Potential answers for "Inventor's safeguard"

⭐⭐⭐⭐ PATENT
⭐⭐ FIREWALL
⭐⭐ INSURE
⭐⭐ ENSURE
⭐⭐ SHIELD
⭐⭐ FIREDOOR
⭐⭐ NET
⭐⭐ ABMS
⭐⭐ APRON

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Last stop, of a sort   O'Connor's successor   Normal fig.