Is the US first to file or first to invent?

First-inventor-to-file, since the America Invents Act took effect for applications filed on or after 16 March 2013. Interference proceedings, which decided who invented first, were replaced by derivation proceedings, which ask whether the earlier filer took the invention from someone else.

Do lab notebooks still matter under first to file?

Yes, for different reasons than before. They no longer win priority contests, but they support derivation challenges, grace-period analysis, prior user rights, inventorship disputes between colleagues, and trade secret claims. Most engineering work is never filed at all, and for that work a dated record is the only evidence there is.

Can a timestamp beat someone else's patent filing?

No. Under first-inventor-to-file the earlier filing date generally wins, regardless of who conceived first. A dated record helps where the filing system does not reach — derivation, disclosure analysis, unfiled work, and copyright in the drawings, which is a separate right decided on anteriority.

First to File vs First to Invent

For most of the twentieth century the United States was alone in awarding patents to whoever invented first, rather than whoever filed first. That ended in 2013, and a lot of advice written before then is still circulating.

What changed

The America Invents Act moved the US to a first-inventor-to-file system for applications filed on or after 16 March 2013. Every other major jurisdiction was already first-to-file.

Under the old system, two applicants claiming the same invention could end up in an interference proceeding, where the question was who conceived it first and who was diligent in reducing it to practice. Laboratory notebooks — dated, signed, witnessed — existed largely for that proceeding.

Interferences are gone. If two people file for the same invention, the earlier filing date generally wins.

Why it is "first-inventor-to-file", not "first-to-file"

The wording matters. The US system is not purely first-to-file, and two features preserve some of the old thinking.

Derivation proceedings replaced interferences. If someone else filed first but derived the invention from you, you can challenge them. Establishing that requires evidence of what you had and when — the same kind of record notebooks used to provide.

The one-year grace period. An inventor's own disclosure within the year before filing does not count as prior art against them. Most jurisdictions have no such grace period, which is the single most consequential difference for anyone filing internationally.

What did not change: records still matter

The common conclusion after 2013 was that dated records had become pointless. That is wrong on at least four counts.

Situation	Why a dated record still matters
Derivation dispute	You must show what you had before the other filing
Grace period questions	What was disclosed, when, and by whom
Prior user rights	Some jurisdictions protect earlier commercial use
Trade secret claims	The alternative when you do not file at all
Copyright in drawings	A separate right, decided on anteriority
Inventorship disputes	Internal, between colleagues and employers

Most engineering output is never filed. For that work — the majority of it — no filing date exists, and the only evidence of when it existed is whatever record was kept.

The international asymmetry

Worth stating plainly because it costs people real money.

The US grace period gives you one year after your own disclosure to file. Most other jurisdictions have none. A public disclosure before filing destroys novelty in Europe and much of Asia, permanently.

So a trade show appearance, a published paper, a product launch or a detailed pitch before filing can leave the US route open while closing everything else. This is not something a record fixes — but a record of exactly what was disclosed and when is what the later analysis depends on.

What replaced the laboratory notebook

The notebook's function was a contemporaneous, hard-to-alter, dated record. The witnessed-and-signed convention existed because a notebook alone is only as good as its keeper.

Digital work has the same need and a weaker default. Files carry dates written by your own machine, and a version control history can be rewritten. See why metadata is not proof of a date.

A hash anchored in a public ledger does what the countersignature did: it moves the date outside the control of the person relying on it. Timestamp the design files, the calculations, the disclosure document — see design freeze records before filing for the workflow.

What a record will not do

Win a priority contest. Under first-inventor-to-file, the filing date decides, and no amount of evidence that you invented earlier changes that. Anyone selling timestamping as a way to beat someone else's application is describing a system that stopped existing in 2013.

What it does is preserve your position in the situations the filing system does not cover, which is most of them.

General information, not legal advice. Patent strategy is worth professional input.