有。

the duration of patent protection即中文中所说的“专利保护期”。

如

A patent system providing such improvement patents in parallel with a relatively high level of inventive step could however possibly prevent the unjust extension of the duration of patent protection that sometimes results when separate patents for relatively minor improvements are allowed.

一个既涵盖改进专利又包括较高水平创造性的专利制度能够防止在允许为小幅 度改进单独授予专利的情况下可能发生的专利保护期的不公正延长。