What are the criteria for granting patent rights?

授予专利的标准是什么？

How long is the duration of patent right for an invention according to the law?

根据这个法律．发明专利权的期限是多久？

This is only for one of the patent rights. For invention the duration of protection is even shorter, only for 5 years protection.

只有一种专利权保护期限是15年，发明专利保护期限是15年。至于实用新型和外观设计专利，保护期更短，只有5年。

No, 15-year protection is the minimum protection any country will grant its patentees. In some countries, the patent right duration for invention is 20 years.

不是，各国都对专利人给予了最低15年的专利保护。在一些国家，发明专利的保护期是20年。

Even after Alexander Graham Bell and his associates had completely demonstrated its usefulness, the Western Union Telegraph Company refused to purchase all their patent rights for $100,000!

即使在 Alexander Graham Bell 及其同伙完全证明了它的实用性之后， 西联电报公司仍拒绝以 100,000 美元购买其所有专利权！