hank you for your inquiry.
It is taking a time to check the records because we think
this design is standard one for QFN.
Could you advise us the back ground of this inquiry ?
Is it a patent issue ?
According to one patent journal (issued on 1999 in Japan),
this corner lead design was already described on it.
It means this design had been known as QFN corner lead
in 1999.
Isn’t it helpful information for you ?