Patent or Trade Secret: File First, Disclose Later
If you actually have real tech, you face a choice: file a patent, or keep it as a trade secret. The two paths run on opposite logic—pick wrong and it costs you. Even worse is the order problem: ship the product before you file, and that patent can never be filed.
Patent: protection in exchange for disclosure
Fully disclose the technical solution to the public, in exchange for a statutory exclusivity window: invention patent 20 years, utility model 10 years, design patent 15 years, all counted from the filing date. During that term, anyone else needs your consent; after it expires, the solution enters the public domain.
Trade secret: protection in exchange for secrecy
Disclose nothing; protect the core know-how with strict secrecy measures. If you can keep it, it lasts indefinitely—Coca-Cola’s formula held for over a century is the extreme case. The cost: once leaked or independently recreated, protection is gone.
An invention or utility model for which a patent right is to be granted shall possess novelty, inventiveness, and practical applicability. Novelty means that the invention or utility model does not form part of the prior art…
Those words—“does not form part of the prior art”—are the most expensive takeaway in this lesson. Your own product launch, marketing, and demo videos all become “prior art.” When you later file, the examiner uses your own launch event to kill your novelty—every time.
Right order: 1 file patent → 2 ship product
File before launch and novelty stays. Once the filing date is locked, later releases, trade shows, and marketing are fine—your own disclosure can’t reach back before your filing date.
Wrong order: 1 ship product → 2 file patent
Launch is disclosure; novelty is lost. File after that and the solution is already “prior art.” Refusal—and no fix. Among the six weapons, this is the only fully irreversible mistake.
Patent Law Article 24 leaves a six-month grace period, but it covers only four statutory situations: first disclosure for the public interest in a national emergency; first publication at a designated academic or technical conference; first exhibition at a government-sponsored or recognized international exhibition; and disclosure by others without your consent. Your own product launch, WeChat official-account posts, or a leaked fundraising BP are not on that list. Don’t bet on the grace period.
Two questions put your core tech into this decision tree.
Three common scenarios—does each one consume novelty? Question 2 is the one people miss most.
After the 2025 revision of the Anti-Unfair Competition Law, civil enforcement rules for trade secrets tilted toward rights holders: once you offer preliminary evidence that you took secrecy measures and reasonably show the secret was infringed, the burden of proof shifts to the alleged infringer to show they didn’t infringe. For willful infringement under serious circumstances, punitive damages of one to five times actual loss may also apply.
In civil proceedings for trade-secret infringement, where the rights holder provides preliminary evidence that secrecy measures were taken for the claimed trade secret and reasonably indicates that the trade secret was infringed, the alleged infringer shall prove that the claimed trade secret does not constitute a trade secret under this Law.
The premise is still three words: secrecy measures. Agreements, access controls, access logs—if you never did them day to day, you can’t even clear the “preliminary evidence” step in court.
Counterintuitive advice. Quality gaps in patent documents are invisible day to day—they all show on the day a competitor files for invalidation.
- Cheap agents write thin claims competitors walk around or invalidate outright. The fee you saved costs you protection for hundreds of thousands of yuan in R&D.
- Only solid documents survive invalidation challenges. A patent’s value sits entirely in “it won’t invalidate.”
- Pick agents by same-field cases they’ve written—not by the quote sheet.
Patents and trade secrets can cross-cut. Big companies do this routinely; OPC founders can too.
- Parts that are externally visible and easy to reverse-engineer—file patents for official exclusive rights.
- Server-side scheduling logic, data mixes, prompt systems—keep as trade secrets for ongoing protection.
- When drafting patents, don’t “casually” write the secret half into the specification. Guard the disclosure boundary yourself.
File first, disclose later. Launches, shows, and marketing all after the filing date. Reverse the order and there’s never a fix.
Easy to reverse-engineer → patent; holdable → trade secret. Opposite logics—decide before you act.
A patent’s value is “it won’t invalidate.” Choose agents on quality; only invalidation day tells you if the spend was right.
Trade-secret enforcement rests on everyday secrecy measures. The 2025 law shifts the burden to the other side—but only if you have preliminary evidence.
Legal sources: Patent Law of the People's Republic of China (2020 Amendment, effective June 1, 2021), Articles 9, 22, 24, and 42—full text on the CNIPA website; Anti-Unfair Competition Law of the People's Republic of China (revised June 27, 2025, effective October 15, 2025), Articles 10, 22, and 39. Verified for this lesson on 2026-08-10. The Coca-Cola formula is a classic publicly reported example of trade-secret protection; the formula itself has never been disclosed.