Patents by Inventor Revathi Iyengar
Revathi Iyengar 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: 6924171Abstract: Methods for fabricating microelectronic interconnection structures as well as the structures formed by the methods are disclosed which improve the manufacturing throughput for assembling flip chip semiconductor devices. The use of a bilayer of polymeric materials applied on the wafer prior to dicing eliminates the need for dispensing and curing underfill for each semiconductor at the package level, thereby improving manufacturing throughput and reducing cost.Type: GrantFiled: February 13, 2001Date of Patent: August 2, 2005Assignee: International Business Machines CorporationInventors: Stephen L. Buchwalter, David Danovitch, Fuad Elias Doany, Claudius Feger, Peter A. Gruber, Revathi Iyengar, Nancy C. LaBianca
-
Patent number: 6515051Abstract: Benzotriazole UV absorbers which are substituted at the 5-position of the benzo ring by an electron withdrawing group exhibit enhanced durability and very low loss rates when incorporated into automotive coatings. This is particularly the case when the 3-position of the phenyl ring is also substituted by phenyl or phenylalkyl such as &agr;-cumyl. Compounds where the 5-position of the benzo ring are substituted by perfluoroalkyl such as trifluoromethyl are particularly of interest for both their enhanced durability and for their excellent solubility and excellent color properties in some thermoplastic compositions when the phenyl ring is substituted at the 3-position by hydrogen or tert-alkyl.Type: GrantFiled: December 18, 2001Date of Patent: February 4, 2003Assignee: Ciba Specialty Chemicals CorporationInventors: Ramanathan Ravichandran, Joseph Suhadolnik, Mervin G. Wood, Anthony Debellis, Robert E. Detlefsen, Revathi Iyengar, Jean-Pierre Wolf
-
Patent number: 6506898Abstract: Provided is a process for preparing an at least bis-carbamate functional 1,3,5-triazine by contacting an at least diamino-1,3,5-triazine, an acyclic organic carbonate and a base, as well as certain novel compositions producible thereby. Also provided are substantially halogen contamination free crosslinker compositions comprising the products obtainable by the process, and curable compositions based upon these crosslinkers.Type: GrantFiled: May 25, 1995Date of Patent: January 14, 2003Assignee: Cytec Technology Corp.Inventors: Lawrence A. Flood, Ram B. Gupta, Revathi Iyengar, David A. Ley, Vankatarao K. Pai
-
Patent number: 6458872Abstract: Benzotriazole UV absorbers which are substituted at the 5-position of the benzo ring by an electron withdrawing group exhibit enhanced durability and very low loss rates when incorporated into automotive coatings. This is particularly the case when the 3-position of the phenyl ring is also substituted by phenyl or phenylalkyl such as &agr;-cumyl. Compounds where the 5-position of the benzo ring are substituted by perfluoroalkyl such as trifluoromethyl are particularly of interest for both their enhanced durability and for their excellent solubility and excellent color properties in some thermoplastic compositions when the phenyl ring is substituted at the 3-position by hydrogen or tert-alkyl.Type: GrantFiled: May 8, 2001Date of Patent: October 1, 2002Assignee: Ciba Specialty Chemicals CorporationInventors: Ramanathan Ravichandran, Joseph Suhadolnik, Mervin G. Wood, Anthony Debellis, Robert E. Detlefsen, Revathi Iyengar, Jean-Pierre Wolf
-
Publication number: 20020109228Abstract: Methods for fabricating microelectronic interconnection structures as well as the structures formed by the methods are disclosed which improve the manufacturing throughput for assembling flip chip semiconductor devices. The use of a bilayer of polymeric materials applied on the wafer prior to dicing eliminates the need for dispensing and curing underfill for each semiconductor at the package level, thereby improving manufacturing throughput and reducing cost.Type: ApplicationFiled: February 13, 2001Publication date: August 15, 2002Inventors: Stephen L. Buchwalter, David Danovitch, Fuad Elias Doany, Claudius Feger, Peter A. Gruber, Revathi Iyengar, Nancy C. LaBianca
-
Publication number: 20020065341Abstract: Benzotriazole UV absorbers which are substituted at the 5-position of the benzo ring by an electron withdrawing group exhibit enhanced durability and very low loss rates when incorporated into automotive coatings. This is particularly the case when the 3-position of the phenyl ring is also substituted by phenyl or phenylalkyl such as &agr;-cumyl. Compounds where the 5-position of the benzo ring are substituted by perfluoroalkyl such as trifluoromethyl are particularly of interest for both their enhanced durability and for their excellent solubility and excellent color properties in some thermoplastic compositions when the phenyl ring is substituted at the 3-position by hydrogen or tert-alkyl.Type: ApplicationFiled: May 7, 2001Publication date: May 30, 2002Inventors: Ramanathan Ravichandran, Joseph Suhadolnik, Mervin G. Wood, Anthony Debellis, Robert E. Detlefsen, Revathi Iyengar, Jean-Pierre Wolf
-
Patent number: 6288226Abstract: Provided is a process for preparing an at least bis-carbamate functional 1,3,5-triazine by contacting an at least diamino-1,3,5-triazine, an acyclic organic carbonate and a base, as well as certain novel compositions producible thereby. Also provided are substantially halogen contamination free crosslinker compositions comprising the products obtainable by the process, and curable compositions based upon these crosslinkers.Type: GrantFiled: October 6, 1998Date of Patent: September 11, 2001Assignee: Cytec Technology CorporationInventors: Lawrence A. Flood, Ram B. Gupta, Revathi Iyengar, David A. Ley, Venkatarao K. Pai
-
Patent number: 6268415Abstract: Adhesive compositions are rendered stable against degradation caused by ultraviolet light through the incorporation of a highly soluble, photostable benzotriazole UV absorber which is substituted in the ortho position of the hydroxyphenyl ring by &agr;-cumyl or phenyl. Examples of such compounds are 2-(2-hydroxy-3-&agr;-cumyl-5-tert-octylphenyl)-2H-benzotriazole, 5-chloro-2-(2-hydroxy-3-&agr;-cumyl-5-tert-octylphenyl)-2H-benzotriazole, 5-fluoro-2-(2-hydroxy-3-&agr;-cumyl-5-tert-octylphenyl)-2H-benzotriazole, 2-(2-hydroxy-3-&agr;-cumyl-5-tert-butylphenyl)-2H-benzotriazole, 5-chloro-2-(2-hydroxy-3-&agr;-cumyl-5-tert-butylphenyl)-2H-benzotriazole and 5-fluoro-2-(2-hydroxy-3-&agr;-cumyl-5-tert-butylphenyl)-2H-benzotriazole. These compounds exhibit excellent photostability and are highly soluble in adhesive formulations.Type: GrantFiled: May 3, 1999Date of Patent: July 31, 2001Assignee: Ciba Specialty Chemicals CorporationInventors: Walter Renz, Joseph Suhadolnik, Mervin Gale Wood, Jr., Ramanathan Ravichandran, Revathi Iyengar, Luther A. R. Hall
-
Patent number: 6262151Abstract: Benzotriazole UV absorbers which are substituted at the 5-position of the benzo ring by an electron withdrawing group exhibit enhanced durability and very low loss rates when incorporated into automotive coatings. This is particularly the case when the 3-position of the phenyl ring is also substituted by phenyl or phenylalkyl such as &agr;-cumyl. Compounds where the 5-position of the benzo ring are substituted by perfluoroalkyl such as trifluoromethyl are particularly of interest for both their enhanced durability and for their excellent solubility and excellent color properties in some thermoplastic compositions when the phenyl ring is substituted at the 3-position by hydrogen or tert-alkyl.Type: GrantFiled: July 12, 2000Date of Patent: July 17, 2001Assignee: Ciba Specialty Chemicals CorporationInventors: Ramanathan Ravichandran, Joseph Suhadolnik, Mervin G. Wood, Anthony Debellis, Robert E. Detlefsen, Revathi Iyengar, Jean-Pierre Wolf
-
Publication number: 20010007886Abstract: Benzotriazole UV absorbers which are substituted at the 5-position of the benzo ring by an electron withdrawing group exhibit enhanced durability and very low loss rates when incorporated into automotive coatings.Type: ApplicationFiled: January 11, 2001Publication date: July 12, 2001Inventors: Ramanathan Ravichandran, Joseph Suhadolnik, Mervin G. Wood, Anthony Debellis, Robert E. Detlefsen, Revathi Iyengar, Jean-Pierre Wolf
-
Patent number: 6225384Abstract: Adhesive compositions are rendered stable against degradation caused by ultraviolet light through the incorporation of a highly soluble, high extinction, photostable hydroxyphenyl-s-triazine UV absorber or mixtures of s-triazine UV absorbers. An example of such compounds is 2,4-bis(2,4-dimethylphenyl)-6-[2-hydroxy-4-(3-nonyloxy*-2-hydroxypropyloxy)-5-&agr;-cumylphenyl]-s-triazine (* denotes a mixture of octyloxy, nonyloxy and decyloxy groups). Such compounds exhibit high extinction, excellent photostability and are highly soluble in adhesive formulations. The laminated articles derived from these compositions include, for example, solar control films, films and glazings, UV absorbing glasses and glass coatings, windscreens, retroreflective sheetings and signs, solar reflectors, optical films and the like.Type: GrantFiled: April 17, 2000Date of Patent: May 1, 2001Assignee: Ciba Specialty Chemicals CorporationInventors: Walter Renz, Mervin Wood, Joseph Suhadonlik, Ramanathan Ravichandran, Revathi Iyengar, Pascal Hayoz
-
Patent number: 6191199Abstract: Adhesive compositions are rendered stable against degradation caused by ultraviolet light through the incorporation of a highly soluble, high extinction, photostable hydroxyphenyl-s-triazine UV absorber. An example of such compounds is 2,4-bis(2,4-dimethylphenyl)-6-[2-hydroxy-4-(3-nonyloxy*-2-hydroxypropyloxy)-5-&agr;-cumylphenyl]-s-triazine (* denotes a mixture of octyloxy, nonyloxy and decyloxy groups). Such compounds exhibit high extinction, excellent photostability and are highly soluble in adhesive formulations. The laminated articles derived from these compositions include, for example, solar control films, films and glazings, UV absorbing glasses and glass coatings, windscreens, retroreflective sheetings and signs, solar reflectors, optical films and the like.Type: GrantFiled: May 3, 1999Date of Patent: February 20, 2001Assignee: Ciba Speciatly Chemicals CorporationInventors: Walter Renz, Mervin Gale Wood, Jr., Joseph Suhadolnik, Ramanathan Ravichandran, Revathi Iyengar
-
Patent number: 6187845Abstract: Adhesive compositions are rendered stable against degradation caused by ultraviolet light through the incorporation of selected highly soluble, red-shifted, photostable benzotriazole UV absorbers which absorb light strongly in the 350 to 400 nm range. These UV absorbers exhibit excellent photostability and are highly soluble in adhesive formulations. The laminated articles derived from these compositions include, for example, solar control films, films and glazings, UV absorbing glasses and glass coatings, windscreens, retroreflective sheetings and signs, solar reflectors, optical films and the like.Type: GrantFiled: May 3, 1999Date of Patent: February 13, 2001Assignee: Ciba Specialty Chemicals CorporationInventors: Walter Renz, Mervin Gale Wood, Jr., Joseph Suhadolnik, Ramanathan Ravichandran, Revathi Iyengar
-
Patent number: 6166218Abstract: Benzotriazole UV absorbers which are substituted at the 5-position of the benzo ring by an electron withdrawing group exhibit enhanced durability and very low loss rates when incorporated into automotive coatings. This is particularly the case when the 3-position of the phenyl ring is also substituted by phenyl or phenylalkyl such as .alpha.-cumyl. Compounds where the 5-position of the benzo ring are substituted by perfluoroalkyl such as trifluoromethyl are particularly of interest for both their enhanced durability and for their excellent solubility and excellent color properties in some thermoplastic compositions when the phenyl ring is substituted at the 3-position by hydrogen or tert-alkyl.Type: GrantFiled: January 21, 1999Date of Patent: December 26, 2000Assignee: Ciba Specialty Chemicals CorporationInventors: Ramanathan Ravichandran, Joseph Suhadolnik, Mervin G. Wood, Anthony Debellis, Robert E. Detlefsen, Revathi Iyengar, Jean-Pierre Wolf
-
Patent number: 6063922Abstract: Provided is a novel carbamate functional 1,3,5-triazine of the general formula ##STR1## wherein Z' is selected from the group consisting of hydrogen, hydrocarbyl, and a group represented by the formula NHQ',each Q' is independently selected from the group consisting of a hydrocarbyl, a hydrocarbyloxy hydrocarbyl and a group represented by the formula COOY, with the proviso that at least two of the Q' groups are COOY, andeach Y is independently selected from the group consisting of a hydrocarbyl group and a hydrocarbyloxy hydrocarbyl ether group, with the proviso that at least one Y group is a hydrocarbyloxy hydrocarbyl ether group. These carbamate functional 1,3,5-triazines find use, for example, as crosslinkers or reactive modifiers in curable compositions.Type: GrantFiled: March 13, 1997Date of Patent: May 16, 2000Assignee: Cytec Technology Corp.Inventors: Lawrence A. Flood, Ram B. Gupta, Revathi Iyengar, David A. Ley, Vankatarao K. Pai
-
Patent number: 5977219Abstract: Benzotriazole UV absorbers which are substituted at the 5-position of the benzo ring by an electron withdrawing group exhibit enhanced durability and very low loss rates when incorporated into automotive coatings.Type: GrantFiled: October 30, 1997Date of Patent: November 2, 1999Assignee: Ciba Specialty Chemicals CorporationInventors: Ramanathan Ravichandran, Anthony David Debellis, Revathi Iyengar, Joseph Suhadolnik, Jean-Pierre Wolf, Robert Edward Detlefsen, Mervin Gale Wood
-
Patent number: 5849821Abstract: Selected s-triazines of formula I ##STR1## where G.sub.1 and G.sub.2 are biphenylyl moieties, are UV absorbers having high thermal stability and surprisingly high extinction coefficients making them of especial interest in stabilizing automotive coatings where such properties are highly valued.Type: GrantFiled: September 8, 1997Date of Patent: December 15, 1998Assignee: Ciba Specialty Chemicals CorporationInventors: Tyler A. Stevenson, Revathi Iyengar, Ramanathan Ravichandran
-
Patent number: 5792866Abstract: Provided is a process for preparing an at least bis-carbamate functional 1,3,5-triazine by contacting an at least diamino-1,3,5-triazine, an acyclic organic carbonate and a base, as well as certain novel compositions producible thereby. Also provided are substantially halogen contamination free crosslinker compositions comprising the products obtainable by the process, and curable compositions based upon these crosslinkers.Type: GrantFiled: May 25, 1995Date of Patent: August 11, 1998Assignee: Cytec Technology CorporationInventors: Lawrence A. Flood, Ram B. Gupta, Revathi Iyengar, David A. Ley, Vankatarao K. Pai
-
Patent number: 5726309Abstract: The s-triazines of formula I are UV absorbers having high thermal stability and surprisingly high extinction coefficients making them of especial value for stabilizing polymer subsnates, especially automotive coatings.Tris-aryl-s-triazines in which at least one of the aryl groups has an hydroxy group ortho to the point of attachment to the triazine ring are well known UV absorbers. It is also well-known that this class of triszines protect organic polymers from the deleterious effects of exposure to actinic radiation.The instant invention pertains to novel dimetic or oligomeric tris-aryl-s-triazines wherein at least one of the aryl groups is a biphenylyl or substituted biphenylyl moiety.More particularly, the instant invention relates to compounds of formula I ##STR1## wherein G.sub.1, G.sub.2, and E.sub.2 are here-in-below defined.Type: GrantFiled: August 27, 1996Date of Patent: March 10, 1998Assignee: Ciba Specialty Chemicals CorporationInventors: Tyler A. Stevenson, Revathi Iyengar, Ramanathan Ravichandran
-
Patent number: 5705641Abstract: Provided is a process for preparing an at least bis-carbamate functional 1,3,5-triazine by contacting an at least diamino-1,3,5-triazine, an acyclic organic carbonate and a base, as well as certain novel compositions producible thereby. Also provided are substantially halogen contamination free crosslinker compositions comprising the products obtainable by the process, and curable compositions based upon these crosslinkers.Type: GrantFiled: May 25, 1995Date of Patent: January 6, 1998Assignee: Cytec Technology Corp.Inventors: Lawrence A. Flood, Ram B. Gupta, Revathi Iyengar, David A. Ley, Vankatarao K. Pai