## 4 Conclusions  
Corrosion affects the most varied sectors and directly impacts the economy of a country, especially industrialized and large oil and gas explorers. The need for means to reduce these impacts is evident and for this, science and technology are fundamental. The scientific and patent survey carried out in the present study recovered several documents  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Code** & **Inhibitor** & **IPC Classification** & **Country** & **Status** \\ \hline CN103194762 & Jatropha curcas seed & C23G-001/06 & China & Pending \\ \hline CN105140595 & Öeo essencial de lavanda (lavender oil) & H01M-012/06 & China & Concede \\ \hline CN113026023 & Taraxacum officinal & C23F-011/08 & China & Pending \\ \hline IN1608/DEL/2004 & \begin{tabular}{c} Lemon, castor oil, turmeric powder, mem \\ leaves, tulasi leaves, ladies finger, \\ gooseberry, grape and apple. \\ \end{tabular} & C23F-015/00 & India & Overdue \\ \hline IN201731006599 & Neem leaves, turmeric, coffee and tea & \begin{tabular}{c} A61K-008/02; \\ C23F-011/173 \\ \end{tabular} & India & Pending \\ \hline CN113201740 & Cocoa beans & \begin{tabular}{c} C07D-311/62; \\ C23G-001/06; \\ C23G-001/08 \\ \end{tabular} & China & Pending \\ \hline CN112981412 & Potentilla root powder & C23F-011/10 & China & Pending \\ \hline CN111850567 & Tea powder * & C23F-011/12 & China & Pending \\ \hline CN111705322 & Stevia plant leaves & \begin{tabular}{c} C23G-001/06; \\ C23G-001/08 \\ \end{tabular} & China & Pending \\ \hline CN112376038 & Basil leaf & \begin{tabular}{c} C23C-22/34; \\ C23C-022/60; \\ C23C-022/68; \\ C23F-011/173 \\ \end{tabular} & China & Pending \\ \hline CN113136198 & Green walnut shells & \begin{tabular}{c} C08H-007/00; \\ C09K-008/74; \\ E21B-043/27 \\ \end{tabular} & China & Pending \\ \hline CN109763120 & Kudingcha leaves & \
\begin{tabular}{c} C23C-022/60; \\ C23F-011/02 \\ \end{tabular} & China & Pending \\ \hline KR1007/8333 & Agar extract &
\begin{tabular}{c} C04B-014/02; \\ C04B-014/30; \\ C04B-016/02 \\ \end{tabular} & South Korea & Overdue \\ \hline \hline \end{tabular}  
* The document does not specify the plant used to obtain powdered tea.  
\end{table}
Table 5: Key information on patents recovered in Orbit for the group C descriptors.  
about the use of derivatives of plant extracts as green corrosion inhibitors and allowed drawing an overview.  
Most extracts are prepared from leaves, but the use of fruit peels, seeds, flowers and roots are also reported. Acid medium is the most tested corrosive environment and protection of carbon steel is the most researched. Excellent inhibition efficiencies were obtained at room temperature, with percentages above 80% for the corrosion rate. Results are associated with synergistic effect due to the presence of phytochemicals, known as nontoxic substances.  
The work of [PERSON] et al. (2014) [76] reported the various possibilities of using natural products from the Brazilian territory for \"non-biological\" applications, among them species containing polysaccharides, dyes and pigments, oils and other bioactive compounds. Researchers such as [PERSON] (2012) [24], point out these potentially useful compounds as \"green inhibitors\".  
The excellent performance of these extracts as corrosion inhibitors, the information gathered in the present study and the fact that this applicability was investigated only in the early 2000s, indicate that the exploitation of this area is on the rise and is very promising.