with the development of the patent system, a higher criteria as to non-obviousness of 「ingenious sparkle」 was even raised.
随着逐步发展,甚至一度提出了「创造性天才的火花」这一更高的标準。
however, the 「non-obviousness」 standard did not end the uncertainty of patent law concerning inventive step, because the non-obviousness standard itself is 「non-obvious」.