To the North Pole by Balloon. The East River Bridge. INTERFERENCE CASE—DECISION OF THE COMMISSIONER OF PATENTS. Commissioner Fisher has just rendered a decision in the interference .case of Townsend vs. Fowle for an improvement in submarine drilling appara Ms which reviews the general theory of interference so full and clear that we give the decision'complete. Cases of interference may be naturally divided into two leading classes The first comprises those in which the applicants are both original and in dependent inventors and the only question for decision is which was the first inventor? The parties in this class of cases may be and usually are widely separate and have no connection whatever with each other. The coincidence of invention is accidental or rather resultsfrom the fact that the improvement is one which is demanded by the state of the arts and one which many men are seeking at the same time to discover or develop. The question of priority In these cases is usually one of easy solution. It Is to be determinee by ascertaining which of the parties first reduced the invention to practical form either by a drawing sufficient of itself to en however explicit in details unless such conversati ns were directed to workmen to construct the machine and it was actually built at the time from such directions. The second class of interferences comprises those cases in which twe men have been more or less connected in the work of invention when the W have in some form existed. When the invention if it is the act of both takes place at the same time and when the real ouestion is not so much one of' priority as of originality ; when in short it is charged or inferred that one of the parties is in fact claiming that which he has taken from the other to whom it rightfully belongs. This class may be again subdivided into three : First where the parties are fellow-townsmen or workmen or course of hisworkmade some improvement upon the tools or method with other to assist
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