Patents:
Indian Patent:
1. Prem Kumar B., Ramagopal V. S. Uppaluri, De D. S., Purkait M. K., (2011). Surfactant Composition and Method for Enhanced Oil Recovery Using Aqueous Surfactant Composition, Indian Patent No. 245703 (Application No. 597/KOL/2007), granted 04/02/2011.