ALEXANDRIA, Va., May 27 -- Shell Oil, Houston, has been assigned a patent (9,346,042) developed by five co-inventors for a "process for regeneration of ionic liquid catalyst." The co-inventors are Rui Zhang, Beijing, Zhichang Liu, Beijing, Chunming Xu, Beijing, Xianghai Meng, Beijing, and Peter Anton August Klusener, Amsterdam.

The patent application was filed on Dec. 28, 2012 (14/369,215). The full-text of the patent can be found at http://patft.uspto.gov/netacgi/nph-Parser?Sect1 . . .