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.
翻译：本文的目的是利用专利水平特征来估计常住专利(向印度专利局(IPO)提出,并分配给印度的公司)的存续率。本研究报告使用了1995年1月1日和2005年12月31日应用、最终获准的公司级专利的更新信息。IPO提供的数据包括分配给266家公司(外国附属公司和国内公司)的2025年常住专利。生存分析是通过卡普兰-梅耶估计和考克斯比例风险回归进行的。本研究报告的结果表明,专利的存续率在很大程度上取决于其技术范围和发明人的规模。此外,与剩余公司的专利相比,享受税收优惠的公司专利的存续率较低。研究还发现,拥有DSIR附属关系的外国公司申请的专利正在从研发税收奖励政策中获得更多好处。
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