1. What you mentioned are some foreign patents, so before searching, you need to determine which country the patent belongs to, and then go to the patent office website of this country to check (specific patent websites of each country) ?You only need to enter on Baidu: national patent websites? and it will come out); if it is a design patent, and you see that the patent has been announced in that country, it means that it has been authorized; for other patent types, it has You can know whether it is authorized without the authorization instructions

2. If the patent you want to know is a PCT foreign patent, it is easier to find it. You only need to go to the World Intellectual Property Organization (WIPO) website to check http://www.wipo.int/  This is the full English version. You need to click to enter the "PATENTS" window, then enter the "Search Service" window, and then enter the relevant information of the patent to query , for example, enter a patent number, and then the patent information will come out

3. As for how to judge whether it is authorized, you have to see whether it has an international search report (Later?publication?of?international?search? report?)

4. Here I checked a patent for you?WO/2008/064360?The details are as follows: Applicant:?ZHANG,?Yinzhi?[CN/US];?(US) ?(US?Only)?.?Zhang, Yinzhi?[Chinese/US](US)(US only). ?

ZHOU, ?Qunhui?[CN/US];?(US)?(US?Only)?.?Zhou Qunhui?[China/US] (United States) (United States only). ?

NELSON?Jr.,?Sidney?[US/US];?(US)?(US?Only)?.?Nelson Jr., Sidney?[US/US](US)(US)(US) (U.S. only). ?

SORBENT?TECHNOLOGIES?CORPORATION?[US/US];?1664?East?Highland?Road,?Twinsburg,?Ohio?44087?(US)?(All?Except?US)?. ?Desulfurization Technology Corporation?[US/US]?1664 East Highland, Twinsburg, Ohio 44087 (USA)

Inventor: ?ZHANG,?Yinzhi?;?(US).?Zhang Yinzhi ?;(U.S). ?

ZHOU, Qunhui (US). Zhou Qunhui (US). ?

NELSON Jr., Sidney (US). Nelson Jr., Sidney, (US). ?

International filing date: 23.11.2007 23.11.2007

Publication date: 29.05.2008 May 29, 2008