Patents by Inventor Michael Peter Gaukroger
Michael Peter Gaukroger 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).
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Patent number: 9625393Abstract: An apparatus for viewing images of a gemstone is described. The apparatus comprises a support structure for supporting the gemstone at an observation position. An illumination structure comprises a plurality of directional light sources directed towards the observation position so as to illuminate the gemstone. The support structure and illumination structure are relatively rotatable relative to one another about a rotation axis. An imaging device is arranged to obtain images of the gemstone at the observation position at a variety of relative rotational positions between the illumination structure and support structure: the imaging device has an imaging axis passing through the observation position. The support structure is arranged so that the gemstone can be placed at the observation position in such a way that the normal to a selected facet of the gemstone is within a range of tilt angles from the rotation axis.Type: GrantFiled: October 16, 2015Date of Patent: April 18, 2017Assignee: De Beers UK Ltd.Inventors: James Gordon Charters Smith, Michael Peter Gaukroger, Peter Stanley Rose
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Publication number: 20160041106Abstract: An apparatus for viewing images of a gemstone is described. The apparatus comprises a support structure for supporting the gemstone at an observation position. An illumination structure comprises a plurality of directional light sources directed towards the observation position so as to illuminate the gemstone. The support structure and illumination structure are relatively rotatable relative to one another about a rotation axis. An imaging device is arranged to obtain images of the gemstone at the observation position at a variety of relative rotational positions between the illumination structure and support structure: the imaging device has an imaging axis passing through the observation position. The support structure is arranged so that the gemstone can be placed at the observation position in such a way that the normal to a selected facet of the gemstone is within a range of tilt angles from the rotation axis.Type: ApplicationFiled: October 16, 2015Publication date: February 11, 2016Inventors: James Gordon Charters SMITH, Michael Peter GAUKROGER, Peter Stanley ROSE
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Patent number: 9188542Abstract: An apparatus for viewing images of a gemstone is described. The apparatus comprises a support structure for supporting the gemstone at an observation position. An illumination structure comprises a plurality of directional light sources directed towards the observation position so as to illuminate the gemstone. The support structure and illumination structure are relatively rotatable relative to one another about a rotation axis. An imaging device is arranged to obtain images of the gemstone at the observation position at a variety of relative rotational positions between the illumination structure and support structure: the imaging device has an imaging axis passing through the observation position. The support structure is arranged so that the gemstone can be placed at the observation position in such a way that the normal to a selected facet of the gemstone is within a range of tilt angles from the rotation axis.Type: GrantFiled: July 16, 2009Date of Patent: November 17, 2015Assignee: De Beers UK Ltd.Inventors: James Gordon Charters Smith, Michael Peter Gaukroger, Peter Stanley Rose
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Patent number: 9133566Abstract: The invention relates to a single crystal CVD diamond material, wherein the extended defect density as characterized by X-ray topography is less than 400/cm2 over an area of greater than 0.014 cm2. The invention further relates to a method for producing a CVD single crystal diamond material according to any preceding claim comprising the step of selecting a substrate on which to grow the CVD single crystal diamond, wherein the substrate has at least one of a density of extended defects as characterized by X-ray topography of less than 400/cm2 over an area greater than 0.014 cm2; an optical isotropy of less than 1×10-5 over a volume greater than 0.1 mm3; and a FWHM X-ray rocking curve width for the (004) reflection of less than 20 arc seconds.Type: GrantFiled: December 8, 2006Date of Patent: September 15, 2015Assignee: ELEMENT SIX TECHNOLOGIES LIMITEDInventors: Daniel James Twitchen, Grant Charles Summerton, Ian Friel, John Olaf Hansen, Keith Barry Guy, Michael Peter Gaukroger, Philip Maurice Martineau, Robert Charles Burns, Simon Craig Lawson, Timothy Patrick Gerard Addison
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Patent number: 9061263Abstract: This invention relates to a method of improving the crystalline perfection of IIa diamond crystals by heating the grown diamond crystals at an elevated temperature and an elevated pressure. The invention extends to grown diamond material having a low extended defect density with low nitrogen concentration.Type: GrantFiled: December 9, 2005Date of Patent: June 23, 2015Assignee: ELEMENT SIX TECHNOLOGIES LIMITEDInventors: Grant Charles Summerton, John Olaf Hansen, Robert Charles Burns, Timothy Patrick Gerard Addison, Simon Craig Lawson, Keith Barry Guy, Michael Peter Gaukroger
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Publication number: 20110228063Abstract: An apparatus for viewing images of a gemstone is described. The apparatus comprises a support structure for supporting the gemstone at an observation position. An illumination structure comprises a plurality of directional light sources directed towards the observation position so as to illuminate the gemstone. The support structure and illumination structure are relatively rotatable relative to one another about a rotation axis. An imaging device is arranged to obtain images of the gemstone at the observation position at a variety of relative rotational positions between the illumination structure and support structure: the imaging device has an imaging axis passing through the observation position. The support structure is arranged so that the gemstone can be placed at the observation position in such a way that the normal to a selected facet of the gemstone is within a range of tilt angles from the rotation axis.Type: ApplicationFiled: July 16, 2009Publication date: September 22, 2011Applicant: De Beers Centenary AGInventors: James Gordon Charters Smith, Michael Peter Gaukroger, Peter Stanley Rose
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Publication number: 20090258229Abstract: This invention relates to a method of improving the crystalline perfection of IIa diamond crystals by heating the grown diamond crystals at an elevated temperature and an elevated pressure. The invention extends to grown diamond material having a low extended defect density with low nitrogen concentration.Type: ApplicationFiled: December 9, 2005Publication date: October 15, 2009Inventors: Grant Charles Summerton, John Olaf Hansen, Robert Charles Burns, Timothy Patrick Gerard Addison, Simon Craig Lawson, Keith Barry Guy, Michael Peter Gaukroger
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Publication number: 20090127506Abstract: The invention relates to a single crystal CVD diamond material, wherein the extended defect density as characterised by X-ray topography is less than 400/cm2 over an area of greater than 0.014 cm2. The invention further relates to a method for producing a CVD single crystal diamond material according to any preceding claim comprising the step of selecting a substrate on which to grow the CVD single crystal diamond, wherein the substrate has at least one of a density of extended defects as characterised by X-ray topography of less than 400/cm2 over an area greater than 0.014 cm2; an optical isotropy of less than 1×10-5 over a volume greater than 0.1 mm3; and a FWHM X-ray rocking curve width for the (004) reflection of less than 20 arc seconds.Type: ApplicationFiled: December 8, 2006Publication date: May 21, 2009Inventors: Daniel James Twitchen, Grant Charles Summerton, Ian Friel, John Olaf Hansen, Keith Barry Guy, Michael Peter Gaukroger, Philip Maurice Martineau, Robert Charles Burns, Simon Craig Lawson, Timothy Patrick Gerard Addison
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Patent number: 6358427Abstract: An invisible information mark is provided on a facet of a diamond gemstone by applying a plasma resist to the exposed surface of the gemstone, applying an electrically conducting layer of metal to the region where the information mark is to be formed, ablating a selected zone of the metal and resist layers by ultraviolet laser thus forming a mask on the surface of the facet, electrically connecting the metal layer and plasma etching the facet through the mask, thus forming a mark of appropriate depth on the surface of the gemstone.Type: GrantFiled: February 9, 2000Date of Patent: March 19, 2002Assignee: Gersan EstablishmentInventors: James Gordon Charters Smith, Keith Barry Guy, Graham Ralph Powell, Michael Peter Gaukroger