Doctrine of Repair and Reconstruction¶

A United States patent-law boundary that permits an owner or authorized user to preserve a particular patented article, while treating work that in substance makes a new patented article as infringing reconstruction.

Version: v4 · 2026-09-19 · History · 1 correction
Domain-specific #: 1705
Domain group: Professional & Organizational Practice
Origin domain: Law & Governance
Subdomains: United States Patent Law, Patent Exhaustion and Infringement → Law & Governance
Aliases: Repair–reconstruction doctrine, Patent repair doctrine, Permissible repair doctrine

Core Idea¶

The doctrine of repair and reconstruction is a United States patent-law boundary between two acts performed on a particular patented article. Permissible repair preserves, restores, or adapts the useful capacity of the article already lawfully acquired or otherwise authorized. Impermissible reconstruction crosses from continued use of that article into making the patented invention anew. Because 35 U.S.C. § 271(a) makes unauthorized “making” an act of infringement, reconstruction can infringe even though the actor owns old components and even though none of the replaced components is separately patented.

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Fixing vs. Making New

Suppose you buy a toy car that only one company is allowed to make. If a wheel breaks, you can fix it or put on a new wheel, because it is your car. But if the whole car is worn out and you build a brand-new one from the design, that is like making a new car, and only the company may do that.

Repair Is Fine, Rebuild Is Not

When an invention is patented, only the patent owner may make it. But once you buy a patented item, it is yours, and you can use it, fix it, and sell it. The doctrine of repair and reconstruction draws the line between fixing your item, which is allowed, and basically making a brand-new copy of the invention, which is not. Courts look at what was actually done, not whether someone called it 'repair' or 'rebuild'. Replacing a part that wears out is usually repair, but rebuilding a whole item that was completely used up can count as making a new one.

Repair Versus Second Creation

The doctrine of repair and reconstruction is a US patent-law boundary for work done on a patented item. When a patented item is sold with authorization, the patent rights in that particular item are exhausted, so the buyer can use, maintain, repair, and resell it. But exhaustion does not permit making a new copy, and US patent law makes unauthorized 'making' infringement. Permissible repair restores or keeps up the usefulness of the item you already have; impermissible reconstruction effectively makes the patented invention anew, even if the parts replaced are not separately patented. The Supreme Court, in Aro Manufacturing, asked whether the patented item as a whole was spent and whether the work amounted to a 'second creation'. Courts look at the substance, not labels like refurbish or remanufacture, and no single factor or percentage test decides every case.

The doctrine of repair and reconstruction is a United States patent-law boundary between two acts on a particular patented article. Permissible repair preserves, restores, or adapts the useful capacity of an article lawfully acquired or otherwise authorized; impermissible reconstruction crosses into making the patented invention anew. Because 35 U.S.C. 271(a) makes unauthorized making an infringing act, reconstruction can infringe even when the actor owns the old components and none of the replaced parts is separately patented. Under Aro Manufacturing Co. v. Convertible Top Replacement Co., the question is whether the patented entity, viewed as a whole, had become spent and whether the intervention in substance produced a second creation of the claimed entity. The doctrine mediates between the patentee's right to exclude others from making the invention and patent exhaustion, under which an authorized sale transfers that particular item into the buyer's personal property with ordinary rights to use, maintain, repair, and resell, but not to manufacture another copy. Classification does not follow labels like refurbish, refill, or rebuild, and there is no mechanical percentage test. Courts weigh the claimed invention as a whole, the useful lives and replaceability of parts, whether the whole was spent, the nature and extent of the work, persistence of original components, and ordinary maintenance expectations, and a patentee cannot make an unpatented component the protected heart of a combination merely by emphasizing it.

Scope of Application¶

The doctrine applies in United States patent-infringement disputes concerning tangible patented machines, manufactures, and combinations that undergo maintenance, component replacement, refurbishment, modification, or repeated commercial use. It is particularly important where a durable whole contains consumable or shorter-lived unpatented parts, where an aftermarket supplier sells replacements, or where a remanufacturer collects spent or used articles and returns them to commerce.

Recurring settings include vehicle parts, machine tooling, filters, medical and industrial equipment, cartridges, single-use cameras, and other products for which the asserted patent covers a combination rather than every individual component.

Clarity¶

The fastest diagnostic is to ask five questions in sequence:

What exactly do the asserted claims cover? A component, a combination, or the entire article?
Was this particular article lawfully made and sold or otherwise authorized? If not, exhaustion and the repair entitlement may never attach.
What failed, wore out, or was changed? Identify the component's expected relation to the useful life of the whole rather than relying on its cost alone.

Manages Complexity¶

Without the doctrine, every act of maintenance would sit uneasily between the patent owner's exclusive right to make and the purchaser's ordinary power to use owned property. A combination patent could otherwise be leveraged into recurring control over every replacement of an unpatented wear part. At the opposite extreme, calling every remanufacturing operation “repair” would let a purchaser convert one authorized article into an unlimited license to manufacture the invention.

Abstract Reasoning¶

The doctrine supports several disciplined inferences.

Claim scope precedes physical intuition. The same physical replacement can have different legal meaning depending on what the patent claims. If a patent claims a whole combination and the replaced item is an unpatented consumable, replacement may preserve the combination. If the patent claims the replaced article itself, fabricating it can be an unauthorized making.

Knowledge Transfer¶

Within U.S. patent practice, the same analytical sequence transfers across products: identify the asserted claim, establish the authorized article, map expected component lives, document the intervention, and decide whether the claimed whole persists. The sequence has recurred from nineteenth-century planing-machine knives to convertible fabrics, canning-machine modifications, carbide drills, filters, cameras, and toner cartridges.

The doctrine also transfers among institutional roles. Product counsel can evaluate whether a service program risks unauthorized making. A repair business can preserve provenance and step-by-step process evidence.

Relationships to Other Abstractions¶

Current abstraction Doctrine of Repair and Reconstruction Domain-specific

Parents (1) — outgoing typed relations

Doctrine of Repair and Reconstruction presupposes Property Rights Prime

Property Rights is the broader abstraction this entry instantiates the doctrine presupposes.

Hierarchy path (1) — routes to 1 parentless root

Doctrine of Repair and Reconstruction → presupposes Property Rights → is a decomposition of Boundary

Neighborhood in Abstraction Space¶

Doctrine of Repair and Reconstruction sits in a sparse region of the domain-specific corpus (99^th percentile for distinctiveness): few abstractions share its structure, so a faithful description tends to retrieve it precisely.

Family — Unclustered & Miscellaneous (2769 abstractions)

Nearest neighbors

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