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).
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Patent number: 10435618Abstract: Surfactant compositions useful for oil recovery are disclosed. The compositions comprise from 10 to 80 wt. % of a propoxylated C12-C20 alcohol sulfate, from 10 to 80 wt. % of a C12-C20 internal olefin sulfonate, and from 0.1 to 10 wt. % of an ethoxylated C4-C12 alcohol sulfate. Surprisingly, including a minor proportion of the ethoxylated alcohol sulfate reduces or eliminates the need to rely on costly cosolvents for achieving good performance in enhanced oil recovery processes. In particular, low interfacial tensions and low microemulsion viscosities can be achieved when the ethoxylated alcohol sulfate accompanies the propoxylated alcohol sulfate and internal olefin sulfonate. Aqueous concentrates comprising water and the surfactant compositions described above are also disclosed. Dilution of the surfactant composition or aqueous concentrate with water or brine to the desired anionic actives level provides an injectable composition useful for EOR applications.Type: GrantFiled: January 6, 2017Date of Patent: October 8, 2019Assignee: Stepan CompanyInventors: Ramakrishna Ravikiran, Jieyuan Zhang
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Publication number: 20170114270Abstract: Surfactant compositions useful for oil recovery are disclosed. The compositions comprise from 10 to 80 wt. % of a propoxylated C12-C20 alcohol sulfate, from 10 to 80 wt. % of a C12-C20 internal olefin sulfonate, and from 0.1 to 10 wt. % of an ethoxylated C4-C12 alcohol sulfate. Surprisingly, including a minor proportion of the ethoxylated alcohol sulfate reduces or eliminates the need to rely on costly cosolvents for achieving good performance in enhanced oil recovery processes. In particular, low interfacial tensions and low microemulsion viscosities can be achieved when the ethoxylated alcohol sulfate accompanies the propoxylated alcohol sulfate and internal olefin sulfonate. Aqueous concentrates comprising water and the surfactant compositions described above are also disclosed. Dilution of the surfactant composition or aqueous concentrate with water or brine to the desired anionic actives level provides an injectable composition useful for EOR applications.Type: ApplicationFiled: January 6, 2017Publication date: April 27, 2017Inventors: Ramakrishna Ravikiran, Jieyuan Zhang
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Patent number: 9567512Abstract: Surfactant compositions useful for oil recovery comprise from 10 to 80 wt. % of a prapoxylated C12-C20 alcohol sulfate, from 10 to 80 wt. % of a C12-C20 internal olefin sulfonate, and from 0.1 to 10 wt. % of an ethoxylated C4-C12 alcohol sulfate. A minor proportion of the ethoxylated alcohol sulfate reduces or eliminates the need to rely on costly cosolvents for achieving good performance in enhanced oil recovery processes. Low interfaoial tensions and low microemulsion viscosities can be achieved when the ethoxylated alcohol sulfate accompanies the propoxytated alcohol sulfate and internal olefin sulfonate. Aqueous concentrates comprising water and the surfactant compositions described above are also disclosed. Dilution of the surfactant composition or aqueous concentrate with water or brine to the desired anionic actives level provides an injectable composition useful for EOR applications.Type: GrantFiled: May 14, 2012Date of Patent: February 14, 2017Assignee: Stepan CompanyInventors: Ramakrishna Ravikiran, Jieyuan Zhang
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Publication number: 20140073541Abstract: Surfactant compositions useful for oil recovery comprise from 10 to 80 wt. % of a prapoxylated C12-C20 alcohol sulfate, from 10 to 80 wt. % of a C12-C20 internal olefin sulfonate, and from 0.1 to 10 wt. % of an ethoxylated C4-C12 alcohol sulfate. A minor proportion of the ethoxylated alcohol sulfate reduces or eliminates the need to rely on costly cosolvents for achieving good performance in enhanced oil recovery processes. Low interfaoial tensions and low microemulsion viscosities can be achieved when the ethoxylated alcohol sulfate accompanies the propoxytated alcohol sulfate and internal olefin sulfonate. Aqueous concentrates comprising water and the surfactant compositions described above are also disclosed. Dilution of the surfactant composition or aqueous concentrate with water or brine to the desired anionic actives level provides an injectable composition useful for EOR applications.Type: ApplicationFiled: May 14, 2012Publication date: March 13, 2014Applicant: STEPAN COMPANYInventors: Ramakrishna Ravikiran, Jieyuan Zhang
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Patent number: 8420293Abstract: 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: GrantFiled: August 10, 2011Date of Patent: April 16, 2013Assignees: Sumitomo Bakelite Co., Ltd., Promerus, LLCInventors: Koji Choki, Tetsuya Mori, Ramakrishna Ravikiran, Makoto Fujiwara, Keizo Takahama, Kei Watanabe, Hirotaka Nonaka, Yumiko Otake, Andrew Bell, Larry Rhodes, Dino Amoroso, Mutsuhiro Matsuyama
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Patent number: 8403044Abstract: A process for recovering oil from an oil-bearing formation comprises introducing into said formation an aqueous composition comprising at least one sulfonated derivative of one or more internal olefins, said internal olefins being characterized by having low amounts of tri-substitution on the olefin bond, said sulfonated derivative being obtained by sulfonating a composition comprising internal olefins of the formula: R1R2C?CR3R4 wherein R1, R2, R3 and R4 are the same or different and are hydrogen or straight- or branched-chain, saturated hydrocarbyl groups and the total number of carbon atoms of R1, R2, R3 and R4 is 6 to 44 with the proviso that at least about 96 mole percent of R1 and R3 are straight- or branched-chain, saturated hydrocarbyl groups and at least about 96 mole percent of R2 and R4 are hydrogen.Type: GrantFiled: May 5, 2010Date of Patent: March 26, 2013Assignee: Stepan CompanyInventors: John C. Hutchison, Patrick Shane Wolfe, Thomas Edward Waldman, Ramakrishna Ravikiran
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Publication number: 20120064458Abstract: 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: ApplicationFiled: August 10, 2011Publication date: March 15, 2012Applicants: PROMERUS, LLC, SUMITOMO BAKELITE COMPANY LIMITEDInventors: Koji CHOKI, Tetsuya Mori, Ramakrishna Ravikiran, Makoto Fujiwara, Keizo Takahama, Kei Watanabe, Hirotaka Nonaka, Yumiko Otake, Andrew Bell, Larry Rhodes, Dino Amoroso, Mutsuhiro Matsuyama
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Patent number: 8053515Abstract: A polymer includes a first type of repeat unit represented by Formula I: where X is selected from —CH2—, —CH2—CH2—, or —O—; m is an integer from 0 to about 5; and where for the first type of repeat unit one of R1, R2, R3, and R4 is one of a maleimide containing group and for the second type of repeat unit one of R1, R2, R3, and R4 is a hindered aromatic group, a C8 or greater alkyl group, a C4 or greater halohydrocarbyl or perhalocarbyl group, a C7 or greater aralkyl group, or a heteroatom hydrocarbyl or halohydrocarbyl group.Type: GrantFiled: December 3, 2007Date of Patent: November 8, 2011Assignee: Promerus LLCInventors: Edmund Elce, Andrew Bell, Brian Knapp, Hendra Ng, Larry F. Rhodes, Robert Shick, Wei Zhang, William DiMenna, Saikumar Jayaraman, Jianyong Jin, Rajesh Raja Puthenkovilakom, Ramakrishna Ravikiran, Xiaoming Wu, Etsu Takeuchi
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Patent number: 8053166Abstract: 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: GrantFiled: September 3, 2009Date of Patent: November 8, 2011Assignees: Sumitomo Bakelite Co. Ltd., Promerus, LLC.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
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Patent number: 8021825Abstract: 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: GrantFiled: September 3, 2009Date of Patent: September 20, 2011Assignees: Sumitomo Bakelite Co., Ltd., Promerus, LLC.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
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Patent number: 7910674Abstract: 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: GrantFiled: June 18, 2003Date of Patent: March 22, 2011Assignee: Promerus, LLCInventors: Larry Funderburk Rhodes, Andrew Bell, Ramakrishna Ravikiran, John C. Fondran, Saikumar Jayaraman, Brian Leslie Goodall, Richard A. Mimna, John-Henry Lipian
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Patent number: 7858721Abstract: 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: GrantFiled: April 27, 2009Date of Patent: December 28, 2010Assignee: Promerus LLCInventors: Dino Amoroso, Brian Bedwell, Andrew Bell, Edmund Elce, Rajesh Raja Puthenkovilakom, Ramakrishna Ravikiran, Robert Shick, Xiaoming Wu, Hiroaki Makabe, Yasunori Takahashi, Etsu Takeuchi, Daoji Gan, Seok Ho Kang
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Patent number: 7851575Abstract: A polymer comprising polycyclic repeating units having recurring ion conducting groups and optional crosslinkable groups is disclosed. The present invention provides the capability of tailoring polymers to impart unique properties to membranes fabricated from the polymers. Membranes comprising the polymers and methods for preparing the membranes and their use in ion conducting membranes, particularly in fuel cells, are also provided.Type: GrantFiled: November 9, 2007Date of Patent: December 14, 2010Assignee: Promerus LLCInventors: Ramakrishna Ravikiran, Xiaoming Wu, Larry F. Rhodes, Robert A. Shick, Hiroko Nakano, Hirotaka Nonaka, Huabin Wang, Robert John Duff, Saikumar Jayaraman, John-Henry Lipian
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Publication number: 20100282467Abstract: A process for recovering oil from an oil-bearing formation comprises introducing into said formation an aqueous composition comprising at least one sulfonated derivative of one or more internal olefins, said internal olefins being characterized by having low amounts of tri-substitution on the olefin bond, said sulfonated derivative being obtained by sulfonating a composition comprising internal olefins of the formula: R1R2C?CR3R4 wherein R1, R2, R3 and R4 are the same or different and are hydrogen or straight- or branched-chain, saturated hydrocarbyl groups and the total number of carbon atoms of R1, R2, R3 and R4 is 6 to 44 with the proviso that at least about 96 mole percent of R1 and R3 are straight- or branched-chain, saturated hydrocarbyl groups and at least about 96 mole percent of R2 and R4 are hydrogen.Type: ApplicationFiled: May 5, 2010Publication date: November 11, 2010Applicant: Stepan CompanyInventors: John C. Hutchison, Patrick Shane Wolfe, Thomas Edward Waldman, Ramakrishna Ravikiran
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Patent number: 7820356Abstract: 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: GrantFiled: November 22, 2004Date of Patent: October 26, 2010Assignees: Sumitomo Bakelite Co. Ltd., Promerus, LLCInventors: Koji Choki, Tetsuya Mori, Ramakrishna Ravikiran, Makoto Fujiwara, Keizo Takahama, Kei Watanabe, Hirotaka Nonaka, Yumiko Otake, Andrew Bell, Larry Rhodes, Dino Amoroso, Mutsuhiro Matsuyama
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Publication number: 20100061688Abstract: 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: ApplicationFiled: September 3, 2009Publication date: March 11, 2010Applicants: SUMITOMO BAKELITE CO., LTD., PROMERUS, LLCInventors: Koji Choki, Tetsuya Mori, Ramakrishna Ravikiran, Makoto Fujiwara, Keizo Takahama, Kei Watanabe, Hirotaka Nonaka, Yumiko Otake, Andrew Bell, Larry Rhodes, Dino Amoroso, Mutsuhiro Matsuyama
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Publication number: 20100062378Abstract: 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: ApplicationFiled: September 3, 2009Publication date: March 11, 2010Applicants: SUMITOMO BAKELITE CO., LTD., PROMERUS, LLCInventors: Koji Choki, Tetsuya Mori, Ramakrishna Ravikiran, Makoto Fujiwara, Keizo Takahama, Kei Watanabe, Hirotaka Nonaka, Yumiko Otake, Andrew Bell, Larry Rhodes, Dino Amoroso, Mutsuhiro Matsuyama
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Publication number: 20090215976Abstract: 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: ApplicationFiled: April 27, 2009Publication date: August 27, 2009Inventors: Dino Amoroso, Brian Bedwell, Andrew Bell, Edmund Elce, Rajesh Raja Puthenkovilakom, Ramakrishna Ravikiran, Robert Shick, Xiaoming Wu, Hiroaki Makabe, Yasunori Takahashi, Daoji Gan, Etsu Takeuchi, Seok Ho Kang
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Patent number: 7524594Abstract: 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: GrantFiled: July 1, 2005Date of Patent: April 28, 2009Assignee: Promerus LLCInventors: Dino Amoroso, Brian Bedwell, Andrew Bell, Edmund Elce, Rajesh Raja Puthenkovilakom, Ramakrishna Ravikiran, Robert Shick, Xiaoming Wu, Hiroaki Makabe, Yasunori Takahashi, Etsu Takeuchi, Daoji Gan, Seok Ho Kang
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Publication number: 20080194740Abstract: A polymer includes a first type of repeat unit represented by Formula I: where X is selected from —CH2—, —CH2—CH2—, or —O—; m is an integer from 0 to about 5; and where for the first type of repeat unit one of R1, R2, R3, and R4 is one of a maleimide containing group and for the second type of repeat unit one of R1, R2, R3, and R4 is a hindered aromatic group, a C8 or greater alkyl group, a C4 or greater halohydrocarbyl or perhalocarbyl group, a C7 or greater aralkyl group, or a heteroatom hydrocarbyl or halohydrocarbyl group.Type: ApplicationFiled: December 3, 2007Publication date: August 14, 2008Inventors: Edmund Elce, Andrew Bell, Brian Knapp, Hendra Ng, Larry F. Rhodes, Robert Shick, Wei Zhang, William DiMenna, Saikumar Jayaraman, Jianyong Jin, Rajesh Raja Puthenkovilakom, Ramakrishna Ravikiran, Xiaoming Wu, Etsu Takeuchi