Wolfcastle wrote: "Perhaps a point to make is that there are many inventions, but only a select few of inventions are patentable inventions..."
This is accurate observation but I don't think it make much od a difference. The patentable inventions have to be lawful and legal, and most of the USC applies to patentable inventions and thus the legal ones.
Also if an invention, meets the criteria of novelty, usefulness and non-obviousness, but is not patentable only because it is illegal, such invention shall be patentable if someone finds legal use for it.
In this case, even if the invention was well know and described, just a lawful use alone would meet the criteria of a new best mode to practice the invention and thus make it patentable under the criteria of new use. Assuming, of course, that such a new-legal use is non-obvious.
Wolfcastle wrote: ".. A patent DOES NOT in any way give you a right to practice your invention..."
YOU COULDN'T BE FARTHER FROM TRUTH.
35 USC 204.
...no small business firm or nonprofit organization which receives title to any subject invention and no assignee of any such small business firm or nonprofit organization shall grant to any person the exclusive right to use or sell any subject invention in the United States unless such person agrees that any products embodying the subject invention or produced through the use of the subject invention will be manufactured substantially in the United States.
So at least under paragraph 204 an inventor or his/her assignee can grant an exclusive right to use (practice) and sell an invention in the USA if it is manufactured in the USA.
If an inventor didn't have such rights he/she obviously couldn't grant them, particularly on an exclusive basis.
Also if you read the rest of USC text carefully you will find many other explicit and implied exclusive rights granted to the inventor to use, sell and license the invention if so desired.