Robin Garr wrote:Bob, wouldn't the patent holder have a difficult time building a case, though (or even knowing he had one) if the infringer simply made the snickerdoodle for non-commercial enjoyment at home, without hope of profit or publicity?
Au contraire, Robin. The patent holder would have an open-and-shut case for infringement, once he or she discovered your use of the patent. Your only defense would be that the snickerdoodle patent was not valid in the first place.
This is the reward that the patent holder gets for disclosing the details of the invention. In return, the public, when the patent does expire, get to enjoy the invention without restrictions. The purpose of granting patents is to encourage invention disclosure. Before the existence of patents, the only way that an inventor could prevent competitors from exploiting an invention, without having incurred the expense of developing it in the first place, was to keep it a secret (what in intellectual property law is called a "trade secret"). The result was that much technology was lost due to inventors taking their secrets to their grave. Stradivarius's methods for manufacturing great violins, for example. Although there's lots of speculation, to this day we don't know exactly how he did it.
So society has decided to reward inventors for not keeping things a trade secret. You disclose the precise details of your invention, and in return, society will give you exclusive use of it for some number of years. After that, anyone can use it. Furthermore, if you DO decide instead to keep your invention secret, and someone else later independently makes the same discovery, but discloses and patents it, you lose the right to use the invention without the patent holder's permission--even though you discovered it first. That's the penalty for NOT patenting an invention, but instead deciding to keep it a trade secret.
Patent law says nothing about profit or publicity. It grants
exclusive, and that really, really means
EXCLUSIVE, rights to use the invention to the patent holder. NOBODY, for whatever reason, can use the invention without permission of the patent holder, until the term of the patent expires.
Now suppose that your hypothetical patented snickerdoodle is being made privately, at home, for personal enjoyment, without hope for profit or publicity. What damages has the infringement caused to the patent holder? Are they worth the hassle of litigation? Or the risk of a court deciding the patent wasn't valid after all? Those are practical considerations that might cause a patent holder to avoid bringing a court case against an infringer.
A patent must be proactively defended, so the patent holder, when made aware of your infringement, usually will send you a cease and desist letter saying, "Hey, you are infringing on my patent for snickerdoodles. Either we negotiate a license for your use of the patent, or you must stop using it at once." If, after that, you continue to infringe, then the patent holder could petition a court for an injunction prohibiting you from activities that infringe on the patent, and could ask the court to assign the legal costs he or she incurred in bringing that action to you, the guilty infringer.
A snickerdoodle patent holder might decide to grant a free non-commercial license to use the patent to those who do so for no personal gain, while charging a fee for commercial use. Thus, you might be able to negotiate a license to permit baking of snickerdoodles in your own kitchen free of charge, but Kraftco might have to pay through the nose to licensethe same technology to produce Kraft Brand Snickerknerdles (TM).
-Paul W.