2—All letters must be addressed to the Minister of the Interior.
3—Freight, postage or other charges on matter sent to the office must be prepaid in full. Otherwise it will not be received.
4—The correspondence of the office will be held with the applicant, unless he shall have appointed an attorney to represent him, or unless he shall have assigned the entire interest of his invention, in either of which cases the correspondence will be held with such attorney or such assignee.
5—A separate letter, should in every case, be written in relation to each distinct subject of inquiry or application.
INFORMATION TO CORRESPONDENTS.
6—The office cannot respond to inquiries as to the novelty of an alleged invention in advance of an application for a patent.
7—Caveats, and pending applications, are preserved in secrecy. No information will be given respecting the filing of any caveat or application for a patent without authority from the applicant, unless it shall be necessary to the proper conduct of business before the office.
8—After a patent has been issued, the model, specification and drawings are subject to general inspection, and copies, except of the model, will be furnished on the terms published with these rules.
ATTORNEYS.