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Bob Ware
David L Johnson, Robert G Tinger, Robert A Ware, Sergei Yurchak: Fluid-bed aromatics alkylation with staged injection of alkylating agents. November 4, 2003: US06642426 (45 worldwide citation)

A system and process for producing xylene and other alkylated aromatics includes one or more fluidized bed reaction zones that provide contact between the reactants (i.e., an aromatic reactant and an alkylating reagent). Improved conversion and selectivity is realized when the alkylating reagent is ...


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Bob Ware
David L Johnson, Robert G Tinger, Robert A Ware, John S Buchanan, Xiaobing Feng, Shifang Luo, Gary D Mohr: Manufacture of xylenes using reformate. ExxonMobil Chemical Patents, Xiaobing Feng, October 10, 2006: US07119239 (9 worldwide citation)

A process is provided for the production of xylenes from reformate. The process is carried out by methylating under conditions effective for the methylation, the benzene/toluene present in the reformate outside the reforming loop, to produce a resulting product having a higher xylenes content than t ...


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Bob Ware
David L Johnson, Robert G Tinger, Robert A Ware, John S Buchanan, Xiaobing Feng, Shifang Luo, Gary D Mohr: Manufacture of xylenes using reformate. Exxonmobil Chemical Company, August 12, 2004: US20040158111-A1

A process is provided for the production of xylenes from reformate. The process is carried out by methylating under conditions effective for the methylation, the benzene/toluene present in the reformate outside the reforming loop, to produce a resulting product having a higher xylenes content than t ...


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Jack Levine, Priscilla C Brandt, Nydia Jackson, David L Johnson, Helen Clark: Method and apparatus for distributing currency. Visa International, Townsend and Townsend and Crew, December 19, 1995: US05477038 (491 worldwide citation)

A process which provides electronic access to pre-paid funds for cash or payment for goods and services. A card is issued to a customer with a value selectable by the customer. The card has a magnetic stripe with an encoded card number including a bank identification number (BIN) and an account numb ...


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Timothy M Lacey, David L Johnson: Programmable logic device. Cypress Semiconductor, Christopher P Maiorana PC, March 8, 2005: US06864710 (96 worldwide citation)

A programmable logic device comprising one or more horizontal routing channels, one or more vertical routing channels, and a logic element. Each logic element may be configured to connect between one of the horizontal routing channels and one of the vertical routing channels. The logic element may c ...


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Robert B Carpenter, David L Johnson: Method and spacer fluid composition for displacing drilling fluid from a wellbore. Atlantic Richfield Company, F Lindsey Scott, February 2, 1999: US05866517 (94 worldwide citation)

Spacer fluids comprising a dispersant selected from the group consisting of water soluble polymers comprising allyloxybenzene sulfonate or allyloxybenzene phosphonate polymerized with at least one of acrylic acid, acrylamides, alkyl acrylamides, maleic anhydride, itaconic acid, sulfonated or phospho ...


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Robert B Carpenter, David L Johnson: Method and cement-drilling fluid cement composition for cementing a wellbore. Atlantic Richfield Company, F Lindsey Scott, February 23, 1999: US05874387 (85 worldwide citation)

A method and a drilling fluid/cement slurry composition for cementing a wellbore. The drilling fluid/cement slurry composition comprises A cement slurry composition comprising:


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Robert B Carpenter, J Michael Wilson, Bill W Loughridge, David L Johnson, Krishna M Ravi, Richard R Jones: Well completion spacer fluids and methods. Halliburton Company, Atlantic Richfield Company, Craig W Roddy, C Clark Dougherty Jr, August 4, 1998: US05789352 (76 worldwide citation)

A well completion spacer fluid is provided which is particularly suitable for separating a cement slurry from drilling fluid in primary cementing operations. The well completion spacer fluid is also useful for separating other potentially incompatible fluids in the wellbore, such as, separating dril ...


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Brian E Hornby, David L Johnson: Borehole logging method for fracture detection and evaluation. Schlumberger Technology Corporation, Clifford L Tager, David G Coker, Louis H Reens, May 16, 1989: US04831600 (67 worldwide citation)

In a method for locating fractures in subsurface earth formations traversed by a borehole a first signal is generated representative of low frequency Stoneley waves (that is tube waves) propagating along the borehole from a source mounted in a logging tool. A second signal is generated by an array o ...