1. Anand, M., Rao, M. B. and Sircar, S. (1995) Hydrogenrecovery by adsorbent membranes. US Patent 5,435,836.
2. Doshi, K. J. (1983) Enhanced hydrogen recovery from low purity purge gas streams. US Patent 4,398,926.
3. Doshi, K. J. (1987a) Enhanced gas separation. US Patent 4,645,516.
4. Doshi, K. J. (1987b) Enhanced gas separation. US Patent 4,690,695.
5. Doshi, K. J. (1988) Integrated pressure swing adsorption/membrane separation process. US Patent 4,783,203.