Environment Complete offers deep coverage in applicable areas of agriculture, ecosystem ecology, energy, renewable energy sources, natural resources, marine & freshwater science, geography, pollution & waste management, environmental technology, environmental law, public policy, social impacts, urban planning, and more. Environment Complete indexes more than 1,700 domestic and international titles (including full text for more than 680 journals) as well as more than 120 monographs.
Originally combined data from the Handbook of Organic Chemistry, the Gmelin Handbook of Inorganic and Organometallic Chemistry, and the Patent Chemistry Database and is now updated directly from the source literature.
Patents are available via many search engines.
An excellent video from University of Central Florida shows how to use CPC (classification) codes to do a more accurate patent search.