In addition, within the validity period of the patent, if the patent forgets to renew the fee, it can be regarded as giving up after a certain period of time.
Priority number: US1996071599219960919; us 19940 186232 19940 125； us 19920870360 199204 17； us 199006 10339 1990 1 105； Us198902946119890106 These are priority documents, and the priority date is the earliest one in this pile.