Number | Name | Date | Kind |
---|---|---|---|
2815320 | Kollsman | Dec 1957 | |
3810969 | Schlumberger | May 1974 | |
4454012 | Bachot et al. | Jun 1984 | |
4470888 | Wheaton | Sep 1984 | |
4683039 | Twardowski et al. | Jul 1987 | |
4798715 | Hardee et al. | Jan 1989 | |
4806215 | Twardowski | Feb 1989 | |
4915927 | Lipsztajn et al. | Apr 1990 |
Entry |
---|
Ullmann's Encyclopedia of Industrial Chemistry, vol. A6, p. 497 (1986). |