1. Group 4 metal aryloxy compounds as bulk polymerization catalysts for lactide polymerization, (Indian Patent Application No:2550/CHE/2010 )
Ravikumar R. Gowda, Debashis Chakraborty and Venkatachalam Ramkumar.

2. Group 4 metal aryloxy compounds..(Indian Patent Application No:1376/CHE/2011)
Ravikumar R. Gowda, Debashis Chakraborty and Venkatachalam Ramkumar.

3. Metal free catalysts for the ring-opening polymerization of cyclic esters and lactide.(Indian Patent Application No:under progress)
Debashis Chakraborty, Payal Malik, Ravikumar R. Gowda and Venkatachalam Ramkumar.

4. Imino(phenoxy) alane: A High Mileage Catalyst for PLA Synthesis ( Patent Application in Progress).
Debashis Chakraborty, Swarup Ghosh, Venkatachalam Ramkumar

5. Catalyst for poly (lactide) synthesis and uses thereof
D Chakraborty, S Ghosh, Venkatachalam Ramkumar
US Patent App. 14/781,016