Abstract: A process for improving the fillet-forming capability of brazeable aluminum articles includes providing a brazeable aluminum article, having at least one surface; and contacting the surface with a dilute, aqueous solution of fluoridic compounds, for at least 5 seconds at a temperature ranging from about 150.degree. to 212.degree. F. to produce an oxide-free surface which can be readily brazed with a minimal drip loss.

Abstract: An automotive space frame joining system. The joining system includes a pair of extruded aluminum alloy lineal hollow rectangular members, the first lineal member having a top end, a bottom end and two opposing sides, each opposing side including a plurality of substantially similar longitudinal grooves running from the bottom end towards the to end of the first lineal member, the second lineal member having a top and a bottom longitudinal surface, the bottom end of the first lineal member abutting the top lineal surface of the second lineal member; and two pair of universal joining members, each joining member comprising a span and an interlocking member attached to the span, each pair fastened to opposing sides of the second lineal member and positioned such that each interlocking members of each joining member provides interlocking engagement within the opposing grooves of the first lineal member, thereby providing a space frame exhibiting great strength.

Abstract: We provide a graded catalyst system which is used for removing calcium and sodium from hydrocarbon feed having at least 1 ppm calcium and 1 ppm sodium. It comprises two catalyst zones characterized as having decreasing porosity, increasing activity, and increasing surface to volume ratio in the direction of feed flow through the system. We also disclose a process for using it and a method for selecting catalyst for use therein.

Abstract: We provide reverse-graded catalyst systems which are capable of removing metals and sulfur from a hydrocarbon feedstock. They comprise two or more catalyst layers in which at least two successive catalyst layers characterized as having decreasing desulfurization activity, and increasing average macropore diameter in the direction of hydrocarbon flow. We also disclose a process for using them.

Abstract: A process for dewaxing and stabilizing a hydrocracked bright stock, comprising hydrodenitrification, catalytic dewaxing, and mild hydrofinishing.

Abstract: A process for stabilizing a lubricating oil base stock derived from a nitro-aromatic-containing hydrocracked bright stock, comprising a two-step stabilizing process utilizing hydrodenitrification followed by mild hydrofinishing.