Filing Document | Filing Date | Country | Kind | 102e Date | 371c Date |
---|---|---|---|---|---|
PCT/SU85/00061 | 7/22/1985 | 3/20/1987 | 3/20/1987 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO87/00571 | 1/29/1987 |
Number | Name | Date | Kind |
---|---|---|---|
3999901 | Tschirky | Dec 1976 | |
4011917 | Tiraspolsky et al. | Mar 1977 |
Number | Date | Country |
---|---|---|
286502 | Apr 1969 | SUX |
Entry |
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"Downhole Screw Motors for Drilling Wells", Gusman and Baldenko et al., Nedra Publishers, Moscow, 1981. |
"Screw Drilling Motors", Drilling Series, Moscow, 1972. |