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000048036 0247_ $$2doi$$a10.1016/j.wpi.2023.102179
000048036 035__ $$a(OCoLC)1284952498
000048036 040__ $$aSzGeWIPO$$beng$$erda$$cSzGeWIPO$$dCaBNVSL
000048036 041__ $$aeng
000048036 24500 $$aThe persistence of worthless patents? /
000048036 264_1 $$aOxford [England] :$$bElsevier Ltd.,$$c2023
000048036 300__ $$a1 volume.
000048036 337__ $$aunmediated$$bn$$2rdamedia
000048036 4901_ $$aWorld Patent Information,$$v72, March, 2023.
000048036 520__ $$aThe U.S. patent system requires owners to pay renewal fees at the four, eight, and twelve-year points of the patent's life of twenty years. Previous studies of renewal rates for patents granted over 1981–1991 and 2001–2004 show only around half of the patents were renewed by the twelfth year—leading some scholars to refer to this majority of patents as ‘worthless’. Much has changed in the world since patent renewal fees began in 1981, however. This paper investigates whether patent renewal rates changed correspondingly. Among those changes, the sheer volume of patents increased substantially, creating a challenge for collating patent data. A web scraper was coded to collect renewal rate data on 2.5 million utility patents issued from 1992 to 2009—the most recent patents for which twelve-year renewal rates are available. We find, somewhat surprisingly, that patent renewal rates are virtually unchanged from several years ago. We present and discuss related data, and present the underlying computer code that patent researchers may find useful for investigating a wide range of topics in the future.
000048036 542__ $$fhttps://www.sciencedirect.com/science/article/abs/pii/S0172219023000091
000048036 588__ $$aCrossref
000048036 590__ $$aPublished online: 11-Feb-23
000048036 650_0 $$aPatents.
000048036 7001_ $$aSchwall, Aaron,$$eauthor.
000048036 7001_ $$aWagner, Jeffrey,$$eauthor.
000048036 7730_ $$tWorld Patent Information$$wWPI
000048036 830_0 $$aWorld Patent Information,$$v72, March, 2023.
000048036 85641 $$uhttps://doi.org/10.1016/j.wpi.2023.102179$$yonline version
000048036 904__ $$aJournal article
000048036 980__ $$aWPI