Dispatch ESSAY June 15, 2026 1 MIN READ BY PRAVEEN LAVU

A conception-evidence matrix for solo inventors

Most solo inventors misunderstand first-to-file the same way: they think the clock starts when they had the idea. It doesn't. Under the AIA, the clock that matters is when you file.

Under first-to-file patent law, filing date matters, not conception date, except in narrow derivation proceedings where you must prove you conceived first and communicated it to someone who later filed. A simple matrix tool tracking timestamped artifacts against claim elements helps solo inventors build the corroborated evidence trail needed to win a derivation challenge.

Key takeaways

Derivation proceedings remain a real but narrow window where conception evidence matters: you need corroborated, timestamped proof that you conceived the invention and communicated it to someone who filed before you.
Solo inventors should maintain a dated digital trail of development artifacts (git commits, emails, PDFs with metadata) mapped against their eventual claim elements rather than reconstructing evidence after deciding to file.
Patent documentation works best as a builder's habit during development, not as a legal afterthought—treating it like lab notebook discipline applied to digital artifacts prevents the common failure of having undated artifacts when filing time arrives.

That doesn't make conception evidence worthless. One narrow scenario still cuts: derivation proceedings under 35 U.S.C. §135. If someone files before you and their invention traces back to yours (a conversation, a shared draft, a disclosed prototype), you can challenge that filing. To prevail, you need corroborated, timestamped evidence that you conceived first and communicated it to them. Not "I thought of it first." Communicated. Corroborated. Timestamped.

The old interference battle is gone. That narrow but real window isn't.

The tool I use is a matrix. Embarrassingly simple. Rows are timestamped artifacts: git commits, dated emails, PDFs with intact metadata. Columns are the claim elements I'll eventually care about. Each cell answers one question: does this artifact demonstrate this element?

Filling it in forces a clarity that post-hoc reconstruction never does. And post-hoc reconstruction is the failure mode I see constantly: inventors pulling artifacts together after they decide to file, discovering nothing is dated cleanly. Classic lab-notebook discipline, applied to a digital trail nobody thought to maintain.

The matrix is the first move in a longer thesis I'm working through: the patent journal as a builder's habit, not a lawyer's afterthought. More on that.

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