Generally, the period of finally granted invention patents is also relatively long, mostly 2-3 years. The general audit process is to send a notice of preliminary examination in about three months and a notice of preliminary examination in six months. It takes about one and a half years to issue the first notice of examination opinions, and the patent certificate can be obtained in about two years. The technical field of invention patents is wider, and the review period of different technical fields is quite different. Some technical fields may be faster than 1 year, and some technical fields are slower, taking 3 years or even longer.
Generally, it takes a long time to apply for an invention patent, but there are also several fast channels, which can more than double the closing period. Experts who can consult the platform online.