Invention Assignment Laws in Minnesota: Who Owns What You Create

Federal law does not establish a uniform rule for invention ownership. The federal government does not regulate private-sector invention assignments through a single statute. Instead, invention rights are governed by state law and the employment contract itself. At the federal level, the Patent Law (35 U.S.C.) addresses patents generally but does not mandate that employers own employee inventions; this is left to individual agreements and state law. The only federal exception is for federal employees, who must assign patent rights to the U.S. government under 35 U.S.C. § 4956.

In the private sector, without a specific written agreement, courts in most jurisdictions apply the "shop right" doctrine, which gives employers a limited right to use employee inventions created during employment using company resources, but does not automatically transfer ownership. Some states, like California, have stronger protections for employees, prohibiting assignment of inventions made on personal time entirely. The EEOC and Department of Labor do not enforce invention assignment agreements; such disputes are handled through state contract law and patent law. Federal courts defer to state law on invention ownership questions unless federal patent law specifically applies.

Minnesota Statute 181.78 is the controlling state statute for invention assignments. It is significantly more employee-protective than the federal default rule. Under M.S. § 181.78, an employer can only claim ownership of an invention if: (1) the invention was developed entirely on company time, or (2) the invention was developed using company equipment, supplies, facilities, or information, or (3) the invention relates to the employer's business or anticipated business and was developed with knowledge or use of the employer's confidential information.

Critically, § 181.78(b) provides an absolute carve-out: any invention developed entirely on the employee's own time and using the employee's own materials, without using any company resources or confidential information, belongs solely to the employee—even if it is work-related or similar to the employer's business. This is much stronger than federal law, which has no such prohibition.

Furthermore, M.S. § 181.78(c) requires that any employment agreement, contract, or policy claiming broader rights to employee inventions must be provided to the employee in writing and conspicuously displayed. Vague or hidden assignment clauses are unenforceable.

Minnesota Statute 181.80 addresses non-compete and non-solicitation agreements. Minnesota courts strictly construe these agreements and require them to be (1) in writing, (2) reasonable in scope, duration, and geographic area, and (3) supported by legitimate business interests such as trade secrets or confidential information. A non-compete agreement cannot be used to prevent an employee from pursuing legitimate work after leaving employment, and courts will not enforce overly broad restrictions.

All employers in Minnesota are covered by these statutes, regardless of size. There is no employer threshold. State law applies to all private-sector employment agreements. Remedies for violations include injunctive relief (court order to stop enforcement), damages for economic loss, and in some cases attorney's fees. An employee who contests an invention assignment claim or refuses to sign an overly broad agreement can pursue a declaratory judgment action to establish that the agreement is void or unenforceable.

Minnesota law recognizes several important exceptions and limitations to employer invention ownership claims:

First, the personal time and resources carve-out in M.S. § 181.78(b) is absolute and applies even if the invention is work-related or similar to the employer's business. An employer cannot claim an invention if the employee created it entirely outside work hours using only personal materials, regardless of the invention's connection to the employer's field.

Second, inventions created before the employment relationship began are not subject to assignment. An employee who brings an invention or patent into employment retains ownership, unless there is an explicit written agreement transferring pre-employment IP to the employer (and even then, Minnesota courts scrutinize such agreements).

Third, inventions created after the employment terminates belong to the employee, even if the employee used information learned during employment. Once the employment relationship ends, the employer has no claim to future inventions, subject to legitimate trade secret restrictions.

Fourth, inventions made by an employee during a leave of absence or suspension may fall outside the employer's claim if the employee was not on active duty or using company resources during the invention period.

Fifth, M.S. § 181.80 limits non-compete agreements. Even if an employment contract includes an invention assignment clause, a non-compete clause cannot be enforced if it is unreasonable in scope, duration, or geography, or if the employer cannot prove a legitimate business interest (such as protection of trade secrets). Employers often try to use non-compete clauses to prevent employees from working in the same field after leaving; Minnesota courts will refuse to enforce such clauses if they are broader than necessary to protect legitimate business interests.

Sixth, Minnesota Statute 181.81 protects whistleblowers. An employer cannot enforce a non-compete or invention assignment agreement against an employee who reports illegal activity or participates in legal proceedings. If an employer attempts to use an invention assignment claim to punish an employee for whistleblowing or legal involvement, the agreement may be void as against public policy.

Lastly, if an invention assignment agreement is not provided to the employee in writing and conspicuously displayed, or if it is vague, hidden in fine print, or imposed retroactively, it is unenforceable under M.S. § 181.78(c).

Step 1: Document Everything.

Keep detailed records of when and where you developed the invention. Document all work on personal time: save emails, notes, sketches, code commits, or other evidence showing the invention was created outside work hours. Keep receipts for personal materials, software, or equipment purchased with your own money and used for the project. Take screenshots or photos of your work environment if you developed the invention at home. Create a dated log or journal entry describing the project timeline, resources used, and your independent effort. If you have witnesses who can confirm you worked on personal time, note their names and contact information. Save copies of your employment contract, any invention assignment agreement provided by your employer, and any company policy documents related to inventions.

Step 2: Understand the Company's Position and Send a Written Notice.

Before filing any legal claim, send a detailed written letter to your employer explaining why the invention is yours under Minnesota law. Explain specifically: (1) the invention was developed entirely on personal time, (2) using personal materials and resources, (3) without accessing company confidential information or using company equipment, and (4) outside the employer's business or anticipated business (if applicable). Include dates, times, and specific facts. Request a written acknowledgment from your employer that the invention is yours. If your employer claims ownership anyway, ask them to provide the specific basis in writing. Keep a copy of this letter for your records. This creates a clear paper trail and may help if litigation becomes necessary.

Step 3: File a Declaratory Judgment Action in Minnesota State Court.

If your employer refuses to acknowledge your ownership or threatens to enforce an invention assignment agreement, you can file a declaratory judgment action in the Minnesota District Court in the county where you work or reside. There is no administrative agency in Minnesota that adjudicates invention ownership disputes; you must go to court. The action asks the court to declare that the invention belongs to you and that the employment agreement is unenforceable. You do not need to wait for the employer to sue first; you can initiate the action proactively. Filing requires payment of court fees (typically $200–$400 for the filing fee, depending on the county). The deadline for filing is governed by the six-year statute of limitations for breach of contract under Minnesota Statute 541.05, but file as soon as possible to preserve evidence.

Step 4: The Discovery and Investigation Process.

After filing, both you and your employer will enter discovery, a process where each side exchanges documents and testimony. Your employer's attorney will likely demand copies of all documents related to the invention, your work schedule, computer files, and any communications about the project. You will also have the right to depose (question under oath) your employer's representatives and any witnesses about the company's involvement in the invention. This discovery process typically takes 6–12 months. During this time, the court may schedule a settlement conference to encourage resolution. Be prepared to produce evidence proving you worked on personal time and did not use company resources. Your attorney will help identify and organize this evidence.

Step 5: Consult an Attorney and Prepare for Litigation or Settlement.

Contact an employment law attorney in Minnesota as soon as you realize there is a dispute. An attorney can review your employment contract, the invention assignment agreement, and your evidence to assess your legal position. If your case is strong (you have clear documentation of personal time and resources), you may have significant leverage in settlement negotiations. Your attorney may send a demand letter to the employer's counsel outlining your legal position and proposing a settlement. Many cases settle before trial; if settlement is reached, you and the employer will sign a written agreement transferring ownership of the invention to you and releasing any claims.

If settlement fails, your case will proceed to trial, where a judge (or jury, if either party requests) will decide ownership. This typically occurs 18–24 months after filing. Your attorney will present evidence, witness testimony, and legal arguments. The court will apply Minnesota Statute 181.78 and decide whether the invention belongs to you based on the specific facts of your case.