted for use indoors or outdoors; the stand comprises an upstanding supporting frame including at least one pair of retaining bars including an upper bar and a lower bar defining a slot therebetween; and a support member having an upper cooking surface and including at least a pair of spaced apart retaining arms extending from one side of the support member and adapted to removably sit in the slot, whereby the support member is held in the frame to dispose the cooking surface horizontally.
    Type: Grant
    Filed: May 26, 1976
    Date of Patent: October 3, 1978
    Inventor: Thomas Alexander Robertson
  • Patent number: 4066807
    Abstract: In the marking of metal, for example, steel billets, by spraying aluminum through a stencil, the sprayed metal tends to build up on the stencil and render it inoperative. To reduce the metal build-up, a release compound is applied to the stencil surface and the surface is cleaned periodically during use. The release compound can be sprayed-on and cleaning can be effected by a rotary brush, both movable with the metal spray nozzle.
    Type: Grant
    Filed: February 17, 1976
    Date of Patent: January 3, 1978
    Assignee: Hilti Aktiengesellschaft
    Inventor: Alexander Robertson Craig
  • Patent number: 4046044
    Abstract: A paper trimmer is described comprising a base board and a fixed blade set in one edge of the board, the improvement comprising a guide rail mounted above and closely spaced from the cutter blade and a carriage mounted on the guide rail, the carriage containing a cutter wheel abutting the fixed blade and adapted to be turned, as the carriage is slid on the guide, by engagement of a friction drive wheel coaxial with the cutter wheel on the upper surface of the guide rail.
    Type: Grant
    Filed: November 20, 1975
    Date of Patent: September 6, 1977
    Inventors: Donald MacDougal Paterson, deceased, by Alexander Robertson Brackenridge, executor
  • Patent number: 3943853
    Abstract: A blasting mat made up of arcuate vehicle tire members arranged in hinged together groups. The mat has rigid joining means along its sides permitting the mat to be hingedly joined side-by-side with other mats to form a larger protective cover. The mat has means for protecting the joining means from damage during blasting.
    Type: Grant
    Filed: March 4, 1974
    Date of Patent: March 16, 1976
    Inventors: Thomas Alexander Robertson, John Alfred King
  • Patent number: RE45746
    Abstract: A method of forming a shaker screen includes forming a frame, and attaching a first sealing element to at least one side of an outer perimeter of the frame, wherein the attaching comprises aligning a first mating surface of the frame to a second mating surface of the first sealing element, and wherein the first mating surface of the frame includes an extension, and the second mating surface of the first sealing element includes a groove configured to align with the extension. A system of sealing shaker screens includes a first screen and a second screen disposed adjacent the first screen, wherein a first sealing element of a first frame and a portion of the second screen interact to provide a seal between the first screen and the second screen.
    Type: Grant
    Filed: December 6, 2013
    Date of Patent: October 13, 2015
    Assignees: M-I L.L.C., United Wire Limited
    Inventors: Brian S. Carr, Graham Alexander Robertson, Eric Cady