Home/Ninth Circuit/Keszthelyi v. Doheny Stone Drill Co.

Keszthelyi v. Doheny Stone Drill Co.

59 F.2d 3, 13 U.S.P.Q. (BNA) 427, 1932 U.S. App. LEXIS 3294
CourtCourt of Appeals for the Ninth Circuit
DecidedMay 23, 1932
DocketNo. 6688
StatusPublished
Cited by9 cases

This text of 59 F.2d 3 (Keszthelyi v. Doheny Stone Drill Co.) is published on Counsel Stack Legal Research, covering Court of Appeals for the Ninth Circuit primary law. Counsel Stack provides free access to over 12 million legal documents including statutes, case law, regulations, and constitutions.

Bluebook
Keszthelyi v. Doheny Stone Drill Co., 59 F.2d 3, 13 U.S.P.Q. (BNA) 427, 1932 U.S. App. LEXIS 3294 (9th Cir. 1932).

Opinion

WILBUR, Circuit Judge.

' This is an appeal from a final decree of the District Court in favor of appellees in a suit in equity for infringement of letters patent No. 1,474,905 issued to appellant on November 20, 1923, for a new and useful improvement in tool joints used in rotary drilling of oil wells.

In his patent specifications appellant explains that in rotary drilling the bit cutting the formation is carried at the lower end of the string of drill pipe; that in order to withdraw the bit for sharpening or replacement, it is necessary to pull up the drill pipe, uncoupling it at intervals usually of three or four lengths of the pipe, for convenience in handling; that it is therefore necessary to provide a tool joint at such intervals to prevent injuring the threads of the pipe by frequent coupling and uncoupling; that one of the operations in rotary drilling is to pump a stream of mud laden fluid down through the drill pipe and through the bit, and to do this it' is necessary to apply considerable pressure at the upper end of the drill pipe so that in the ordinary type of tool joint it is difficult to insure tight joints which will withstand the pressure necessarily applied; that tool joints as ordinarily constructed, consist of a pair of steel collars, one of whieh is screwed upon each of the'contraeting ends of the drill pipe, using the threads with which the pipe is ordinarily provided; that one of the collars has a pipé or pin with a steep taper and coarse threads and the other collar having a box into whieh this pipe or pin is threaded; that it is the common practice to set up these tool joints by the use of the power driven rotary table so that the friction on the threads between the box and the pin is very great, sometimes causing the box to spread so that it is not an uncommon thing for the joints to become loose or even unscrewed. The objects of the patent in suit as stated by appellant in his specifications are “to provide a novel form of tool joint in whieh the friction on the threads is not entirely depended upon to hold the joint together but supplemental frictional means are provided for this purpose” and “to provide auxiliary means of insuring a tight joint at all times.”

The following drawing, being Fig. 1 in the patent, shows a form of appellant’s device most nearly like that of the appellees:

dt.

graphs, the first showing the couplings connected and the second showing them separated:

[5]*5

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Bluebook (online)
59 F.2d 3, 13 U.S.P.Q. (BNA) 427, 1932 U.S. App. LEXIS 3294, Counsel Stack Legal Research, https://law.counselstack.com/opinion/keszthelyi-v-doheny-stone-drill-co-ca9-1932.