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The paper analyses the asymmetric volatility of patents related to pollution prevention and abatement (hereafter, anti-pollution) technologies registered in the USA. Ecological and pollution prevention technology patents have increased steadily over time, with the 1990's having been a period of intensive patenting of technologies related to the environment. The time-varying nature of the volatility of anti-pollution technology patents registered in the USA is examined using monthly data from the US Patent and Trademark Office for the period January 1975 to December 1999. Alternative symmetric and asymmetric volatility models, such as GARCH, GJR and EGARCH, are estimated and tested against each other using full sample and rolling windows estimation.

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Scientometrics
Authors: Jun Yuan, Wei Yue, Cheng Su, Zheng Wu, Zheng Ma, Yun Pan, Nan Ma, Zhi Hu, Fei Shi, Zheng Yu, and Yi Wu

Abstract  

This research intends to investigate the patent activity on water pollution and treatment in China (1985–2007), and then compares the results with patents data about Triadic patents, South Korea, Brazil and India over the same periods, patents data were collected from Derwent World Patents Index between 1985 and May 2008. For this study, 169,312 patents were chosen and examined. Total volume of patents, technology focus, assignee sector, priority date and the comparison with other countries are analyzed. It is found that patents on water pollution and treatment filed at China have experienced a remarkable increase and the increase rate of patents filed at China change simultaneous with the percentage of domestic applications. However, the number of high quality Triadic patents with priority country as China remains small. Furthermore, in addition to individual patent assignees, both Chinese universities and enterprises also play important roles in patent activity of water pollution and treatment. In addition, the pattern of South Korea’s development can provide short-term implications for China and the regularity in Triadic patents’ development can provide some guidance to China’s long-term development. In contrast, the development pattern of Brazil and India is less influential to China’s development. Furthermore, China’s technology focuses on water pollution and treatment seem to parallel global and triadic patent trends. This research provides a comprehensive picture of China’s innovation capability in the area of water pollution and treatment. It will help China’s local governments to improve their regional S&T capability and will provide support the National Water Pollution Control and Treatment Project in China.

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/66 Marine Pollution Bulletin 2.630 250 2.56 Environmental sciences; 39/181 Marine

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/59 Marine Pollution Bulletin 2.359 278 1.84 Environmental Sciences 51/193 Marine and Freshwater Biology 16

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. Prasad , G. Rupainwar , D. C. Singh , V. N. 1988 As(III) removal from aqueous solution by adsorption Water Air and Soil Pollution

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Scientometrics
Authors: N. Nikolic, J.-L. Baglinière, C. Rigaud, C. Gardes, M. L. Masquilier, and C. Taverny

; Belliard et al. 2009 ). Nevertheless, other human pressures such as overfishing, pollution, and climate change have and continue to affect most diadromous species. All the families of migratory fish, i.e., Salmonidae, Anguillidae, Petromyzontidae

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on the scales Hong, SM; Candelone, JP; Patterson, CC; Boutron, CF (1996) History of ancient copper smelting pollution during Roman and medieval times recorded in Greenland ice Stoll, HM (2006) Climate change—The Arctic tells its story Kunz, ML

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analysis of biosorption technology in water treatment research from 1991 to 2004 . International Journal of Environment and Pollution 34 1–4 1 – 13 10.1504/IJEP.2008.020778 . Ho , YS , McKay , G 2000

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records covering more than 37.2 million patent documents, with coverage from over 41 major patent issuing authorities worldwide; and (7) Pollution Abstracts contains almost 300,000 records on scientific research and government policies on pollution

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rather than SO 2 in Philadelphia 000083843000018 Mortality and air pollution: associations persist with continued advances in research methodology

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