Title:
Tool-joints for drilling strings
United States Patent 3419289


Inventors:
Ioan, Lari
Application Number:
US67658567A
Publication Date:
12/31/1968
Filing Date:
10/19/1967
Assignee:
Mini, Petrolului
Primary Class:
Other Classes:
285/315, 285/317, 285/347
International Classes:
E21B17/046; F16D1/02; F16L37/138
View Patent Images:
US Patent References:
3252721Slide lock for releasably connecting shaft elements1966-05-24
2314867Semithreadless drill stem1943-03-30
2297548Coupler1942-09-29
1509651Coupling1924-09-23