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Ram B Gupta, Pratibhash Chattopadhyay: Method of forming nanoparticles and microparticles of controllable size using supercritical fluids with enhanced mass transfer. Auburn University, Paul Beck & Associates, September 16, 2003: US06620351 (28 worldwide citation)

The current invention, Supercritical Antisolvent Precipitation with Enhanced Mass Transfer (SAS-EM) provides a significantly improved method for the production of nano and micro-particles with a narrow size distribution. The processes of the invention utilize the properties of supercritical fluids a ...


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Ram B Gupta: Process for preparing amide derivatives from haloaminotriazines and acid halides. American Cyanamid Company, Bart E Lerman, Frank M Van Riet, Michael J Kelly, February 22, 1994: US05288865 (26 worldwide citation)

This invention provides a process for preparing amide derivatives of acids by the reaction of haloaminotriazines and acid halides.


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Ram B Gupta, Hargurpreet Singh, Russell C Cappadona, Mark Paterna, Al Wagner: Non-yellowing ortho-dialkyl aryl substituted triazine ultraviolet light absorbers. Cytec Technology, James A Jubinsky, Fran Wasserman, Claire M Schultz, March 15, 2005: US06867250 (24 worldwide citation)

The invention relates generally to pyrimidines and triazines ultraviolet light absorbers containing a phenolic aromatic group(s) and a non-phenolic aromatic group(s) and the use thereof to protect against degradation by environmental forces, inclusive of ultraviolet light, actinic radiation, oxidati ...


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Ram B Gupta, Dennis J Jakiela: Non-yellowing part-tertiary-alkyl phenyl substituted triazine and pyrimidine ultraviolet light absorbers. Cytec Technology, Pennie & Edmonds, January 21, 2003: US06509399 (7 worldwide citation)

This invention relates generally to para-tertiary alkyl phenyl substituted pyrimidines and triazines and the use thereof to protect against degradation by environmental forces, inclusive of ultraviolet light, actinic radiation, oxidation, moisture, atmospheric pollutants and combinations thereof. Th ...


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Lawrence A Flood, Ram B Gupta, Revathi Iyengar, David A Ley, Vankatarao K Pai: Carbamate functional 1,3,5-triazines. Cytec Technology, Pennie & Edmonds, May 16, 2000: US06063922 (6 worldwide citation)

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',


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Ram B Gupta, Dennis J Jakiela: Non-yellowing para-tertiary-alkyl phenyl substituted triazine and pyrimidine ultraviolet light absorbers. Cytec Technology Corporation, Pennie & Edmonds, May 29, 2001: US06239276 (5 worldwide citation)

This invention relates generally to para-tertiary alkyl phenyl substituted pyrimidines and triazines and the use thereof to protect against degradation by environmental forces, inclusive of ultraviolet light, actinic radiation, oxidation, moisture, atmospheric pollutants and combinations thereof. Th ...


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Ram B Gupta, Dennis J Jakiela, Sampath Venimadhavan, Russell C Cappadona, Venkatrao K Pai: Process for making triazine UV absorbers using Lewis acids and reaction promoters. Cytec Technology, James A Jubinsky, Fran Wasserman, Claire M Schultz, November 26, 2002: US06486316 (4 worldwide citation)

It has been now surprisingly discovered after extensive research that 2-halo-4,6-bisaryl-1,3,5-triazine can be prepared with unprecedented selectivity, efficiency, mild conditions, and in high yield by the reaction of cyanuric halide with aromatics in the presence of at least one Lewis acid and at l ...


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Lawrence A Flood, Ram B Gupta, Revathi Iyengar, David A Ley, Vankatarao K Pai: Process for the preparation of 1,3,5-triazine carbamates from amino-1,3,5-triazines and organic carbonates. Cytec Technology, Bart E Lerman, Claire M Schultz, Michael J Kelly, January 6, 1998: US05705641 (3 worldwide citation)

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 cros ...