Kammerdiner

Suit for patent infringement. Plaintiff is the owner by assignment from the patentee, Robert McDonald Pyles, of patent No. 1,683,096, application for which was filed May 2,1921, and patent issued September i, 1928. It is for a rotary jar, a mechanism used in rotary drilling of oil wells for dislodging and recovering tools lost or stuck in the well, and is designed to loosen the obstruction by force applied suddenly; that is, by jarring it. Henee it is called a “jar” in the oil well drilling trade. Plaintiffs’ device is called the “Pyles jar.”

The tool is used after the obstruction, whether it be drill bit, casing, or other form of obstruction, has become frozen or fastened in the hole. It is constructed with a tubular section and a plunger section moving longitudinally within the tubular section during the jarring movement, and with means to permit a rotary movement when necessary. Means exist to provide a water circulating opening in the plunger, for in rotary drilling it is necessary that fluid mud be circulated down the drill pipe to keep the bit that is operating on the formation clean and to carry the cuttings from the bit out of the hole. The obstruction, or “fish,” as it…