22 Apr
2014
22 Apr
'14
8:26 a.m.
... turns 20 today. This is the patent which covers hsrp, vrrp, many applications of carp and some other vendor-specific standby protocols. Assuming no term adjustments, 20 years is the normal term for US patents so unless there's been any adjustments / continuations, probably this patent is now expired. More details on: https://www.google.com/patents/US5473599 Nick