Boring or penetrating the earth – With tool shaft detail – Shaft carried guide or protector
Reexamination Certificate
2006-04-18
2006-04-18
Neuder, William (Department: 3672)
Boring or penetrating the earth
With tool shaft detail
Shaft carried guide or protector
C166S242600
Reexamination Certificate
active
07028788
ABSTRACT:
Wear sleeve for a drill pipe coupling (10), where a sleeve (18) is arranged in a drill pipe coupling on one of the two adjoining, coupled together drill pipes (12, 14) in a drill string, where the sleeve has an outer diameter that is larger than the outer diameter of the drill pipe coupling (10) and which comprises an inner continuous bore. The inner bore comprises a threaded section (22a) arranged for joining together with a corresponding outer threaded section (22) at the one end of the drill pipe coupling (10), whereupon the sleeve (18) is arranged to be securely fastened in the drill pipe coupling to form a wear sleeve.
REFERENCES:
patent: 2301495 (1942-11-01), Abegg
patent: 2336974 (1943-12-01), Abegg
patent: 2440441 (1948-04-01), Hanes
patent: 3754609 (1973-08-01), Garrett
patent: 3923324 (1975-12-01), Cruickshank et al.
patent: 5090500 (1992-02-01), Yousef et al.
Nilsen Per Gunnar
Strand Stein
Vaalana Atle Stlan
Carella Byrne Bain et al
Hand Francis C.
Tubular Protection Systems AS
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