I wouldn't hold my breath waiting for the US to change to a first-to-file system. Unlike most countries, which establish a patent and copyright system purely by legislation, the US system has it's basis in the Constitution, which allows for monopolies to be granted to "inventors". Not "people who file the forms first". To get rid of first-to-invent, you'd have to amend the Constitution, which I just don't see happening any time soon, for such a low-profile issue.
Any attempt to bring in first-to-file by means of law or regulation will almost certainly be imediately challenged on this basis by several inventors, or inventor associations.
It'll take a while, but it'll come, especially now that the American Bar Association is behind the adoption of first-to-file. The ABA was, for a long time, one of the staunchest defenders of first-to-invent, largely because so many lawyers made so much money out of "interference", the bizarre (and extremely costly) procedure of determining who has the right to which part of which invention in the case of overlapping subject-matter. And I think that more and more inventor associations are coming to see the inherent practical advantages of first-to-file.
The "inventor" problem is easily fixed by changing the definition of "inventor" in the patent legislation itself. The Constitution (which nowhere defines "inventor") need not be touched. The development of "first-to-invent" and all its attendant baggage arose in the context of the patent laws and the practice that developed with them. No more conception! No more reduction to practice!! No more due diligence!!! I can hardly wait...
P.S. To show you how imprecise the Constitution is on these matters; here's Article 8:
The Congress shall have Power To lay and collect Taxes, Duties, Imposts and Excises, to pay the Debts and provide for the common Defence and general Welfare of the United States; but all Duties, Imposts and Excises shall be uniform throughout the United States;
.... To promote the Progress of Science and useful Arts, by securing for limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries;
The funny thing is that you can't patent a "discovery", and you haven't ever been able to! A "discovery" is something like the photoelectric effect; you can't have a monopoly on what is in effect a law of the universe, but you can patent a practical embodiment, such as an automatic door-opener operated by breaking a light beam. With language that vague and open to interpretation, it's no sweat to redefine "inventor".
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