The growing concern regarding environmental issues is mainly related to the fact that natural resources are limited, and the environment is unable to absorb the current amount of generated waste. The construction industry is recognized as one of the sectors that consume the most natural resources and generates waste. A problem resulting from urbanization is the alteration of the natural hydrological cycle, due to an increase in the rate of soil waterproofing, resulting in an increase in the volume and constancy of the floods. The production and publication of knowledge are essential for the development of research, however, studies directed at the feasibility of applying and commercializing this knowledge are insufficient. The patent information serves as a source to map the technological prospecting, presenting relevant information to the application of the invention with the purpose of commercialization. This study applied a survey of patent information about permeable pavement using construction and demolition waste (CDW) as an alternative raw material. The authors conducted an exploratory study based on a survey of existing patents in international databases, through Google Patents, EPO (Espacenet), and WIPO (Patentscope), verifying the degree of technological development, holders of inventions, and potential markets. We used the terms "construction and demolition waste", "pavement" and "paving" to obtain the patent results. As a result, 65 patents were filed, highlighting as depositing countries, the dominance of the United States, Brazil, Japan, and China. The knowledge contained in patents can collaborate to make decisions related to sustainability in the civil construction sector.

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Civil construction is one of the most important sectors for economic and social development, alternatively, it is a generator of waste that is commonly discarded in an irregular manner causing negative environmental impacts. Seeking knowledge in databases for innovation has become a common practice in most organizations in the development of new products, due to the evolution of information technology. Patent data shows changes in the structure and development of a country's creative activities in technologies, industry, and companies. Analyzing the competitiveness between inventors and companies is feasible as patents contain descriptions of inventions and their functionalities. This study aims to collect patent information on mortars using construction and demolition waste (CDW) as an alternative raw material. We performed the research in an exploratory way with the purpose of defining more viable technological routes, determining the types of materials to be used, and the minimum and maximum percentages of substitution of the natural aggregate for the recycled aggregate. We used the patent databases Google Patents, European Patent Office (EPO) through Epacenet, and World Intellectual Property Organization (WIPO) available on Patentscope. As a result, 70 patent application records were identified according to the search descriptors, with Brazil as the country with the highest number of registrations. A survey of the number of patents deposited, published, office, and/or country was performed following the International Patent Classification. The results have the potential to contribute to the design of improvement strategies when using construction and demolition residues in mortars.