Description
EARTH OR ROCK DRILLING (mining, quarrying E21C; making shafts, driving galleries or tunnels E21D); OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
E21B
Technology
Sub-Class
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- 0 36378 US PATENTS IN FORCE
- 9549 US APPLICATIONS PENDING
- 9209 Total Patent Owners
- 63315 TOTAL INVENTORS
Subclasses
| Subclass | Title |
|---|---|
| 1/00 | Percussion drilling (drives used in the borehole E21B 4/00) |
| 1/02 | Percussion drilling (drives used in the borehole E21B 4/00) Surface drives for drop hammers, e.g. with a cable |
| 1/04 | Percussion drilling (drives used in the borehole E21B 4/00) Surface drives for drop hammers, e.g. with a cable Devices for reversing the movement of the rod or cable at the surface |
| 1/12 | Percussion drilling (drives used in the borehole E21B 4/00) with a reciprocating impulse member (E21B 1/02, E21B 1/38 take precedence) |
| 1/14 | Percussion drilling (drives used in the borehole E21B 4/00) with a reciprocating impulse member (E21B 1/02, E21B 1/38 take precedence) driven by a rotating mechanism |
Recent Patents
Not AvailableRecent Publications
Not AvailableTop Owners in This Class
Top Owners in This Subclass
Applications Filed in This Class - By Year
Applications Filed in This Subclass - By Year
Patents Issued To Date - By Filing Year
Average Time to Issuance
- 35 Months (last 2 years Issuances)
- 35 Months (last 5 years Issuances)
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