  The purpose of this paper is to use patent level characteristics to estimate
the survival of resident patents (filed at the Indian Patent Office (IPO) and
assigned to firms in India). This study uses the renewal information of
firm-level patents applied during 1st January 1995 and 31st December 2005,
which were eventually granted. The data provided by IPO consists of 2025
resident patents assigned to 266 firms (foreign subsidiary firms and domestic
firms). The survival analysis is carried out via Kaplan-Meier estimation and
Cox proportional hazard regression. The outcomes of this study suggest that the
survival length of patents significantly depends on their technological scope
and inventor size. Moreover, the patents of the firms taking tax credit
benefits exhibit lower survival rate as compared to patents of remaining firms.
The study also finds that the patents filed by foreign firms with DSIR
affiliation are getting more benefit from the R&D tax incentive policy.
