Fill each of the numbered blanks in the passage below with one suitable word. (10 points) A patient is a government grant (1) certain exclusive (2) to (3) inventor who chooses to make his invention public. A patent in the United States is granted (4) seventeen years. During this time, other people are prevented (5) making, using or selling the (6) without the permission of the (7). When this period ends, anyone can use the invention. The United (8) Patent Office, an agency of the Department of Commerce (9) Washington, is (10) for administering the patent laws. The Commissioner of Patents is appointed (11) the president of the United States. (12) than one thousand patent examiners, all of whom are (13) with technical training, work in the Patent Office. The examiners study applications (14) determine whether the (15) has followed the established rules and patent laws.