A Theory of Knowledge Growth by Gianluca Carnabuci

By Gianluca Carnabuci

Why do convinced domain names of human wisdom increase speedier than others? This thesis units out to respond to this question via elaborating upon the inspiration that new principles spring from hybridizations of current rules. over the years, such hybridizations shape a path-dependent community constitution of interconnected and interconnecting wisdom domain names. This thesis develops a network-analytic method of version this constitution and to enquire its results. in keeping with all technological wisdom patented within the usa among 1975 and 1999, this thesis demonstrates that the community place a data area is embedded in at a given cut-off date impacts its next development customers in very important and predictable methods.

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I. 1 shows the knowledge hybridization network between 1975 and 1999. 4 represent the same network without the weakest 5%, 10%, and 15% ties, respectively3. As it appears, under a pervasive surface of weak ties, the network backbone consists of a multiplicity of relatively welldefined hybridization clusters. 4 reports next to each node the corresponding USPTO patent class numbers4. Beginning from the Southwest region, a well-defined subgroup of domains cluster around patent class 428, denoted Stock material.

Generally, the term of a patent right is 20 years from the date on which the application for the patent is filed, subject to the payment of maintenance fees2. In return for the temporary legal monopoly conferred by a patent, the applicant must make full disclosure of the patented invention. S. Code, Title 35, Part II, Chapter 10, Section 112). Hence, patents fall squarely into the category of public knowledge described in Chapter 1. Applications filed to the US Patent and Trademark Office are assigned for examination to the respective examining groups in charge of the domain of technological knowledge the invention pertains to.

Hence, most patents receive few or no citations, while disproportionably few patents receive thousands of citations. This reflects the uneven knowledge contribution of individual patents, an issue I discussed in Chapter 2. nineties had not yet been granted before the end of 1999. 6 Mean citations made and received by application year Source: adapted from Hall et al. 8 Mean citations made by technological area and application year Source: adapted from Hall et al. 9 show, respectively, the average number of citations made and received by technological categories.

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