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Construction
Class Information
Number:
175/328
Name:
Boring or penetrating the earth
>
Bit or bit element
> Magnetized or with magnet
Description:
Apparatus in which the bit is provided with a magnet or with a magnetized portion.
Patents under this class:
Patent Number
Title Of Patent
Date Issued
6491117
Apparatus for retrieving metal debris from a well bore
Dec. 10, 2002
6357539
Apparatus for retrieving metal objects from a wellbore
Mar. 19, 2002
6354386
Apparatus for retrieving metal objects from a wellbore
Mar. 12, 2002
6308781
Apparatus for retrieving metal objects from a wellbore
Oct. 30, 2001
6216787
Apparatus for retrieving metal objects from a wellbore
Apr. 17, 2001
4296822
Multipurpose fluid flow assisted downhole tool
Oct. 27, 1981
4226285
Magnetic junk retriever
Oct. 7, 1980
4125167
Big hole bit
Nov. 14, 1978
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