Methane Drainage Ventures
9Patents
0Active
9Granted
27Portfolio score
Filing activity: Sep 20, 1982 → Jun 13, 1986
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4651836A | Process for recovering methane gas from subterranean coalseams | Fixed Constructions | 143 | Expired |
| US4611855A | Multiple level methane drainage method | Fixed Constructions | 81 | Expired |
| US4600061A | In-shaft drilling method for recovery of gas from subterranean formations | Fixed Constructions | 67 | Expired |
| US4533182A | Process for production of oil and gas through horizontal drainholes from underground workings | Fixed Constructions | 60 | Expired |
| US4452489A | Multiple level methane drainage shaft method | Fixed Constructions | 5 | Expired |
| US4484643A | Gas-liquid-solids separation system | Fixed Constructions | 4 | Expired |
| US4687060A | Production and grout liner for methane drainage in subterranean boreholes and method | Fixed Constructions | 3 | Expired |
| US4691789A | Process for establishing a clear horizontal borehole in a subterranean formation | Fixed Constructions | 2 | Expired |
| US4624328A | In-shaft drilling apparatus for recovery of gas from subterranean formations | Fixed Constructions | 1 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.