Applying patent survival analysis in the academic context

Lewensohn, Danielle; Dahlborg, Charlotta; Kowalski, Jan; Lundin, Per

doi:10.1093/reseval/rvu037

Cited by 5 publications

(9 citation statements)

References 57 publications

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“…Identifying the determinants of the length of time it takes for a patent to be granted has typically employed conventional survival analysis techniques in the absence of competing risks. This approach estimates survival and hazard functions and quantifies how covariates affect the hazard of the rate of occurrence of patents granted over time (e.g., Harhoff & Wagner, 2009;Lewensohn et al, 2015;Nakata & Zhang, 2012;Nikzad, 2011;Popp et al, 2004;Regibeau & Rockett, 2008;Xie & Giles, 2011;Yang, 2007). Popp et al (2004), focusing on utility patents granted to applicants in the United States between 1976 and 1996, found the grant lag was influenced by the technology field, with complex technologies, such as computers or biotechnology, taking longer to be granted than other patent applications.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Patent characteristics in the relevant literature have been extensive ranging from the technology field (e.g., biotechnology), patent family size, number of claims, forward and backward citations, and number of International Patent Classification classes (Harhoff & Wagner, 2009;Nikzad, 2011;Popp et al, 2004;Xie & Giles, 2011). One limitation of conventional survival analysis methods is that they have ignored or treated nongranted patents or competing events as censored data (Lewensohn et al, 2015), which are likely to bias the probability of the event's occurrence or its association with covariates. Competing events, such as patent applications withdrawn or abandoned, preclude the occurrence of patents turning into valid patent rights, and should be considered in the analysis rather than being discarded or ignored (van Zeebroeck, 2011).…”

Section: Literature Reviewmentioning

confidence: 99%

“…Previous studies (e.g., Lewensohn, Dahlborg, Kowalski, & Lundin, 2015; Nikzad, 2011; Popp et al., 2004; Svensson, 2013; Xie & Giles, 2011) have employed nonparametric (e.g., Kaplan–Meier [KM] method) and semiparametric methods (e.g., Cox proportional hazards model) to model, respectively, survivor and hazard functions. The latter analyses how covariates affect the hazard of occurrence of patents granted over time.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Determinants of the grant lag and the surrender lag of horticultural crop plant breeders’ rights applications: Survival analysis with competing risks

Meng

Carew

Florkowski

2020

Canadian J Agri Economics

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Obtaining a Plant Breeders' Rights (PBR) certificate provides horticultural institutions the exclusive right to produce and reproduce new varieties, which directly motivate new plant variety innovations. This study investigates how the grant and surrender lag of PBR certificates is influenced by the crop type and applicant characteristics using the Canadian Food Inspection Agency horticultural crop PBR application data for the period 1992-2014. Results from the Fine and Gray subdistribution hazard model reveal that the grant lag and surrender lag of Canadian PBR applications significantly vary by the country of origin of the applicant, whether the applicant is a public institution or private company/individual, horticultural crop types, and the decades when applications are filed. The policy implications of the results provide useful information to stakeholders of the Canadian Plant Breeders' Rights System regarding how the lifespan of PBRs is influenced by crop type and applicant characteristics.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Determinants of the grant lag and the surrender lag of horticultural crop plant breeders’ rights applications: Survival analysis with competing risks

Meng

Carew

Florkowski

2020

Canadian J Agri Economics

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“…Moreover, its scope in applications has been extended to technology management. Lewensohn et al [58] conducted a survival analysis of academic patents to discover that the life of a patent is related to the patent, the inventor, and the assignee characteristics. Tsang et al [59] conducted a survival analysis to examine a firm's decision making with regard to patent renewal based on fuel-cell patents.…”

Section: Survival Analysis and Topic Emergencementioning

confidence: 99%

Identifying Emerging Trends of Financial Business Method Patents

Lee

Sohn

2017

Sustainability

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Financial technology has become an important part of the banking industry in recent times. This study attempts to propose a framework to identify emerging areas and trends using financial business method patents. Based on the abstracts of financial business method patents registered at the United States Patent and Trademark Office, this study first applies latent Dirichlet allocation to identify emerging topics. The probability of the annual occurrence of each topic is adjusted through the exponentially weighted moving average to reflect the importance of the recent probability of topics. Each topic is classified as "hot" or "cold" depending on whether the exponentially weighted moving average of the probabilities exceeds the threshold. We applied survival analysis to the time gap of recurrently becoming hot from a cold status with the associated factor of financial business method patents. The findings suggest that the topic with the short granted period and high forward citation is likely to become hot. In addition, the topic that is aged and specific in narrow areas is likely to continuously change into the hot or cold status. The approach proposed in this study contributes toward understanding topic emergence in the financial area and pursuing sustainable development.

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“…Therefore, conventional regression analysis was inapplicable for this study [20]. Finally, although survival analysis has been applied in previous studies to investigate patent maintenance time [21][22][23][24], nearly no study has implemented a survival analysis to explore the characteristics of patents during their approval processes and their statuses after their approval, such as of being assigned and litigated, as well as considered the sizes and types of assignees. This study incorporated a survival analysis to such an effect.…”

Section: Introductionmentioning

confidence: 99%

The lifespan of semiconductor patents by assignee and patent characteristics

Chang

Fan

2017

MATEC Web Conf.

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Abstract.Evaluating the values of patents is critical for both managers and investors. Patent maintenance time is an ideal proxy indicator for evaluating commercial patent value. This study investigated the survival rates of patents in the semiconductor industry by using a survival analysis and incorporated a predictive model for patent maintenance times. The technical characteristics of the patents, the assignee factors, and the statuses of the patents were used as the predictive factors for patent maintenance time. The results revealed a small entity size and the number of assignees are the risk factors that increase the likelihood of the maintenance time of a patent decreasing. The litigation status of a patent and the number of its international patent classifications, claims, forward citations, and assignments were determined to be the protection factors that raise the likelihood of its maintenance time extending. Additionally, substantial differences were noted between small entities and nonsmall entities and between being litigated and not in their effects on the survival rates of patents. This study examined the factors that affect the survival rates of patents and provides a reference for the managers and investors of intellectual property rights to use when assessing technical and commercial patent values.

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Applying patent survival analysis in the academic context

Cited by 5 publications

References 57 publications

Determinants of the grant lag and the surrender lag of horticultural crop plant breeders’ rights applications: Survival analysis with competing risks

Determinants of the grant lag and the surrender lag of horticultural crop plant breeders’ rights applications: Survival analysis with competing risks

Identifying Emerging Trends of Financial Business Method Patents

The lifespan of semiconductor patents by assignee and patent characteristics

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