Patents by Inventor QunQing Li

QunQing Li 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: 7754182
    Abstract: A method for forming a carbon nanotube array includes the following steps: providing a smooth substrate (11); depositing a metal catalyst layer (21) on a surface of the substrate; heating the treated substrate to a predetermined temperature in flowing protective gas; and introducing a mixture of carbon source gas and protective gas for 5-30 minutes, thus forming a carbon nanotube array (61) extending from the substrate. When the mixture of carbon source gas and protective gas is introduced, a temperature differential greater than 50° C. between the catalyst and its surrounding environment is created by adjusting a flow rate of the carbon source gas. Further, a partial pressure of the carbon source gas is maintained lower than 20%, by adjusting a ratio of the flow rates of the carbon source gas and the protective gas. The carbon nanotubes formed in the carbon nanotube array are well bundled.
    Type: Grant
    Filed: December 31, 2002
    Date of Patent: July 13, 2010
    Assignees: Beijing FUNATE Innovation Technology Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventors: KaiLi Jiang, ShouShan Fan, QunQing Li
  • Patent number: 7321188
    Abstract: A light filament (206) formed from carbon nanotubes is characterized by high mechanical strength and durability at elevated temperatures, a high surface area to volume ratio, and high emissivity. Additionally, electrical resistance of the light filament does not increase with increasing temperature as much as electrical resistance of conventional metallic light filaments. Accordingly, power consumption of the light filament is low at incandescent operating temperatures.
    Type: Grant
    Filed: October 21, 2005
    Date of Patent: January 22, 2008
    Assignees: Tsing Hua University, Hon Hai Precision Industry Co., Ltd.
    Inventors: KaiLi Jiang, ShouShan Fan, QunQing Li
  • Publication number: 20070228920
    Abstract: A light filament (206) formed from carbon nanotubes is characterized by high mechanical strength and durability at elevated temperatures, a high surface area to volume ratio, and high emissivity. Additionally, electrical resistance of the light filament does not increase with increasing temperature as much as electrical resistance of conventional metallic light filaments. Accordingly, power consumption of the light filament is low at incandescent operating temperatures.
    Type: Application
    Filed: October 21, 2005
    Publication date: October 4, 2007
    Inventors: KaiLi Jiang, ShouShan Fan, QunQing Li
  • Patent number: 7045108
    Abstract: A method of fabricating a long carbon nanotube yarn includes the following steps: (1) providing a flat and smooth substrate; (2) depositing a catalyst on the substrate; (3) positioning the substrate with the catalyst in a furnace; (4) heating the furnace to a predetermined temperature; (5) supplying a mixture of carbon containing gas and protecting gas into the furnace; (6) controlling a difference between the local temperature of the catalyst and the furnace temperature to be at least 50° C.; (7) controlling the partial pressure of the carbon containing gas to be less than 0.2; (8) growing a number of carbon nanotubes on the substrate such that a carbon nanotube array is formed on the substrate; and (9) drawing out a bundle of carbon nanotubes from the carbon nanotube array such that a carbon nanotube yarn is formed.
    Type: Grant
    Filed: December 31, 2002
    Date of Patent: May 16, 2006
    Assignees: Tsinghua University, Hon Hai Precision Ind. Co., Ltd.
    Inventors: KaiLi Jiang, Shoushan Fan, QunQing Li
  • Patent number: 6957993
    Abstract: A light filament (206) formed from carbon nanotubes is characterized by high mechanical strength and durability at elevated temperatures, a high surface area to volume ratio, and high emissivity. Additionally, electrical resistance of the light filament does not increase with increasing temperature as much as electrical resistance of metallic light filaments. Accordingly, power consumption of the light filament is low at incandescent operating temperatures. A method for making a light filament made of carbon nanotubes includes the steps of: forming an array of carbon nanotubes (20); pulling out carbon nanotube yarn (204) from the carbon nanotube array; and winding the yarn between two leads (30) functioning as electrodes to form the light filament.
    Type: Grant
    Filed: December 31, 2002
    Date of Patent: October 25, 2005
    Assignees: Tsinghua University, Hon Hai Precision Ind. Co., Ltd.
    Inventors: KaiLi Jiang, ShouShan Fan, QunQing Li
  • Patent number: 6956698
    Abstract: The present invention provides fan optical polarized light source device. The polarized light source device includes at least one carbon nanotube bundle (204) and two gold electrodes (206) respectively connected to ends of the bundle. The bundle has a length of approximately 600 microns, and includes a number of carbon nanotubes bundled together and substantially parallel to each other. Each electrode includes at least one gold wire, which is bonded to an inside of an end of the bundle by an ultrasonic wire bonder. When the polarized light source device is connected to an electrical source, a polarized incandescent light beam emits from the bundle of the polarized light source device. A direction of polarization of the light beam is parallel to an axis of the bundle. The present invention further provides a method of fabricating the polarized light source device.
    Type: Grant
    Filed: October 9, 2003
    Date of Patent: October 18, 2005
    Assignees: Tsinghua University, Hon Hai Precision Ind. Co., Ltd.
    Inventors: Peng Li, KaiLi Jiang, QunQing Li, ShouShan Fan
  • Publication number: 20040179258
    Abstract: The present invention provides an optical polarized light source device. The polarized light source device includes at least one carbon nanotube bundle (204) and two gold electrodes (206) respectively connected to ends of the bundle. The bundle has a length of approximately 600 microns and includes a number of carbon nanotubes bundled together and substantially parallel to each other. Each electrode includes at least one gold wire, which is bonded to inside of an end of the bundle by an ultrasonic wire bonder. When the polarized light source device is connected to an electrical source, a polarized incandescent light beam emits from the bundle of the polarized light source device. A direction of polarization of the light beam is parallel to an axis of the bundle. The present invention further provides a method of fabricating the polarized light source device.
    Type: Application
    Filed: October 9, 2003
    Publication date: September 16, 2004
    Inventors: Peng Li, Kaili Jiang, QunQing Li, ShouShan Fan
  • Publication number: 20040053053
    Abstract: A method for forming a carbon nanotube array includes the following steps: providing a smooth substrate (11); depositing a metal catalyst layer (21) on a surface of the substrate; heating the treated substrate to a predetermined temperature in flowing protective gas; and introducing a mixture of carbon source gas and protective gas for 5-30 minutes, thus forming a carbon nanotube array (61) extending from the substrate. When the mixture of carbon source gas and protective gas is introduced, a temperature differential greater than 50° C. between the catalyst and its surrounding environment is created by adjusting a flow rate of the carbon source gas. Further, a partial pressure of the carbon source gas is maintained lower than 20%, by adjusting a ratio of the flow rates of the carbon source gas and the protective gas. The carbon nanotubes formed in the carbon nanotube array are well bundled.
    Type: Application
    Filed: December 31, 2002
    Publication date: March 18, 2004
    Inventors: KaiLi Jiang, ShouShan Fan, QunQing Li
  • Publication number: 20040053780
    Abstract: A method of fabricating a long carbon nanotube yarn includes the following steps: (1) providing a flat and smooth substrate; (2) depositing a catalyst on the substrate; (3) positioning the substrate with the catalyst in a furnace; (4) heating the furnace to a predetermined temperature; (5) supplying a mixture of carbon containing gas and protecting gas into the furnace; (6) controlling a difference between the local temperature of the catalyst and the furnace temperature to be at least 50° C.; (7) controlling the partial pressure of the carbon containing gas to be less than 0.2; (8) growing a number of carbon nanotubes on the substrate such that a carbon nanotube array is formed on the substrate; and (9) drawing out a bundle of carbon nanotubes from the carbon nanotube array such that a carbon nanotube yarn is formed.
    Type: Application
    Filed: December 31, 2002
    Publication date: March 18, 2004
    Inventors: KaiLi Jiang, Shoushan Fan, QunQing Li
  • Publication number: 20040051432
    Abstract: A light filament (206) formed from carbon nanotubes is characterized by high mechanical strength and durability at elevated temperatures, a high surface area to volume ratio, and high emissivity. Additionally, electrical resistance of the light filament does not increase with increasing temperature as much as electrical resistance of metallic light filaments. Accordingly, power consumption of the light filament is low at incandescent operating temperatures. A method for making a light filament made of carbon nanotubes includes the steps of: forming an array of carbon nanotubes (20); pulling out carbon nanotube yarn (204) from the carbon nanotube array; and winding the yarn between two leads (30) functioning as electrodes to form the light filament.
    Type: Application
    Filed: December 31, 2002
    Publication date: March 18, 2004
    Inventors: KaiLi Jiang, ShouShan Fan, QunQing Li