PATENT, PRUSSIAN. This subject will be considered by taking a view of the persons who may obtain patents; the nature of the patent; and the duration of the right.

2. - §1, Of the persons who may obtain patents. Prussian citizens or subjects are alone entitled to a patent. Foreigners can not obtain one.

3. - §2. Nature of the patents. Patents are granted in Prussia for an invention when the thing has been discovered or invented by the applicant. For an improvement, when considerable improvement has been made to a thing before known. And for importation, when the thing has been brought from a foreign country and put in use in the kingdom. Patents may extend over the whole country or only over a particular part.

4. - §3. Duration of patents. The patent may at the choice of the applicant, be for any period not less than six months nor more than fifteen years.

PATENT, ROMAN. The Roman patents will be considered by taking a view of the persons to whom they may be granted; the different kinds of patents; the cost of a patent; and the obligations of thepatentee.

2. - §1. To whom patents are granted. Every person, whether a citizen of the estates of the pope or foreigner, man or woman, adult or infant, may obtain a patent for an invention, for an improvement, or for importation, by fulfilling the conditions prescribed in order to obtain a grant of such titles. Persons who have received a patent from the Roman government may, afterwards, without any compromise of their rights or privileges, receive a patent in a foregn country.

3. The different kinds of patents. In the Roman estates there are granted patents for invention, for improvements, and for importations.

4. - 1st. Patents for inventions are granted for, 1. A new kind of important culture. 2. A new and useful art, before unknown. 3. A new and useful process of culture or of manufacture. 4. A new natural production. 5. A new application of a means already, known.

5. - 2d. Patents for improvements may be granted for any useful improvement made to inventions already known and used in the Roman states.

6. - 3d, Patents for importations are granted in two cases, namely: 1. For the introduction of inventions already patented in a foreign country, and the privilege of which patent yet continues. 2. For the introduction of an invention known and freely used in a foreign country, but not yet used or known in the Roman states.

7. - 3. Cost of a patent. The cost of a patent is fixed at a certain sum per annum, without regard to the length of time for which it may have been granted. It varies in relation to patents for inventions and importation. It is ten Roman crowns per annum for a patent for invention and improvement, and of fifteen crowns a year for a patent for importation.

8. - §4. Obligation of the patentee. He is required to bring into uue his invention within one year after the grant of the patent, and not to suspend the supply for the space of one year during the time the privilege shall last.

9. He is required to pay one balf of the tax or expense of his patent on receiving his patent, and the other half during the first month of the second portion of its, duration.