Number | Name | Date | Kind |
---|---|---|---|
2655442 | Mayland | Oct 1953 | |
2815331 | Ashley et al. | Dec 1957 | |
2892685 | Paull | Jun 1959 | |
3361534 | Johnson et al. | Jan 1968 | |
3545926 | Schlinger et al. | Dec 1970 | |
3684689 | Patton et al. | Aug 1972 |
Entry |
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Catalyst Handbook (1970), Springer-Verlay N.Y. Inc., N.Y., pp. 102 & 103. |