## 3 Results and Discussion
Other examples of depositing countries in Brazil are Denmark, the United States, and Germany. In analyzing the main dominant areas to which the prospected technology is directed (Figure 5), the three main categories were selected (among 20 found) according to the percentage of development by the main applicants (TSO3 Inc., Quebec, QC, Canada). The technologies were: (a) tissue, scaffold, hydrogel, implant, medical, dressing, collagen; (b) container, packaging, beverage, shipping, pallet, lid, bag; (c) packaging, bag, container, wrapping, filling, blister, packing. Technologies (a) and (b) were found in 94% of the patent documents. High percentages of the technologies of interest demonstrate technological saturation in this area, while small percentages point to diverse technological representation. This same year presented itself as the most significant in relation to technological diversity, with over 63% representation of all found technologies. Of TSO3 Inc. patent applications, 81% refer to main technology (a). According to database analysis, this technology presented a peak in 2018 with an average of three registers per year. Concerning other applicants, all documents (100%) of Renosem Co. Ltd. and Xenex Disinfection Services LCC are in this technological area, while SoClean Inc. had the lowest percentage (22%). Analyzing technology (b), only TSO3 Inc. had patent applications in this area, but only 10% corresponded to this technology. Lastly, in relation to technology (c), the representativity of TSO3 Inc. loses space to Vanrx Pharmasystems Inc., with the highest percentage of applications in this area (36%). In the evaluation of classifications through CPC codes found in the documents (Figure 6), two of the codes used in the prospection (A61L2/202--ozone (gas); A61L2202/122--chambers for sterilization) were the most found, displaying a total of 501 and 493 records, respectively. The third most-used code (A61L2202/14) is specific to means to control sterilization processes, data processing, presentation and storage means, being present in 354 records. Code A61L2202/24 (medical instruments, e.g., endoscopes, catheters, perforators) was the fourth most-used in 328 records. The presence of these codes demonstrates that the disinfection of surfaces and instruments is being protected in the great majority of documents. Table 6 shows the description of the CPC codes in the records. \begin{table}
\begin{tabular}{c c} \hline
**CPC Code** & **Related To** \\ \hline A61L2/202 & Ozone (gas) \\ A61L 2202/122 & Chambers for sterilization \\ A61L 2202/14 & Means for controlling sterilization processes, data processing, presentation and storage means, e.g., sensors, controllers, programs \\ A61L 2202/24 & Medical instruments, e.g., endoscopes, catheters, sharps \\ A61L 2/24 & Apparatus using programmed or automatic operation \\ A61L 2/208 & Hydrogen peroxide \\ A61L 2/14 & Plasma, i.e., ionized gases \\ A 61L 2/20 & Gaseous substances, e.g., vapors \\ A61L 2202/15 & Biocide distribution means, e.g., nozzles, pumps, manifolds, fans, \\  & baffles, sprayers \\ A61L 2202/13 & Biocide decomposition means, e.g., catalysts, sorbent \\ \hline \end{tabular}
\end{table} 
Table 6: CPC codes in technological prospecting. Figure 5: Analysis of top technological areas related to patent documents referring to disinfection chambers using O3(g) or O3(aq). Comparisons between top filing company TSO3 Inc. and other companies were performed for three types of technologies. (red) Technology (**a**) highlighting number of patents applications by TSO3 Inc. (161), center of the donut chart. Percentage values of other companies (also in red) compared to this number shown in the smaller donut charts below. Other colors are related to other, not shown technologies. Same analysis was applied to technologies (**b,c**). Surprisingly, the other code used in the search strategy (A61L2/183--ozone dissolved in liquid), was not among the 10 most used codes.