Samuel Colt, against IToung & Leavit. This case has occupied much of the public attention, inasmuch as the speeches of counsel were published in some of our daily papers. The plaintiflf was Samuel Colt, the well-know inventor of the fire-arms which bear his name, and the defendants were a well-known firm in this city. The plaintiff prayed for an injunction to restrain the defendants from infringing his patent. The case has been before the court in this city more than a single term. The presiding Judge Nelson reserved his decision until the 10th inst., when he gave it against the defendants and ordered an injunction. The defence set up was, that the invention laimed in the patent was not new, the main loint of which is that the breech is revolved ly drawing the trigger. This combination ot he revolving breech with the lock. Judge kelson considered to have been fully substan-iated as belonging to Colt—his invention. Colt's patent was extended for 7 years in 849, and has therefore four years to run be-[)re it expires. Col. Colt himself is now in Cngland with a number of American mecha-ics, to establish the manufacture of his fire-rms there, at the solicitations of the British [overnment.