Another advantage to searching for patents on a service like FreePatentsOnline (http://www.freepatentsonline.com/) is that viewing the full patent, including images, is much easier than on the USPTO site. Searching for recent Conoco Phillips patents with the key words desulfurization OR dibenzothiophene resulted in one hit, shown below. By clicking on the hyperlink, the full text of the patent came up. By logging into your free FreePatentsOnline account, you can pull up the images, as well.
SEARCH STATEMENT
AN/conoco$ and (SPEC/desulfurization OR SPEC/dibenzothiophene) and ISD/1/1/2005->6/1/2009
RESULTS
7182918
Desulfurization process A hydrocarbon desulfurization system that circulates fluidizable solid particles through a fluidized bed reactor, a fluidized bed regenerator, and a fluidized bed reducer to thereby provide for...
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