Headquartered in Kolkata, IP heavyweight DP Ahuja & Co is considered "one of the largest IP practices in the country" by market observers. A competitor notes the firm "is way up there in terms of volume of filing". Although the outfit provides the entire spectrum of IP services, peers and clients note that its strength is definitely in its prosecution work, "with its ranks of engineers being particularly strong," details a peer. The firm has been involved in the high-profile Enercon India patent matters before the Intellectual Property Appellate Board in the last year.