evergreening

evergreening
 n.— «The Government will consider ditching amendments to the agreement, forced by Labor last year, which stop drug companies from artificially extending their patents to boost their earnings. The practice, known as “evergreening,” is common in the US.» —“Drug price alert on trade pact” by David Wroe in Canberra The Age (Melbourne, Australia) Jan. 4, 2006. (source: Double-Tongued Dictionary)