Patents by Inventor Junaid Ahmed

Junaid Ahmed 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: 6979252
    Abstract: A low defectivity colloidal silica-based product slurry for use in chemical mechanical planarization (CMP) and an associated production method are described. The product slurry is produced using centrifugation of and optionally with addition of a surfactant to a starting colloidal silica (which can be a commercially available colloidal silica). The product slurry has substantially lower levels of soluble polymeric silicates than does the starting colloidal silica and affords lower defectivity levels when used in a slurry for CMP processing than does the starting colloidal silica.
    Type: Grant
    Filed: January 6, 2005
    Date of Patent: December 27, 2005
    Assignee: DuPont Air Products Nanomaterials LLC
    Inventors: Junaid Ahmed Siddiqui, Daniel Hernandez Castillo, II, Rajat Kapoor, Tara Ranae Keefover, Robin Edward Richards
  • Patent number: 6893476
    Abstract: A composition and associated methods for chemical mechanical planarization (or other polishing) are described. The composition may comprise an abrasive and a dispersed hybrid organic/inorganic particle. The composition may further comprise an alkyne compound. Two different methods for chemical mechanical planarization are disclosed. In one method (Method A), the CMP slurry composition employed in the method comprises comprise an abrasive and a dispersed hybrid organic/inorganic particle. In another method (Method B), the CMP slurry composition employed in the method comprises comprise an abrasive and an alkyne compound. The composition may further comprise an oxidizing agent in which case the composition is particularly useful in conjunction with the associated methods (A and B) for metal CMP applications (e.g., tungsten CMP).
    Type: Grant
    Filed: December 9, 2002
    Date of Patent: May 17, 2005
    Assignee: DuPont Air Products Nanomaterials LLC
    Inventors: Junaid Ahmed Siddiqui, Timothy Frederick Compton
  • Publication number: 20040144038
    Abstract: A composition and associated method for oxide chemical mechanical planarization (or other polishing) are described. The composition and associated method afford high oxide removal rates while they simultaneously afford low levels of defectivity, haze, and scratching during polishing (e.g., CMP). The composition comprises an abrasive, a fluoride salt, and an acetylenic alcohol.
    Type: Application
    Filed: December 8, 2003
    Publication date: July 29, 2004
    Inventor: Junaid Ahmed Siddiqui
  • Patent number: 6759178
    Abstract: A printing plate includes a substantially free gelatin free polymeric film which includes a coating layer of a polymer having at least one -POXY pendant group, pendant carboxyl groups and further comprises a sulphonated monomer, salt or derivative.
    Type: Grant
    Filed: July 31, 2002
    Date of Patent: July 6, 2004
    Assignee: DuPont Teijin Films US Limited Partnership
    Inventors: Noel Stephen Brabbs, Andrew Charles Street, Karen Goodchild, Cornell Chappel, Jr., Junaid Ahmed Siddiqui, Stephen Derek Rogers
  • Publication number: 20040107650
    Abstract: A composition and associated methods for chemical mechanical planarization (or other polishing) are described. The composition may comprise an abrasive and a dispersed hybrid organic/inorganic particle. The composition may further comprise an alkyne compound. Two different methods for chemical mechanical planarization are disclosed. In one method (Method A), the CMP slurry composition employed in the method comprises comprise an abrasive and a dispersed hybrid organic/inorganic particle. In another method (Method B), the CMP slurry composition employed in the method comprises comprise an abrasive and an alkyne compound. The composition may further comprise an oxidizing agent in which case the composition is particularly useful in conjunction with the associated methods (A and B) for metal CMP applications (e.g., tungsten CMP).
    Type: Application
    Filed: December 9, 2002
    Publication date: June 10, 2004
    Inventors: Junaid Ahmed Siddiqui, Timothy Frederick Compton
  • Patent number: 6743267
    Abstract: Gel-free colloidal abrasive polishing compositions and associated methods for polishing (e.g., chemical mechanical polishing) are described. These abrasive polishing compositions are comprised of a surface-modified colloidal abrasive that has been modified with a boron-containing compound(s), such as boron surface-modified colloidal ceria or silica. These compositions are useful in chemical mechanical planarization (CMP) applications as well as in substrate polishing applications. These abrasive compositions are most often negatively-charged colloids, which remain as stable negatively-charged colloids even in acidic media.
    Type: Grant
    Filed: September 17, 2002
    Date of Patent: June 1, 2004
    Assignee: DuPont Air Products Nanomaterials LLC
    Inventors: Peter Jernakoff, Junaid Ahmed Siddiqui
  • Publication number: 20030114083
    Abstract: Gel-free colloidal abrasive polishing compositions and associated methods for polishing (e.g., chemical mechanical polishing) are described. These abrasive polishing compositions are comprised of a surface-modified colloidal abrasive that has been modified with a boron-containing compound(s), such as boron surface-modified colloidal ceria or silica. These compositions are useful in chemical mechanical planarization (CMP) applications as well as in substrate polishing applications. These abrasive compositions are most often negatively-charged colloids, which remain as stable negatively-charged colloids even in acidic media.
    Type: Application
    Filed: September 17, 2002
    Publication date: June 19, 2003
    Inventors: Peter Jernakoff, Junaid Ahmed Siddiqui
  • Publication number: 20030013042
    Abstract: A polymeric film which is substantially gelatin free has a polymeric film substrate and a coating layer containing a polymer having at least one or more repeating units having at least one or more pendant (—POXY) groups, wherein X and Y, which may be the same or different, are OH or OM wherein M is a cation. The polymeric film is suitable for use as a component of a printing plate.
    Type: Application
    Filed: July 31, 2002
    Publication date: January 16, 2003
    Inventors: Noel Stephen Brabbs, Cornell Chappel, Karen Goodchild, Andrew Charles Street, Junaid Ahmed Siddiqui, Stephen Derek Rogers
  • Patent number: 6495309
    Abstract: A substantially gelatin free polymeric film includes a coating layer of a polymer having at least one —POXY pendant group, pendant carboxyl group or capable of forming carboxyl groups and further comprises a sulphonated monomer, salt or derivative.
    Type: Grant
    Filed: June 21, 2000
    Date of Patent: December 17, 2002
    Assignees: E.I. Du Pont de Nemours and Company, Du Pont Teijin Films U.S. Limited Partnership
    Inventors: Noel Stephen Brabbs, Andrew Charles Street, Karen Goodchild, Cornell Chappel, Jr., Junaid Ahmed Siddiqui, Stephen Derek Rogers
  • Patent number: 6117532
    Abstract: An oriented polyester film coated on at least one surface with a coating that improves its adhesion to gelatin is disclosed. The dry coating contains one or more sulfopolyesters; one or more tetrablock copolymer resins; and one or more non-volatile polyamines. Other ingredients, such as particulate materials and surfactants, may be present in the coating. The coating is preferably applied at the interdraw stage.
    Type: Grant
    Filed: October 30, 1997
    Date of Patent: September 12, 2000
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Junaid Ahmed Siddiqui, Cornell Chappell, Jr
  • Patent number: 6060156
    Abstract: An orientated polyester film coated on at least one surface with a coating that improves its antiblocking properties is disclosed. The coating contains an organic polymer and about 0.002% to 1.5% by weight, based on the weight of the coating, of porous particles that have a pore volume of at least 0.03 mL/g and a particle size of about 0.5 .mu.m to 4.5 .mu.m.
    Type: Grant
    Filed: March 30, 1998
    Date of Patent: May 9, 2000
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Cornell Chappell, Jr., Junaid Ahmed Siddiqui
  • Patent number: 5883528
    Abstract: An input circuit to a semiconductor device may selectively accept different voltage logic levels (e.g., TTL or CMOS) as selected by a preset selection signal. The selection signal activates an N-type or P-type transistor in the input circuit which alters the threshold switching voltage of the input circuit logic. By altering the input threshold voltage, both TTL and CMOS input signals may be correctly triggered. An additional circuitry may be provided to allow a low voltage circuit (e.g., 3.3 Volts) to be tolerant of higher voltage inputs (e.g., 5 Volts). An isolation transistor isolates the input of the circuit from the high voltage signal, while a pulldown transistor pulls a high logic, high voltage signal down to supply voltage level.
    Type: Grant
    Filed: March 20, 1997
    Date of Patent: March 16, 1999
    Assignee: Cirrus Logic, Inc.
    Inventors: Abdul Qayyum Kashmiri, Junaid Ahmed Ahmed, Han My Kim