Consider this:
On the USPTO site you can find Patent Assignment Abstract of Title (for 336). If you follow the chain you will see 11/26/2003
Assignor: Moore reel/frame: 014178/0319
Assignee: TPL
Then on 3/20/2009
Assignor: Moore reel/frame: 022440/0445
Assignee: Moore Trust
It could be nothing other than Moore assigning what he owns to his trust. Or, could it mean that TPL no longer owns anything and Moore is now transferring 1/2 to the trust. These documents can be ordered via e-mail for $25 (each reel/frame)