What are the criteria for granting patent rights?

授予专利的标准是什么？

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。

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！