Short answer. Generally no. When you buy a specified article under its patent or trade name, the Civil Code gives you no implied warranty that it suits your particular purpose, unless the contract says otherwise. You are treated as having chosen the brand yourself, on your own judgment.
What the law says
In the case of contract of sale of a specified article under its patent or other trade name, there is no warranty as to its fitness for any particular purpose, unless there is a stipulation to the contrary.
Civil Code, Article 1563 — Sale Under a Trade Name. Read the full provision →
The reason behind the rule
Ordinarily, a buyer who tells the seller what he needs the goods for, and leaves the choice to the seller's skill, gets the benefit of an implied warranty that the goods will do that job. This article carves out the opposite situation. If you walk in and ask for a particular product by its brand or patent name, you have made the selection yourself. The seller is supplying the thing you specified, not exercising judgment on your behalf, and the law does not make him answer for whether that thing was the right choice for your problem. The distinction is about who picked the product, not about how well-known the brand is.
What the rule does not take away
This is a narrow exclusion and it is often over-read. It removes the warranty of fitness for a particular purpose — nothing else. The seller still has to deliver the genuine article you named, in the condition a sale requires. The warranty against hidden defects survives, so a branded unit that is faulty, not merely unsuitable, remains a live complaint. So does the warranty against eviction, and so does any express promise the seller actually made. A product that fails to do what its own maker advertises is not protected by this article either; the shield covers suitability for your use, not defective goods.
"Unless there is a stipulation to the contrary"
Those closing words are the practical escape. The rule is a default, not a prohibition, and the parties are free to agree that the goods must serve a stated purpose. In commercial supply this is routine: the purchase order recites the application, the specification sheet is attached, the seller confirms suitability in writing. If a supplier is telling you a branded machine will handle your production line, the way to make that promise enforceable is to have it written into the contract or the quotation before you pay, rather than relying on what a sales representative said over the phone.
Where consumers stand
Sales to ordinary consumers do not depend on the Civil Code alone. Separate consumer-protection legislation supplies its own express and implied warranty regime for consumer products, together with remedies such as repair, replacement or refund, and it limits how far a seller can contract out of them. So a household buyer of a defective appliance is rarely left with nothing simply because he asked for the item by brand. The Civil Code rule bites hardest in business-to-business dealings, where sophisticated parties are expected to specify their own requirements. Either way, the safest habit is the same: describe the intended use in writing before you buy, keep the quotation and specification sheet, and raise any complaint with the seller promptly rather than after months of continued use.