工业和企业家经常寻找技术解决的技术问题，或启动一个新的业务. 据说技术是要付出代价的，没有什么是free.This声明虽然在某些情况下，真正的, 并不适用于所有情况. 本文将讨论获得有价值的技术的方式，而不支付任何费用的技术, 许可或专利费.
要理解这个问题, 有必要知道该专利系统的工作原理. Firstly a patent is granted for a product, 组成, 装置或设备, 流程ofmanufacture, 甚至使用, 如果题材小说, not obvious to a person skilled in the field of technology and is industrially applicable. The Patent office which receives and examines the patent applications ensures that the applications meet with these criteria. In addition the patent laws of most countries require that the inventor disclose “the best mode of the invention” such that a person skilled in the art would be able to reproduce the invention, just by practising the teachings disclosed in the patent document together with common general knowledge in that field of technology, 没有做任何进一步的研究. 还有什么可问? An organic chemist reading a patent on an organic chemical compound should be able to produce the chemical compound disclosed and claimed in chemical patent using his common general knowledge (作为众所周知的化学家) 没有做进一步的研究.
说了同样的制造商, injection moulding machines should be able to reproduce any improvements to injection moulding machines disclosed and claimed in a patent relating to the latter machine without further research (although minor experimenting or workshop trials may be required).
其次, 专利的寿命是有限的. The patents of most countries last for a maximum of 20 年内申请的专利申请的日期. However most patents are not maintained for that period of time – the granted patents are allowed to lapse for non-payment of annuity fees. 一旦专利已过期, 该technologydisclosed其中提供给全世界免费. No consent or license is required to commercially exploit the technology disclosed.
[可能有其他的存续权, 如工业设计权, 版权, 需要清除etc.which].
第三, most patent offices now publish the patent application in full eighteen months after filing even though a patent has not been granted. Many of the published patent applications are not prosecuted to grant. The technology disclosed in the published patent application is donated to mankind, if no patent is granted on the patent application……