Well tool
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 19, 1983
Grant Date -
N/A
app pub date -
Oct 31, 1980
filing date -
Oct 31, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A well tool, such as a drilling pipe string, whose joints are provided with tubular protectors which are restrained against vertical movement on the joints while permitting rotation of the drilling pipe string relative thereto when the protectors engage the internal surfaces of a well bore or of a well casing through which the drilling pipe string extends.
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Cited Art Landscape
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