Number | Name | Date | Kind |
---|---|---|---|
2831549 | Alpert | Apr 1958 | |
3130563 | Wood et al. | Apr 1964 | |
3256706 | Hansen | Jun 1966 | |
3309844 | Hemstreet et al. | Mar 1967 | |
3335550 | Stern | Aug 1967 | |
3416326 | Stuffer | Dec 1968 | |
3490247 | Wing | Jan 1970 | |
3502596 | Sowards | Mar 1970 | |
4198829 | Carle | Apr 1980 | |
4295338 | Welch | Oct 1981 |
Entry |
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Liu et al.; "On Cryosorption Pumping of Hydrogen with the ZDB-150 Type Cryopump Cooled by a Two Stage Closed-Cycle Refrigerator" Journal of Vacuum Science Technology, vol. 20, No. 4, Apr. 1982, pp. 1000-1004. |