Does a recorded lease have to be canceled at the clerks office like a mortgage must be if it's no longer valid?
A mortgage note (original) that has passed it's final paid off term date or has been satisfied will cloud a title if it isn't officially canceled.
Would it be the same for an expired lease that hasn't been canceled?
The articles of the Louisiana Mineral Code that apply to your questions are Articles 206 through 209. Should you send a demand letter for release and the last owner of record fail to respond to your demand letter, he will be subject to the penalties set out in these particular articles.
As a side note, more often than not, companies fail to file of record a release of expired or terminated leases. However, more often than not, they will respond favorably to a demand for release from a Lessor whose lease is no longer in effect. Remeber to send your demand letter via certified mail so that the operator cannot claim that they never received your demand for release.
How would I determine who is the last owner of record? I'm talking about a lease that would have expired in 1956 in far north Shreveport? covers part of T18,T19 R14 & several sections. Do not think there was ever any royalties.