when did primus patent expire

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Primus XP was released on 11/08/2007 with the following highlights: The XP is patented until 2024. Primus XP has the addition of a new #7 fingerpin with a unique angle combined with a new pocke...
HIGH SECURITY Primus/Primus XP: In addition to six cuts for standard locking mechanism, there are five side finger pins to operate the secondary sidebar lock. Primus keys will operate non-Primus l...