Why is there no destroyer floor drain? The inner core is patented, which has better deodorization and drainage, but the price is almost the same if you buy a lifetime warranty once.

1. One of the reasons why patent rights are limited in time is that patent rights are not unlimited rights, and rights have boundaries. The protection period of China's invention, utility model and design patents is 20 years from the date of filing and 10 years respectively. The system of patent right is "publicity in exchange for protection", that is, the patentee publicizes his patented technical scheme in order to obtain monopoly rights, implementation rights, disposal rights and income rights within a certain period of time. Lincoln's famous saying: the patent system is to pour the oil of interest on the fire of genius. The state sets a certain period of protection for patent rights, which aims at balancing the interests of patentees and the public, protecting intellectual property rights, preventing knockoffs, encouraging technological innovation and promoting scientific and technological progress.

2. The second reason that the patent right is limited in time is to encourage the patented technology to be implemented as soon as possible. Science and technology are the primary productive forces, and patents make profits through implementation, which also benefits the society and promotes economic development. If the patentee never implements his patented technology or licenses it to other people or enterprises in need, it is a waste of social resources. The compulsory licensing system stipulated in the patent law is also to promote the implementation of patents. The patentee should not sleep on his rights, but should actively exercise his rights.

3. The third reason why the patent right is limited in time is to ensure fair competition and promote the enjoyment of technology. After the expiration of the patent protection period, the patent becomes invalid and becomes a well-known public technology. Anyone or enterprise can implement expired patents free of charge, which is conducive to promoting the enjoyment of technology. It is precisely because patents will be invalid, so it is necessary to constantly carry out technological innovation in order to maintain an advantage in market competition, otherwise the temporary patent quantity or quality advantage will be surpassed by competitors sooner or later, which is conducive to creating a fair and healthy market competition environment, which is essentially equivalent to maintaining social fairness and justice.