How do I know which patents are used in products (such as digital cameras and printers)?

Because the patent application must be single, it is difficult to find out which patents are used in specific products unless someone in the enterprise leaks trade secrets to you; In other words, he is a master of patent retrieval and an authority on products.

First, search widely. How many patent documents about cameras or printers can you search for? This is incomplete, because some patent names do not include cameras or printers. Time is less than an hour.

Method 2: Search one by one. First of all, we should know which parts are included in the searched products, and it will take about three to five months to search one by one through the international classification numbers of these parts.