Well my definition of ownership is different than yours, maybe we'd just go round and round on that. I usefully define ownership only by who has rights to buy, sell, or otherwise use the invention for purposes of commerce. Where you say 'ownership' I think 'creator' would be a better word. The creator can never change, but under the US system ownership easily can for IP.As I already noted you can not contractually forfeit all rights to your own patent or copyright. You will always possess ownership of it. You can only transfer rights. See my argument above.
AgreedAnd yes corporations are capable of owning copyrights and patents as you note from your link.
Disagree, I expect again on the definition of ownership vs creator.That does not mean that they can buy ownership of copyrights or patents.
Agree, depending on the employment agreement. Some companies allow employees to own and control patents outright.Generally a corporation owns a copyright or patent on the end product, the sum of the work of the individual creators that work for them.
Given the letter written by Jefferson late in his life, I am dissuaded for the moment from calling IP a natural right, but its unquestionably a legal property right (fictitious or otherwise) under the current US system for any usable, practical definition.