Patents by Inventor Ramakrishna Ravikiran

Ramakrishna Ravikiran 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: 7378456
    Abstract: The present invention relates to a directly photoimageable polymer composition (DPPC) and methods for its use in forming microelectronic and optoelectronic devices. Such DPPC encompasses a polymer having at least one norbornene-type repeat unit having a pendant silyl containing radical and at least one norbornene-type repeat unit having an acrylate containing radical.
    Type: Grant
    Filed: January 27, 2005
    Date of Patent: May 27, 2008
    Assignee: Promerus LLC
    Inventors: Edmund Elce, Ramakrishna Ravikiran, Larry F. Rhodes, Robert Shick, Saikumar Jayaraman
  • Publication number: 20080027246
    Abstract: Embodiments in accordance with the present invention are directed to providing processes for forming fluorinated-alkyl and particularly perfluorinated-alkyl sulfonamide substituted norbornene-type monomers.
    Type: Application
    Filed: June 26, 2007
    Publication date: January 31, 2008
    Inventors: Andrew Bell, Ramakrishna Ravikiran, Dietrich Fabricius, Peter Newsome
  • Publication number: 20070148566
    Abstract: Embodiments in accordance with the present invention provide waveguide structures and methods of forming such structures where core and laterally adjacent cladding regions are defined. Some embodiments of the present invention provide waveguide structures where core regions are collectively surrounded by laterally adjacent cladding regions and cladding layers and methods of forming such structures.
    Type: Application
    Filed: November 22, 2004
    Publication date: June 28, 2007
    Applicant: SUMITOMO BAKELITE CO., LTD.
    Inventors: Koji Choki, Tetsuya Mori, Ramakrishna Ravikiran, Makoto Fujiwara, Keizo Takahama, Kei Watanabe, Hirotaka Nonaka, Yumiko Otake, Andrew Bell, Larry Rhodes, Dino Amoroso, Mutsuhiro Matsuyama
  • Publication number: 20060008734
    Abstract: Some embodiments in accordance with the present invention relate to norbornene-type polymers and to photosensitive dielectric resin compositions formed therefrom. Other embodiments relate to films formed from such compositions and to devices, such as electrical, electronic and optoelectronic devices, that encompass such films.
    Type: Application
    Filed: July 1, 2005
    Publication date: January 12, 2006
    Inventors: Dino Amoroso, Brian Bedwell, Andrew Bell, Edmund Elce, Rajesh Puthenkovilakom, Ramakrishna Ravikiran, Robert Shick, Xiaoming Wu, Hiroaki Makabe, Yasunori Takahashi, Etsu Takeuchi, Daoji Gan, Seok Kang
  • Publication number: 20050192409
    Abstract: Embodiments in accordance with the present invention encompass polymers having at least one norbornene-type repeating unit derived from a norbornene-type monomer having a polyhedral oligosilsesquioxane pendant group. Such polymers, are formed by addition polymerizations that employ one of a neutral or cationic palladium catalyst or a neutral nickel catalyst. Such polymers are useful for a variety of applications such as a positive tone or negative tone photodefinable material, a low-k dielectric constant material, an etch selective layer, a sacrificial material or the like. In addition, embodiments of the present invention include devices formed using such polymers.
    Type: Application
    Filed: February 10, 2005
    Publication date: September 1, 2005
    Inventors: Larry Rhodes, Larry Seger, Ramakrishna Ravikiran, Edmund Elce, Robert Shick, John-Henry Lipian
  • Publication number: 20050186502
    Abstract: The present invention relates to a directly photoimageable polymer composition (DPPC) and methods for its use in forming microelectronic and optoelectronic devices. Such DPPC encompasses a polymer having at least one norbornene-type repeat unit having a pendant silyl containing radical and at least one norbornene-type repeat unit having an acrylate containing radical.
    Type: Application
    Filed: January 27, 2005
    Publication date: August 25, 2005
    Inventors: Edmund Elce, Ramakrishna Ravikiran, Larry Rhodes, Robert Shick, Saikumar Jayaraman
  • Patent number: 6903171
    Abstract: Methods for the addition polymerization of cycloolefins using a cationic Group 10 metal complex and a weakly coordinating anion of the formula: [(R?)zM(L?)x(L?)y]b[WCA]d wherein [(R?)zM(L?)x(L?)y] is a cation complex where M represents a Group 10 transition metal; R? represents an anionic hydrocarbyl containing ligand; L? represents a Group 15 neutral electron donor ligand; L? represents a labile neutral electron donor ligand; x is 1 or 2; and y is 0, 1, 2, or 3; and z is 0 or 1, wherein the sum of x, y, and z is 4; and [WCA] represents a weakly coordinating counteranion complex; and b and d are numbers representing the number of times the cation complex and weakly coordinating counteranion complex are taken to balance the electronic charge on the overall catalyst complex.
    Type: Grant
    Filed: October 15, 2002
    Date of Patent: June 7, 2005
    Assignee: Promerus, LLC
    Inventors: Larry Funderburk Rhodes, Andrew Bell, Ramakrishna Ravikiran, John C. Fondran, Saikumar Jayaraman, Brian Leslie Goodall, Richard A. Mimna, John-Henry Lipian
  • Patent number: 6677175
    Abstract: The invention provides a method for producing an optical waveguide that includes the steps of: (a) forming a core structure, the core structure including an at least partially cured core composition, on a master defining a waveguide pattern; (b) applying over the top of the core structure and the master a cladding layer including a liquid cladding composition; (c) curing the cladding layer to form a core/cladding combination; and removing the core/cladding combination from the master so as to expose at least a portion of the core structure, wherein the refractive index of the core material is at least about 0.05 percent higher than the refractive index of the cladding material.
    Type: Grant
    Filed: July 27, 2001
    Date of Patent: January 13, 2004
    Assignees: Promerus, LLC, 3M Innovative Properties Company
    Inventors: Xiao-Mei Zhao, Ramakrishna Ravikiran, Phillip S. Neal, Robert A. Shick, James E. Watson, Thomas M. Kafka, Davy Chum, Raymond P. Johnston
  • Patent number: 6538087
    Abstract: The present invention relates to polymer compositions and methods of polymerizing such compositions. Furthermore, the present invention relates to polymer compositions that are useful in forming waveguides and to methods for making waveguides using such polymer compositions.
    Type: Grant
    Filed: July 27, 2001
    Date of Patent: March 25, 2003
    Assignee: Promerus, LLC
    Inventors: Xiao-Mei Zhao, Ramakrishna Ravikiran, Phillip S. Neal, Robert A. Shick, Larry F. Rhodes, Andrew Bell
  • Publication number: 20020103317
    Abstract: The present invention relates to polymer compositions and methods of polymerizing such compositions. Furthermore, the present invention relates to polymer compositions that are useful in forming waveguides and to methods for making waveguides using such polymer compositions.
    Type: Application
    Filed: July 27, 2001
    Publication date: August 1, 2002
    Inventors: Xiao-Mei Zhao, Ramakrishna Ravikiran, Phillip S. Neal, Robert A. Shick, Larry F. Rhodes, Andrew Bell
  • Publication number: 20020064896
    Abstract: The invention provides a method for producing an optical waveguide that includes the steps of: (a) forming a core structure, the core structure including an at least partially cured core composition, on a master defining a waveguide pattern; (b) applying over the top of the core structure and the master a cladding layer including a liquid cladding composition; (c) curing the cladding layer to form a core/cladding combination; and removing the core/cladding combination from the master so as to expose at least a portion of the core structure, wherein the refractive index of the core material is at least about 0.05 percent higher than the refractive index of the cladding material.
    Type: Application
    Filed: July 27, 2001
    Publication date: May 30, 2002
    Inventors: Xiao-Mei Zhao, Ramakrishna Ravikiran, Phillip S. Neal, Robert A. Shick, James E. Watson, Thomas M. Kafka, Davy Chum, Raymond P. Johnston
  • Patent number: 6140405
    Abstract: A low molecular weight polyether oligomer is modified with a salt during chain extending reaction of the polyether oligomer to form electrostatic dissipative polymer products such as polyurethanes, polyether amide block copolymers and polyether-ester block copolymers. The reaction product polymers exhibit relatively low surface and volume resistivities, and static decay times which are not too fast or too slow, yet are free of excessive amounts of extractable anions, particularly chlorine, nitrate, phosphate and sulfate. The electrostatic dissipative polymers can be blended with a variety of base polymers to form plastic alloys, which in turn can be utilized to form articles useful in the manufacture of electrostatic sensitive electronic devices.
    Type: Grant
    Filed: September 21, 1998
    Date of Patent: October 31, 2000
    Assignee: The B. F. Goodrich Company
    Inventors: Yona Eckstein, Ramakrishna Ravikiran