Patents by Inventor Yuemei Yang
Yuemei Yang 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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Publication number: 20230069726Abstract: The present disclosure discloses a grating spectrometer having a V-shaped projection light path and capable of eliminating coma aberration. The grating spectrometer includes an entrance slit S1, a grating G, an entrance spherical reflector M1, a focusing spherical reflector M2, and an exit slit S2 which are arranged on a light path in sequence in a light transmission direction. The entrance slit S1 and the exit slit S2 are respectively arranged on two sides of the grating G, and a coaxial entrance light path formed by the entrance slit S1 and the entrance spherical reflector M1 and a coaxial diffraction light path formed by the grating G and the focusing spherical reflector M2 form a V-shaped structure by projection in a diffraction plane. The grating spectrometer has actual population and application value.Type: ApplicationFiled: March 31, 2022Publication date: March 2, 2023Inventors: Liangyao Chen, Yuxiang Zheng, Haibin Zhao, Rongjun Zhang, Songyou Wang, Jianke Chen, Anqing Jiang, Yuemei Yang
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Patent number: 11293803Abstract: The present invention discloses a coma-elimination broadband high-resolution spectrograph, comprising incident slits, a collimating mirror, an integrated grating, a two-dimensional focus imaging mirror and a two-dimensional area array detector, wherein the incident slits enters along the incident slits, passes through a light through hole in the center of the integrated grating and is incident to the collimating mirror, the incident light enters the integrated grating along a coaxial optical path L1 after collimation of the collimating mirror and is focused by the two-dimensional focus imaging mirror after diffraction of each sub-grating, diffraction light in full spectrum region enters a focal plane of the two-dimensional area array detector for detection along an coaxial optical path L2, and off-axis angles of the L1 and the L2 are zero.Type: GrantFiled: July 20, 2020Date of Patent: April 5, 2022Inventors: Liangyao Chen, Songyou Wang, Haibin Zhao, Yuxiang Zheng, Rongjun Zhang, Yuemei Yang, Jianke Chen, Anqing Jiang
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Patent number: 11268853Abstract: The present invention discloses a multichannel broadband high-resolution spectrograph, comprising a plurality of light source incident slits, a multichannel integrated grating, a multichannel shared two-dimensional focus imaging mirror and a two-dimensional area array detector which are sequentially disposed along a light source incident or reflection line, wherein the multichannel integrated grating consists of a plurality of sub-gratings, incident light enters the corresponding integrated gratings along the light source incident slits and then is focused by the shared two-dimensional focus imaging mirror after diffraction of the integrated grating, and diffraction light in a full-spectrum region is incident onto a focal plane of the two-dimensional area array detector for detection. No any mechanical displacement part is disposed, multichannel, full-spectrum and high-speed detection and analysis is achieved, and the present disclosure has high spectrum resolution and working reliability.Type: GrantFiled: July 20, 2020Date of Patent: March 8, 2022Inventors: Liangyao Chen, Songyou Wang, Haibin Zhao, Yuxiang Zheng, Rongjun Zhang, Yuemei Yang, Jianke Chen, Anqing Jiang
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Publication number: 20200348174Abstract: The present invention discloses a coma-elimination broadband high-resolution spectrograph, comprising incident slits, a collimating mirror, an integrated grating, a two-dimensional focus imaging mirror and a two-dimensional area array detector, wherein the incident slits enters along the incident slits, passes through a light through hole in the center of the integrated grating and is incident to the collimating mirror, the incident light enters the integrated grating along a coaxial optical path L1 after collimation of the collimating mirror and is focused by the two-dimensional focus imaging mirror after diffraction of each sub-grating, diffraction light in full spectrum region enters a focal plane of the two-dimensional area array detector for detection along an coaxial optical path L2, and off-axis angles of the L1 and the L2 are zero.Type: ApplicationFiled: July 20, 2020Publication date: November 5, 2020Inventors: Liangyao Chen, Songyou Wang, Haibin Zhao, Yuxiang Zheng, Rongjun Zhang, Yuemei Yang, Jianke Chen, Anqing Jiang
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Publication number: 20200348172Abstract: The present invention discloses a multichannel broadband high-resolution spectrograph, comprising a plurality of light source incident slits, a multichannel integrated grating, a multichannel shared two-dimensional focus imaging mirror and a two-dimensional area array detector which are sequentially disposed along a light source incident or reflection line, wherein the multichannel integrated grating consists of a plurality of sub-gratings, incident light enters the corresponding integrated gratings along the light source incident slits and then is focused by the shared two-dimensional focus imaging mirror after diffraction of the integrated grating, and diffraction light in a full-spectrum region is incident onto a focal plane of the two-dimensional area array detector for detection. No any mechanical displacement part is disposed, multichannel, full-spectrum and high-speed detection and analysis is achieved, and the present disclosure has high spectrum resolution and working reliability.Type: ApplicationFiled: July 20, 2020Publication date: November 5, 2020Inventors: Liangyao Chen, Songyou Wang, Haibin Zhao, Yuxiang Zheng, Rongjun Zhang, Yuemei Yang, Jianke Chen, Anqing Jiang
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Patent number: 7811542Abstract: A method for making carbon nanotube particulates involves providing a catalyst comprising catalytic metals, such as iron and molybdenum or metals from Group VIB or Group VIIIB elements, on a support material, such as magnesia, and contacting the catalyst with a gaseous carbon-containing feedstock, such as methane, at a sufficient temperature and for a sufficient contact time to make small-diameter carbon nanotubes having one or more walls and outer wall diameters of less than about 3 nm. Removal of the support material from the carbon nanotubes yields particulates of enmeshed carbon nanotubes that retain an approximate three-dimensional shape and size of the particulate support that was removed. The carbon nanotube particulates can comprise ropes of carbon nanotubes. The carbon nanotube particulates disperse well in polymers and show high conductivity in polymers at low loadings. As electrical emitters, the carbon nanotube particulates exhibit very low “turn on” emission field.Type: GrantFiled: September 14, 2006Date of Patent: October 12, 2010Assignee: Unidym, Inc.Inventors: Kenneth O. McElrath, Yuemei Yang, Kenneth A. Smith, Xiaodong Hu
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Publication number: 20100254886Abstract: A method for making carbon nanotube particulates involves providing a catalyst comprising catalytic metals, such as iron and molybdenum or metals from Group VIB or Group VIIIB elements, on a support material, such as magnesia, and contacting the catalyst with a gaseous carbon-containing feedstock, such as methane, at a sufficient temperature and for a sufficient contact time to make small-diameter carbon nanotubes having one or more walls and outer wall diameters of less than about 3 nm. Removal of the support material from the carbon nanotubes yields particulates of enmeshed carbon nanotubes that retain an approximate three-dimensional shape and size of the particulate support that was removed. The carbon nanotube particulates can comprise ropes of carbon nanotubes. The carbon nanotube particulates disperse well in polymers and show high conductivity in polymers at low loadings. As electrical emitters, the carbon nanotube particulates exhibit very low “turn on” emission field.Type: ApplicationFiled: September 14, 2006Publication date: October 7, 2010Inventors: Kenneth O. McElrath, Yuemei Yang, Kenneth A. Smith, Xiaodong Hu
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Patent number: 7566434Abstract: A method for separating single-wall carbon nanotubes from an aqueous slurry comprises adding a water-immiscible organic solvent to an aqueous slurry comprising single-wall carbon nanotubes, isolating at least some of the single-wall carbon nanotubes in the solvent, and removing the solvent from the single-wall carbon nanotubes to form dried single-wall carbon nanotubes. A spheroidal aggregate of single-wall carbon nanotubes is formed wherein the aggregate is approximately spherical and has a diameter in a range of about 0.1 and about 5 mm, and wherein the aggregate contains at least about 80 wt % single-wall carbon nanotubes. The spheroidal aggregates of single-wall carbon nanotubes are easily handled in industrial processes and are redispersable to single-wall carbon nanotubes and/or ropes of single-wall carbon nanotubes. This invention can also be applied to multi-wall carbon nanotubes.Type: GrantFiled: September 20, 2006Date of Patent: July 28, 2009Assignee: Unidym, Inc.Inventors: Yuemei Yang, Martin Grosboll, Eduardo Vega, Jr.
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Publication number: 20090175778Abstract: A method for separating single-wall carbon nanotubes from an aqueous slurry comprises adding a water-immiscible organic solvent to an aqueous slurry comprising single-wall carbon nanotubes, isolating at least some of the single-wall carbon nanotubes in the solvent, and removing the solvent from the single-wall carbon nanotubes to form dried single-wall carbon nanotubes. A spheroidal aggregate of single-wall carbon nanotubes is formed wherein the aggregate is approximately spherical and has a diameter in a range of about 0.1 and about 5 mm, and wherein the aggregate contains at least about 80 wt % single-wall carbon nanotubes. The spheroidal aggregates of single-wall carbon nanotubes are easily handled in industrial processes and are redispersable to single-wall carbon nanotubes and/or ropes of single-wall carbon nanotubes. This invention can also be applied to multi-wall carbon nanotubes.Type: ApplicationFiled: September 20, 2006Publication date: July 9, 2009Inventors: Yuemei Yang, Martin Grosboll, Eduardo Vega, JR.
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Patent number: 7488875Abstract: A carbon nanotube material that comprises carbon nanotubes, a magnesia support and a catalyst metal can be purified by contacting it with a mixture comprising carbon dioxide and water. At least some of the magnesia support is reacted to form water-soluble compounds.Type: GrantFiled: December 3, 2004Date of Patent: February 10, 2009Assignee: Unidym, Inc.Inventors: Jeffrey L. Bahr, Yuemei Yang, Kenneth O. McElrath, Martin P. Grosboll, Aurelie Mayeux
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Patent number: 7250148Abstract: A method for growing single-wall carbon nanotubes involves preparing a catalyst comprising catalytic metals, iron and molybdenum, and magnesium oxide support material and contacting the catalyst with a gaseous carbon-containing feedstock at a sufficient temperature and for a sufficient contact time to make single-wall carbon nanotubes. The weight ratio of iron and molybdenum can range from about 2 to 1 to about 10 to 1 and the metals loading up to about 10 wt % of the MgO. The catalyst can be sulfided. Methane is a suitable carbon-containing feedstock. The process can be conducted in batch, continuous or semi-continuous modes, in reactors, such as a transport reactor, fluidized bed reactor, moving bed reactors and combinations thereof. The process also includes making single-wall carbon nanotubes with catalysts comprising at least one Group VIB or Group VIIIB metal on supports such as magnesia, zirconia, silica, and alumina, where the catalyst is sulfided.Type: GrantFiled: July 30, 2003Date of Patent: July 31, 2007Assignee: Carbon NanoTechnologies, Inc.Inventors: Yuemei Yang, Martin P. Grosboll, Kenneth A. Smith
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Patent number: 7135160Abstract: A method for separating single-wall carbon nanotubes from an aqueous slurry comprises adding a water-immiscible organic solvent to an aqueous slurry comprising single-wall carbon nanotubes, isolating at least some of the single-wall carbon nanotubes in the solvent, and removing the solvent from the single-wall carbon nanotubes to form dried single-wall carbon nanotubes. A spheroidal aggregate of single-wall carbon nanotubes is formed wherein the aggregate is approximately spherical and has a diameter in a range of about 0.1 and about 5 mm, and wherein the aggregate contains at least about 80 wt % single-wall carbon nanotubes. The spheroidal aggregates of single-wall carbon nanotubes are easily handled in industrial processes and are redispersable to single-wall carbon nanotubes and/or ropes of single-wall carbon nanotubes. This invention can also be applied to multi-wall carbon nanotubes.Type: GrantFiled: April 1, 2003Date of Patent: November 14, 2006Assignee: Carbon NanoTechnologies, Inc.Inventors: Yuemei Yang, Martin Grosboll, Eduardo Vega, Jr.
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Patent number: 7090819Abstract: The present invention relates to an all gas-phase process for the purification of single-wall carbon nanotubes and the purified single-wall carbon nanotube material. Known methods of single-wall carbon nanotube production result in a single-wall carbon nanotube product that contains single-wall carbon nanotubes in addition to impurities including residual metal catalyst particles and amounts of small amorphous carbon sheets that surround the catalyst particles and appear on the sides of the single-wall carbon nanotubes and “ropes” of single-wall carbon nanotubes. The purification process removes the extraneous carbon as well as metal-containing residual catalyst particles. The process comprises oxidation of the single-wall carbon nanotube material, reduction and reaction of a halogen-containing gas with the metal-containing species. The oxidation step may be done dry or in the presence of water vapor.Type: GrantFiled: February 8, 2002Date of Patent: August 15, 2006Assignee: William Marsh Rice UniversityInventors: Richard E. Smalley, Robert H. Hauge, Wan-Ting Chiang, Yuemei Yang, Kenneth A. Smith, Wilber Carter Kittrell, Zhenning Gu
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Publication number: 20060062718Abstract: A carbon nanotube material that comprises carbon nanotubes, a magnesia support and a catalyst metal can be purified by contacting it with a mixture comprising carbon dioxide and water. At least some of the magnesia support is reacted to form water-soluble compounds.Type: ApplicationFiled: December 3, 2004Publication date: March 23, 2006Inventors: Jeffrey Bahr, Yuemei Yang, Kenneth McElrath, Martin Grosboll, Aurelie Mayeux
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Publication number: 20050074392Abstract: A method for growing single-wall carbon nanotubes involves preparing a catalyst comprising catalytic metals, iron and molybdenum, and magnesium oxide support material and contacting the catalyst with a gaseous carbon-containing feedstock at a sufficient temperature and for a sufficient contact time to make single-wall carbon nanotubes. The weight ratio of iron and molybdenum can range from about 2 to 1 to about 10 to 1 and the metals loading up to about 10 wt % of the MgO. The catalyst can be sulfided. Methane is a suitable carbon-containing feedstock. The process can be conducted in batch, continuous or semi-continuous modes, in reactors, such as a transport reactor, fluidized bed reactor, moving bed reactors and combinations thereof. The process also includes making single-wall carbon nanotubes with catalysts comprising at least one Group VIB or Group VIIIB metal on supports such as magnesia, zirconia, silica, and alumina, where the catalyst is sulfided.Type: ApplicationFiled: July 30, 2003Publication date: April 7, 2005Inventors: Yuemei Yang, Martin Grosboll, Kenneth Smith
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Publication number: 20050002851Abstract: A method for making carbon nanotube particulates involves providing a catalyst comprising catalytic metals, such as iron and molybdenum or metals from Group VIB or Group VIIIB elements, on a support material, such as magnesia, and contacting the catalyst with a gaseous carbon-containing feedstock, such as methane, at a sufficient temperature and for a sufficient contact time to make small-diameter carbon nanotubes having one or more walls and outer wall diameters of less than about 3 nm. Removal of the support material from the carbon nanotubes yields particulates of enmeshed carbon nanotubes that retain an approximate three-dimensional shape and size of the particulate support that was removed. The carbon nanotube particulates can comprise ropes of carbon nanotubes. The carbon nanotube particulates disperse well in polymers and show high conductivity in polymers at low loadings. As electrical emitters, the carbon nanotube particulates exhibit very low “turn on” emission field.Type: ApplicationFiled: November 21, 2003Publication date: January 6, 2005Inventors: Kenneth McElrath, Yuemei Yang, Kenneth Smith, Xiaodong Hu
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Publication number: 20040150312Abstract: A carbon nanotube electron emitter comprises carbon nanotube particulates on a surface, wherein the carbon nanotube particulates comprise entangled small-diameter carbon nanotubes having one, two, three or four walls and having an outer wall diameter in the range of about 0.5 nm and about 3 nm. The carbon nanotube particulate electron emitter has a cross-sectional dimensional in a range of about 0.1 micron and about 100 microns, preferably about 0.1 micron to about 3 microns. The carbon nanotube particulate electron emitters can comprise ropes of carbon nanotubes. The carbon nanotube particulates are easily dispersed in polymers and other media. The carbon nanotube particulates can be dispersed in a viscous media and applied to a surface by various means. The carbon nanotube particulate electron emitter exhibits very low “turn-on” emission field and can be used in a variety of field emission devices.Type: ApplicationFiled: November 21, 2003Publication date: August 5, 2004Inventors: Kenneth O. McElrath, Yuemei Yang, Kenneth A. Smith
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Publication number: 20030224114Abstract: A catalyst suitable for making carbon nanotubes is formed by depositing a transition-metal compound on an aerogel support to form a supported catalyst, calcining the supported catalyst, and activating the catalyst by reducing the transition-metal compound on the support. The transition-metal compound can comprise, for example, at least one element from Group VIII-B or Group VI-B, such as iron, cobalt or a combination thereof. The aerogel can comprise, for example, a material selected from the group consisting of alumina, magnesia, alumina/silica, silica and combinations thereof.Type: ApplicationFiled: February 27, 2003Publication date: December 4, 2003Inventor: Yuemei Yang
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Publication number: 20030215380Abstract: A method for separating single-wall carbon nanotubes from an aqueous slurry comprises adding a water-immiscible organic solvent to an aqueous slurry comprising single-wall carbon nanotubes, isolating at least some of the single-wall carbon nanotubes in the solvent, and removing the solvent from the single-wall carbon nanotubes to form dried single-wall carbon nanotubes. A spheroidal aggregate of single-wall carbon nanotubes is formed wherein the aggregate is approximately spherical and has a diameter in a range of about 0.1 and about 5 mm, and wherein the aggregate contains at least about 80 wt % single-wall carbon nanotubes. The spheroidal aggregates of single-wall carbon nanotubes are easily handled in industrial processes and are redispersable to single-wall carbon nanotubes and/or ropes of single-wall carbon nanotubes. This invention can also be applied to multi-wall carbon nanotubes.Type: ApplicationFiled: April 1, 2003Publication date: November 20, 2003Inventors: Yuemei Yang, Martin Grosboll, Eduardo Vega
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Publication number: 20020159944Abstract: The present invention relates to an all gas-phase process for the purification of single-wall carbon nanotubes and the purified single-wall carbon nanotube material. Known methods of single-wall carbon nanotube production result in a single-wall carbon nanotube product that contains single-wall carbon nanotubes in addition to impurities including residual metal catalyst particles and amounts of small amorphous carbon sheets that surround the catalyst particles and appear on the sides of the single-wall carbon nanotubes and “ropes” of single-wall carbon nanotubes. The purification process removes the extraneous carbon as well as metal-containing residual catalyst particles. The process comprises oxidation of the single-wall carbon nanotube material, reduction and reaction of a halogen-containing gas with the metal-containing species. The oxidation step may be done dry or in the presence of water vapor.Type: ApplicationFiled: February 8, 2002Publication date: October 31, 2002Applicant: William Marsh Rice UniversityInventors: Richard E. Smalley, Robert H. Hauge, Wan-Ting Chiang, Yuemei Yang, Kenneth A. Smith, Wilbur Carter Kittrell, Zhenning Gu