Bhattacharya, Sujit; Moh'd Taiyab Rashid Khan - In: Research Evaluation 10 (2001) 1, pp. 33-45
The trends and directions of an important area, thin film technology, is explored through analysis of US patents, comparing activity in 1989, 1993 and 1997, and 1993–1997 in detail. A classification system for all the patents in our data set under technological sector(s) and subsector(s) helps...