Patent illegality

The judgment in Associate Builders v. DDA, (2015) 3 SCC 49 examined each of the heads set out in Renusagar Power Co. Ltd. v. General Electric Co., 1994 Supp (1) SCC 644, together with the addition of the fourth head of “patent illegality” laid down in ONGC Ltd. v. Saw Pipes Ltd., (2003) 5 SCC 705. Since we are concerned with the “perversity principle”