Description
Class E21B : EARTH OR ROCK DRILLING
Subclass 1/22: 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 electromagnets
E21B 1/22
Sub-Class
Stats
- 4 US PATENTS IN FORCE
- 0 US APPLICATIONS PENDING
- 4 Total Patent Owners
- 21 TOTAL INVENTORS
Recent Patents
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 11834925 | Wellhead-side-outlet contingency valve removal plug adaptor assembly | Nov 02, 21 | Dec 05, 23 | Saudi Arabian Oil Company |
| 9463562 | Motor driven hammer having means for controlling the power of impact | Jul 15, 10 | Oct 11, 16 | BLACK & DECKER INC. |
| 9080386 | Magnetic gear for use with wellbore instruments | Sep 10, 12 | Jul 14, 15 | MAGNOMATICS LIMITED, ZI-LIFT, LTD., |
| 6089526 | Ram type blowout preventor | Apr 09, 98 | Jul 18, 00 | COOPER CAMERON CORPORATION |
Recent Publications
Not Available
Top Owners in This Subclass
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Patents Issued To Date - By Filing Year
Average Time to Issuance
- 40 Months (last 2 years Issuances)
- 40 Months (last 5 years Issuances)