Invention Assignment Laws in Missouri: Who Owns What You Create

Federal law does not provide a uniform rule on invention assignment. Instead, the question is governed by state contract law and principles articulated in the Restatement (Third) of Employment Law. The federal patent system (35 U.S.C. § 101 et seq.) grants patent rights to the inventor unless a valid assignment agreement exists. The Defend Trade Secrets Act (18 U.S.C. § 1836) protects trade secrets but does not automatically assign inventions. The National Labor Relations Act (29 U.S.C. § 151 et seq.) may restrict certain assignment clauses if they interfere with employee organizing rights. Federal courts have consistently held that absent a clear, written assignment agreement, inventions belong to the employee-inventor, not the employer. The federal baseline is employee-protective: inventions are presumed to belong to the person who created them unless a valid, specific agreement says otherwise.

Federal patent law (35 U.S.C. § 201) states that patents vest in the inventor unless assigned by written instrument. Courts interpret patent assignment agreements narrowly, requiring explicit language to transfer ownership. The DTSA (18 U.S.C. § 1836) defines trade secrets as information that derives value from not being generally known and is subject to reasonable measures to maintain secrecy. An employer may protect trade secrets through confidentiality agreements, but this does not automatically transfer ownership of inventions. The NLRB has found that overly broad assignment clauses may violate the NLRA if they chill employee rights.

At the federal level, the burden is on the employer to prove a valid assignment through clear contractual language. Vague or ambiguous assignment clauses are construed against the drafter (the employer). Federal courts in invention disputes apply state law to determine whether an assignment is enforceable, then apply federal patent law to determine rights in the patent itself. Remedies at the federal level include injunctive relief, damages, and attorney fees in trade secret misappropriation cases under the DTSA.

Missouri does not have a specific statute defining invention assignment rights. Instead, Missouri applies general contract law principles and adheres to the Restatement (Third) of Employment Law § 8.01, which establishes that an employer owns an invention made by an employee if: (1) the invention was made in the course of the employee's employment and relates to the employer's existing or prospective business, or (2) the invention results from work performed by the employee for the employer, or (3) the invention was developed using the employer's materials, equipment, or confidential information. Under Restatement § 8.02, an employee owns an invention made on their own time, using their own resources, that does not relate to the employer's business and is not developed with the employer's assistance or knowledge.

Missouri's approach is employee-protective compared to some states. Missouri courts have not adopted an automatic work-made-for-hire rule for inventions. Instead, the presumption is that inventions belong to the employee unless a specific, clear written agreement transfers ownership. Missouri Revised Statutes § 401.720 addresses restrictive covenants (including non-compete agreements) and establishes that such covenants are unenforceable unless they are reasonable in duration, geographic area, and line of business. This statute applies by analogy to invention assignment clauses: an assignment clause that is unreasonably broad (covering all inventions, past and future, regardless of connection to the employer) may be deemed unenforceable as an unreasonable restraint of trade.

Missouri recognizes the Uniform Trade Secrets Act (Mo. Rev. Stat. § 417.450 et seq.), which protects proprietary information and trade secrets but does not automatically assign inventions. An employer may protect trade secrets through a separate confidentiality agreement, but such an agreement does not transfer ownership of underlying inventions. Missouri law also distinguishes between assignment of invention ownership and licensing of invention use: an employer may have the right to use an invention without owning it outright.

Missouri employers are covered by the federal patent system and DTSA, but state contract law governs whether a valid assignment exists. Employees in Missouri have stronger protections than in states with automatic shop-rights doctrines. Remedies available under Missouri law include breach of contract claims, specific performance (to enforce or enjoin assignment), and damages for misappropriation of trade secrets. Missouri also recognizes employee rights to consult an attorney about overbroad assignment clauses and has public policy against unreasonable restraints on employee mobility and innovation.

Missouri recognizes several important exceptions to invention assignment. First, an employee may not be required to assign inventions created entirely on their own time, using their own materials and equipment, that do not relate to the employer's business and do not use the employer's confidential information. This is the clearest exception and is presumed under Restatement § 8.02.

Second, if an invention assignment clause is overly broad or unreasonable, it may be unenforceable under Missouri's public policy against unreasonable restraints on trade (Mo. Rev. Stat. § 401.720). For example, a clause that assigns all inventions created by an employee forever, even after termination and outside the employer's field of business, is likely unenforceable. Overbroad clauses have been struck down in other Restatement-adopting jurisdictions as unenforceable restraints of trade.

Third, assignment clauses may be unenforceable if they conflict with the employee's rights under the National Labor Relations Act (29 U.S.C. § 151 et seq.). If an assignment clause is used to prevent unionization or collective bargaining, it may violate the NLRA. Missouri courts would not enforce such a clause.

Fourth, invention assignment clauses are unenforceable against ideas, concepts, or mental work that do not rise to the level of a patentable invention or trade secret. Assignment of ideas is generally disfavored unless the idea has concrete value and relates to the employer's business.

Fifth, Missouri recognizes an exception for inventions that were developed before the employee's employment began. An employer cannot claim assignment of pre-employment inventions unless the employee fraudulently misrepresented their status.

Sixth, if an invention assignment clause is not in a written, signed agreement, it may be unenforceable under the statute of frauds. Missouri requires a clear, written instrument to transfer property rights, including invention ownership.

Seventh, assignment clauses for inventions made by independent contractors are subject to heightened scrutiny because independent contractors are not employees. An independent contractor retains ownership of inventions unless there is a specific, written agreement to the contrary.

Step 1: Document Everything Related to the Invention. Keep detailed records of when you created the invention, what resources you used, whether you used employer equipment or materials, and whether the invention relates to your employer's business. Write down the dates, times, and circumstances of creation. Save all drafts, notes, sketches, code, prototypes, and communications about the invention. Document whether you worked on the invention during work hours or after hours, at the office or at home. If the invention was created before you were hired, document the development history with dates. Preserve all communications with your employer about the invention, including emails and messages.

Step 2: Review Your Employment Contract and Understand Internal Policies. Obtain a copy of your employment agreement, offer letter, employee handbook, and any invention assignment or non-compete agreement you signed. Read the exact language of any assignment clause carefully. Identify what the clause actually claims to cover: Does it apply only to inventions related to the employer's business, or all inventions? Does it cover inventions made on personal time? Does it cover inventions made after you leave the company? Determine the scope and specificity of the clause. Consider whether the clause is reasonable in scope or overly broad. Internal policies matter because an employer's handbook or practice may limit or clarify the scope of an assignment clause. If your company has a policy that employees own inventions created on personal time without employer resources, document this.

Step 3: File an Internal Complaint or Request Clarification. Before escalating externally, send a written email to your manager, HR department, or general counsel asking for clarification on whether your specific invention is subject to the assignment clause. Clearly describe the invention, when and where it was created, what resources were used, and whether it relates to the employer's business. Ask for a written response explaining why the employer claims ownership, if that is the case. Keep a copy of your request and any responses. This creates a paper trail and gives the employer an opportunity to reconsider. If the employer responds reasonably (e.g., 'You own this; it's not related to our business'), document this in writing. If the employer responds that they own your invention but the assignment clause does not clearly cover it, or if the response is vague, escalate to step 4.

Step 4: Consult an Employment or Intellectual Property Attorney in Missouri. Before filing any formal complaint or taking action, consult a Missouri attorney who specializes in employment law or intellectual property law. An attorney can review your specific invention assignment clause and advise whether it is enforceable under Missouri law. They can assess whether the clause is overly broad or unreasonable. They can evaluate whether your invention falls within the scope of the enforceable clause. They can advise on your options, including negotiating with the employer, licensing the invention to the employer without assignment, or challenging the assignment in court. Bring all documentation to the attorney: your employment agreement, the invention details, the development timeline, and any communications with the employer. An attorney may also advise on patent filing deadlines if patent protection is relevant (1-year grace period under 35 U.S.C. § 102(b)(1) after public disclosure).

Step 5: Attempt Negotiation or Seek Mediation. With your attorney's advice, attempt to negotiate with your employer. Propose alternatives to full assignment: (1) A license to the employer to use the invention in the employer's field of business, while you retain ownership; (2) Co-ownership of any patent; (3) A buy-out: the employer purchases the invention for a fixed fee; (4) A carve-out: the employer releases the specific invention from the assignment clause. Propose these options in writing. If negotiation fails, consider mediation through the Missouri Bar Association's mediation program (cost is typically lower than litigation). Mediation can help resolve disputes without a lawsuit.

Step 6: File a Lawsuit if Necessary and No Administrative Agency Jurisdiction Exists. Unlike discrimination claims, invention assignment disputes are not handled by the Missouri Commission on Human Rights or the EEOC. These are civil contract disputes. If negotiation and mediation fail, file a breach of contract claim in Missouri state court (circuit court in the county where the employment relationship was centered or where the invention was created). The complaint should allege: (1) the employment agreement or assignment clause, (2) the invention and its development, (3) that the invention does not fall within the enforceable scope of the assignment clause (or that the clause is overly broad and unenforceable), and (4) damages (value of the invention, attorney fees if provided in the agreement or by statute). Provide all documentation. The defendant (employer) will have time to respond. Discovery follows, where both sides exchange documents and evidence. The case may settle during discovery or proceed to trial. Missouri courts apply contract interpretation principles and may strike unenforceable clauses as unreasonable restraints of trade. Remedies include a declaration that you own the invention, an injunction against the employer claiming ownership, and damages for any losses caused by the employer's breach.

Step 7: Consider Patent Protection if Applicable. If the invention is patentable, consider filing a provisional patent application (PPA) with the U.S. Patent and Trademark Office to establish priority and preserve your rights. A PPA costs approximately $320 (small entity) to $1,280 (large entity) and provides 12 months of priority while you resolve the ownership dispute with your employer. Filing a PPA does not require final claims and can be done quickly. However, do not file a patent application without consulting your attorney first, as doing so may trigger employer claims or complicate settlement negotiations. If you file a patent application, you must disclose any obligation to assign the invention to your employer (failure to do so is fraud on the patent office). After the ownership dispute is resolved in your favor, you can file a nonprovisional patent application to obtain a patent.