Welsbach Light Co. v. Union Incandescent Light Co.

That part of the order appealed from restraining the defendant, during the pendency of the action, from selling any incandescent mantles “except such as shall he shown to have been coated by others,” can only be justified upon the theory that the patent for infringing which the suit was brought was a patent for a product or manufacture, and not one for a process. If it was a patent for a process, it would not be infringed by selling the product, and no conditions should have been annexed to the exercise of the vendor’s rights. The broad proposition that the vendor of a product whicii has been…