Patent license contract, there are five main classes: 
 (1) ordinary license 
 The common implementation of the license is the licensor (the patentee) patented technology can be many times permit others to use the license trade. According to this license the patent, in addition to allowing the licensee to exploit the patent, can also allow third parties to use its patents, the patentee retained the right to use its patent. The approach has the advantage of such a permit is conducive to the promotion and application of the patented technology, but if ill-considered patentee, the patent administrative department mismanagement, there is no limit to sign such a license contract will lead to the overproduction of the patented product, affect the patentee and the licensee's interests. 
 (2) exclusive licensing 
 Exclusive license to the licensee within a certain time and geographical limits, have an exclusive right to use the patented technology of the licensee and the licensee is the only use of the patented technology, the licensor (the patentee) and any third party shall at the same time and within the geographical scope of patents. Such permission, the patent holder the patented technology can obtain a higher fee, but also shackled hands and feet of the patents themselves, so in practice, this license is less. 
 (3) non-exclusive license 
 According to this non-exclusive licensing, the licensor and the licensee the right to use patented technology, the licensee shall not allow third parties to exploit the patent. Licensor and the licensee jointly market share, through the implementation of the patented technology, the economic benefits. 
 (4) sub-licensing 
 Licensing, the patentee as a licensor allows the licensee to use its patents, in accordance with the contract, the licensee can also patent license to a third party, relative to the original license contract, which is sub implementation licensing contracts. Under this license, the patentee can be part of the commission received from sub-license contract. 
 (5) cross-licensing 
 Cross-licensing refers to the simultaneous presence of two patents, patent cross-license each other to implement their own patents. Specific interests of how to share, in the form of the contract agreed by both parties.