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PatentBrief

Patent Ownership

Co-Ownership

Patent co-ownership is easier to stumble into than to manage. US § 262 lets each co-owner license independently — including to your competitors — without sharing royalties or asking your permission.

How does patent co-ownership arise and who qualifies as a co-owner?

Patent co-ownership arises from several distinct legal pathways.

Co-inventorship

  • The most common source
  • When two or more individuals jointly conceive the claimed invention, each becomes a co-inventor
  • US patents must name all inventors who contributed to the conception of at least one claim
  • Pannu v. Iolab (Fed. Cir. 1998): each co-inventor must (1) contribute to the conception of at least one claim
  • (2) make a significant contribution to the claimed invention
  • (3) more than explain well-known concepts or prior art
  • Since inventorship follows employers (through employment agreements), co-inventors from different organizations create co-ownership across organizations

Assignment to Multiple Parties

  • A patent owner can assign a fractional undivided interest to another party
  • This creates co-ownership by contract rather than inventorship
  • Example: Company A owns a patent
  • Acquires Company B
  • In the acquisition, Company A assigns 50% interest to Company B's former owners as part of settlement

Result of Joint Development without IP Agreement

  • The most problematic source
  • Two companies collaborate on technology
  • No clear IP ownership provision in the collaboration agreement
  • Employees of both companies contribute to conception
  • Patents name inventors from both companies
  • Neither company holds a full assignment

Assignment from Individual to Multiple Parties

  • An individual inventor holds the patent
  • Multiple parties each purchase a fractional interest

Statutory Framework

35 U.s.c. § 262

  • Default rules for co-owners
  • § 256: correction of inventorship
  • § 116: adding/removing inventors during prosecution.

What are the practical risks of patent co-ownership for each party?

Patent co-ownership creates specific risks that depend on the relationship between the co-owners.

Competitor Co-owner Scenario (Worst Case)

  • Company A and competitor Company B co-own a patent
  • Company B licenses the patent to all of Company A's customers at zero royalty
  • Company B refuses to join as co-plaintiff in enforcement actions
  • Company A is effectively left with no ability to monetize or enforce the patent

The Joinder Rule

  • Ethicon v. Quigg (Fed. Cir. 1988) and Ethicon v. United States Surgical (Fed. Cir. 1998): ALL co-owners must voluntarily join as co-plaintiffs in an infringement suit
  • A co-owner who refuses cannot be compelled to join (unlike in many foreign systems)
  • A compulsory joinder provision in a joint agreement CAN override this — but only by contract between the co-owners

Infringer's Exploitation of Co-ownership

  • An infringer can identify co-owners and approach the less powerful one for a cheap license
  • That license provides complete immunity against ALL co-owners
  • This is a known tactic in patent litigation

Licensing Income Dilution

  • Each co-owner can license the patent independently
  • The licensor keeps all royalties from its licenses
  • The other co-owner has no right to share
  • If both co-owners actively license, they may compete with each other in licensing negotiations

Non-economic Risks

  • If a co-owner goes bankrupt, its interest can be licensed by the bankruptcy trustee to competitors
  • If a co-owner is acquired by a competitor, the acquirer inherits the co-owner rights

International Operations

  • A US co-owner's rights are limited to the US patent
  • Foreign national phase patents may have different co-owners and be subject to local laws (requiring consent for licensing).

How does co-ownership work differently in other countries?

US § 262's permissive independent licensing rule is an exception — most countries require consent for licensing.

European Union. Under EPC and national laws, each co-owner can work the patent for its own benefit

But

  • Licensing requires CONSENT of all co-owners
  • This means a co-owner cannot grant a third-party license without permission of the other co-owners
  • Enforcement: co-owners act jointly or with authorization

United Kingdom. UK Patents Act § 36: each co-owner can work the invention for its own benefit without consent

But. Cannot grant licenses without consent of other co-owners

Germany

  • German Patent Act § 741 BGB applied: each co-owner can use the invention
  • Licensing requires all co-owners to consent
  • Enforcement: all co-owners must typically join

France

  • French Intellectual Property Code Article L613-29: each co-owner can exploit the patent independently
  • But sublicensing requires consent of all co-owners

China. Patent Law Article 15: each co-owner can independently exploit the patent

But

  • Cannot license to third parties without consent of all co-owners
  • Royalties from licenses must be shared among all co-owners

Japan

  • Patent Act Article 73: each co-owner can independently practice the patent
  • Licensing requires consent of all co-owners

Practical Implication for Global Portfolios

  • US co-ownership: independent licensing possible
  • Foreign co-ownership: licensing requires consent everywhere but the US

Strategy

  • Address international co-ownership rules when structuring global research collaborations
  • The consent requirement in most countries provides some protection against exploitation of co-ownership gaps.

How should co-ownership be addressed in collaboration agreements?

The best approach to co-ownership is to address it expressly before collaboration begins.

Option 1 — Avoid Co-ownership

  • Give each party sole ownership of the patents it invents
  • Cross-license to the other party
  • Advantages: clear ownership
  • Avoids § 262 problems
  • Enforcement not complicated
  • Disadvantage: requires careful division of patent rights between inventors

Option 2 — Designated Owner

  • One party is designated as the sole owner of all collaborative patents
  • The other party receives a license (exclusive or non-exclusive in its field of use)
  • Advantages: clear enforcement rights
  • Disadvantage: one party gives up ownership

Who Gets Ownership

  • The party contributing more inventive effort
  • The party closest to commercialization
  • The party taking most financial risk

Option 3 — Co-ownership with Modified Defaults

  • Co-ownership preserved but § 262 defaults modified by contract
  • Modifications may include: require consent of both parties for any licensing
  • Designate one party as managing owner for licensing and enforcement
  • Require profit sharing from licenses
  • Require consent for transfer of interest
  • Require compulsory joinder for enforcement

Joint Patent Management Committee

  • For portfolios with many jointly owned patents: committee with representatives from each company
  • Defined voting procedures
  • Defined licensing authority (which licenses can one party grant alone?)
  • Defined enforcement procedures
  • Cost sharing for prosecution and maintenance

Assignment Triggers. What happens when one party is acquired?

Rofr

  • Right of first refusal to buy co-owner's interest
  • Automatic assignment to the other co-owner on acquisition by a competitor

Publication and Disclosure Control

  • Both parties must agree before any publication disclosing jointly owned inventions
  • Minimum review period before submission.

What happens to co-owned patents in M&A transactions?

Mergers and acquisitions involving co-owned patents create complex issues that require specific diligence and structuring.

Due Diligence

  • Acquirer must identify all co-owned patents in the target's portfolio
  • For each co-owned patent: who is the co-owner?
  • What are the co-owner's rights under the agreement (if any)?
  • Are there any consent requirements for transfer?

Transferability

  • A co-owner's interest is transferable unless the agreement restricts it
  • § 262 allows transfer of an undivided interest
  • The transferee steps into the transferor's shoes as a co-owner

Change of Control Provisions

  • Well-drafted co-ownership agreements include change of control provisions: if a party is acquired by a competitor of the other co-owner, the acquirer may NOT receive co-owner rights
  • Instead, the interest converts to a non-exclusive license
  • Or the other co-owner has a right to purchase the interest

Rofr on Change of Control

  • If Company A (co-owner) is acquired by Company B (competitor of Company C, the other co-owner), Company C has the right to buy Company A's co-ownership interest before it passes to Company B
  • Prevents competitor from becoming a co-owner

Hostile Acquisition Scenario

  • Competitor acquires a company holding co-owner rights
  • Now the competitor is a co-owner
  • Can license to all other competitors
  • Can refuse to join enforcement actions
  • The remaining co-owner loses all practical enforcement rights

Restructuring Options

  • After a problematic acquisition: negotiate for the acquirer to transfer/license co-owner rights back
  • Offer to buy out co-owner rights
  • Negotiate a cross-license that effectively terminates the co-ownership problem

Valuation

  • Co-owned patents are often valued lower than solely owned patents due to enforcement difficulties
  • Buyers should discount accordingly.

Related guides

Joint OwnershipInventorshipPatent AssignmentCo-Ownership DetailsNon-Exclusive License