Number | Name | Date | Kind |
---|---|---|---|
1832141 | Sheets | Nov 1931 | |
2258066 | Oyen | Oct 1941 | |
2636753 | Griffin | Apr 1953 | |
2825585 | Griffin | Mar 1958 | |
3359013 | Knox et al. | Dec 1967 | |
3870351 | Matsuki | Mar 1975 | |
4373754 | Bollfrass et al. | Feb 1983 | |
4377302 | Kohyama et al. | Mar 1983 | |
4384737 | Reusser | May 1983 | |
4410204 | Reimert | Oct 1983 | |
4433862 | Raulins et al. | Feb 1984 | |
4538840 | De Lange | Sep 1985 |
Number | Date | Country |
---|---|---|
1243605 | Jul 1967 | DEX |
2117469 | Oct 1983 | GBX |
Entry |
---|
Am. Petroleum Inst., "Drilling and Production Practice of 1949", copyright 1950, Author: Kelly, pp. 385, 387, 390. |