2. Wrong, the papers published in periodicals constitute the existing technology, and the invention is not novel.
Wrong, the period of patent right is calculated from the date of application.
4. Wrong, the content of the patent information granted the patent right was novel before the application date, but not necessarily after that.
5. That's right. The number after 1998 is 2, which is a practical model.
6. It may be right or wrong, but the patent is independent, the patent right is terminated, and everyone can use it for free; However, when the patent is an improvement of other basic patents, although the patent right of the patent has been terminated, your use of the technology will infringe the patent right of the basic patent and you can't use it for free.
7. Wrong, the patent content of the same family may be somewhat different.