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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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Class Information
Number: 175/135
Name: Boring or penetrating the earth > With above-ground means to impact an earth-penetrating means
Description: Apparatus combined with an above ground hammer to deliver, or cause to be delivered an impact or blow to an earth boring means.










Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
4522273 Drilling rig Jun. 11, 1985
4387775 Rock drilling apparatus Jun. 14, 1983
4385668 Inner pipe support arrangement for double-walled drill pipe May. 31, 1983
4335622 Soil gas probe Jun. 22, 1982
4319784 Apparatus for water jet and impact drilling and mining Mar. 16, 1982
4232752 Method and apparatus for driving pipe Nov. 11, 1980
3977480 Arrangement for exchanging drill bits Aug. 31, 1976
3977479 Geological exploration method and apparatus Aug. 31, 1976

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