How to Protect Your Invention Before You File a Patent

The gap between having an invention and filing a patent application can be weeks or months. During that gap, you need to do things that require talking to people — getting manufacturing quotes, pitching to investors, consulting engineers, testing materials, showing prototypes to potential customers. Every one of these conversations is a potential disclosure that can compromise your patent rights.

This article covers how to navigate that gap safely: what you can share, what you must keep secret, which protective tools actually work, and how to move your invention forward commercially without sacrificing the IP protection you will need later.

The Pre-Filing Risk

Until you file a patent application, your invention has no patent protection. It is not "patent pending." No law prevents anyone from using your idea if they learn about it. Your only protections during this period are:

Confidentiality (NDAs and trade secret law): Contractual obligations that prevent the people you tell from sharing or using your information without permission.

Secrecy: Simply not telling anyone.

Speed: Filing as quickly as possible to minimise the window of exposure.

The optimal strategy uses all three: keep the circle of knowledge as small as possible, protect every disclosure with an NDA, and file a provisional patent application as soon as the invention is sufficiently documented.

Who You Will Need to Talk To — and How to Protect Each Conversation

Potential Co-Inventors and Collaborators

Risk level: High. A collaborator who contributes to the inventive concept may become a co-inventor with independent ownership rights.

Protection: Sign a Co-Inventor Agreement before beginning any collaborative work. The agreement should address IP ownership, revenue sharing, and decision-making authority. See: Co-Invenctor Agreements

Engineers and Prototype Builders

Risk level: Medium-High. They will see your full technical design. A contractor who makes a creative contribution to the invention may acquire co-inventorship.

Protection: Sign an NDA and a Prototype Development Agreement with an explicit IP assignment clause — before sharing any technical files. The IP assignment clause ensures that any inventive contribution made by the contractor is assigned to you. See: Essential Contracts for Inventors

Manufacturers

Risk level: High — especially overseas. Sharing CAD files, specifications, and Bill of Materials with a manufacturer gives them everything they need to produce your product — for you, and potentially for anyone else.

Protection: NDA signed before any disclosure. File a patent application in the manufacturing jurisdiction before sharing detailed designs. For China: file a Chinese utility model (registered in 6–12 months, costs under $3,000) before sending files to any Chinese manufacturer. See: Country Guide: Filing a Patent in China

Investors

Risk level: Medium. Most investors need to understand the concept, not the detailed mechanism. Many institutional investors and VCs refuse to sign NDAs before initial meetings — this is standard practice, not a red flag.

Protection: For initial meetings where no NDA is signed: share only what is conceptual and general. Describe the problem, the market, and the result your invention achieves — without revealing how the mechanism works internally. "Our patented technology reduces thermal failure by 30%" reveals the result. "The mechanism uses a copper heat pipe with a capillary wicking structure in a specific configuration" reveals the invention.

Once mutual interest is established and serious discussions begin, request an NDA before sharing technical details, patent applications, or prototype specifications.

Patent Attorneys

Risk level: None. Attorney-client privilege protects all communications with your patent attorney. You can disclose everything to your attorney without any risk to your patent rights or confidentiality. This privilege exists in every major jurisdiction.

Friends, Family, and Social Connections

Risk level: Deceptively high. Casual conversations feel safe but can constitute public disclosure if the recipient has no obligation of confidentiality. Telling your brother-in-law about your invention over dinner is technically a public disclosure — and if he tells someone else, the chain of disclosure is outside your control.

Protection: Keep it vague. "I'm working on a new product idea" is fine. "I invented a valve that uses a pressure-differential seal to prevent backflow" is a disclosure. If you need genuine input from a trusted person, sign an NDA — even with family. It feels awkward. Losing your patent rights feels worse.

The NDA: Your Primary Pre-Filing Protection

A Non-Disclosure Agreement creates a legally enforceable obligation of confidentiality. If the recipient discloses or misuses your information, you have a contractual basis for legal action.

When an NDA Works

• The other party signs before you share anything substantive
• The NDA clearly defines what is confidential
• The NDA specifies the permitted purpose (evaluation, manufacturing quote, etc.)
• The NDA has a reasonable duration (3–5 years, with trade secret carve-out)
• The NDA is governed by a jurisdiction with effective contract enforcement

When an NDA Does Not Work

• The other party refuses to sign (common with large companies and VCs for initial meetings)
• The other party is in a jurisdiction where contract enforcement is weak or slow
• The disclosure has already happened before the NDA is signed (an NDA cannot retroactively protect information already shared)
• The NDA is so broadly drafted that a court deems it unenforceable

The Practical Solution for Non-Signers

When a potential partner, investor, or large company will not sign an NDA:

Level 1 — Share only published information. If you have a published patent application (18 months after filing), share the published document. It is already public — no NDA needed.

Level 2 — Share the result, not the mechanism. Describe what your invention does and the market opportunity, without explaining how it works internally. This is enough for most initial business conversations.

Level 3 — File first, then share freely. A filed patent application (even a provisional) gives you "patent pending" status. Once filed, you can share the invention's details without destroying novelty — the filing date is established. This is the cleanest solution: file the provisional, then share without restriction.

The Provisional Patent Application: Your Bridge to Full Protection

A provisional patent application is the most effective pre-filing protection tool — because it converts your status from "unprotected" to "patent pending" at minimal cost.

What it does:

• Establishes your priority date (the date that matters for novelty and first-to-file)
• Allows you to use "patent pending" on products and marketing
• Gives you 12 months to test the market, build prototypes, and prepare the full application
• Costs $2,000–$5,000 with attorney assistance

What it does not do:

• It does not get examined
• It does not become a patent
• It does not protect you forever — it expires after 12 months if not converted to a non-provisional
• It only protects what is adequately described in the provisional — features added later get the later filing date

The strategic sequence: File the provisional → share the invention freely with signed NDAs → use the 12-month window to validate commercially → file the non-provisional incorporating everything you learned.

Trade Secret Protection: The Parallel Layer

While NDAs protect specific disclosures, trade secret law provides broader protection for confidential business information — without any filing or registration.

What qualifies as a trade secret: Any information that derives economic value from being secret and that is subject to reasonable measures to keep it secret. Your invention's technical details, your manufacturing process, your test data, your supplier relationships, and your business strategy can all qualify.

What "reasonable measures" means in practice:

• Using NDAs consistently with everyone who receives confidential information
• Marking confidential documents as "CONFIDENTIAL" or "PROPRIETARY"
• Limiting access to confidential information to those who need it
• Using password protection and access controls for digital files
• Having employees and contractors sign confidentiality agreements

Why trade secret matters pre-filing: If someone misappropriates your invention before you file — stealing your design files, breaching an NDA, or using information obtained under a duty of confidence — trade secret law provides a cause of action for damages and injunctive relief, independent of any patent right. In many jurisdictions, trade secret protection is stronger and faster than patent enforcement for pre-filing theft.

The Timing Decision: When to File

File immediately if:

• You are about to disclose publicly (trade show, crowdfunding, product launch)
• You have reason to believe a competitor is working on the same technology
• You need to share detailed specifications with a manufacturer in a no-grace-period jurisdiction
• The invention is sufficiently documented to describe in a patent application

Take 2–4 weeks if:

• The invention is still being refined and you want to capture improvements in the filing
• You are conducting a prior art search that may affect how you draft claims
• You need to engage a patent attorney and prepare a quality provisional

Take 2–3 months if:

• The invention is at an early concept stage and you want to build a proof-of-concept before committing to filing costs
• You are assessing commercial viability before investing in IP protection
• You have no competitive urgency and can afford to develop further

In all cases, maintain strict confidentiality until the application is filed. The trade-off is always between filing quality (better with more development time) and filing urgency (better with less delay). When in doubt, file the provisional now and improve later — because a filed-but-imperfect provisional beats a perfect application filed after someone else has beaten you to the patent office.

Sources

1. WIPO - Trade Secrets — WIPO guidance on protecting confidential information and trade secrets before patent filing
2. USPTO - Patent Basics — Information on provisional applications and pre-filing protection strategies
3. 35 U.S.C. §102 (Novelty and Grace Period) — US statutory rules on what constitutes a novelty-destroying disclosure and the 12-month grace period
4. EPO - Guidelines for Examination — European rules on novelty, prior art, and the strict approach to pre-filing disclosure