Abstract: Liquid chromatographic processing of compositions containing ionizable compounds. The chromatographic column is formed of a stationary packing having a chemical group chemically bonded thereto and a counter ion is added to the polar mobile liquid. The counter ion forms a reversible complex with at least one characterizing radical of at least one of the ionizable compounds.

Abstract: Apparatus for selective electroplating of discreet areas of strips intermittently advanced through said apparatus. A particularly important aspect of the apparatus is the means whereby the strip is advanced intermittently but is, at all times, held under tension by a dual-clutch arrangement comprising two indexing wheels, a drag clutch positioned to control tension on a first wheel at one side of the electroplating bath, and another indexing wheel intermittently operated to advance the strip on intermittent engagement by controlled by a second clutch mechanism.

Abstract: A package comprising a dessicant material consisting essentially of 1 a dessicant and 2 tough, film-forming, resin having a high moisture vapor transmission rate. A prepolymerized polyurethane is particularly useful. The material is of particular value as a package insert - e.g. with film or cameras or as a coating material which can be utilized on equipment to be protected or, most advantageously, on the interior walls of packaging boxes and the like.

Abstract: A plate-like structure comprising a liquid flow path formed in one face thereof, a thin ductile seal-forming coating on the face of the structure which forms the flow path. The structure finds many utilities, most advantageously in constructing a novel valve wherein the disk is flexible and adapted for flexing a central face portion thereof against a conduit, thereby sealing said conduit.

Abstract: In a method for making hot melt adhesive sticks and other shapes for subsequent use in hot melted adhesive applicators, a charge of a hot melt adhesive is injected into one end of a cooling chamber, the opposite end of the chamber being sealed by a solid plug from a previous adhesive charge. This first charge is maintained under pressure until its outside wall forms and sets so that any shrinkage occurs at the end of the charge. That shortage is made up when the next charge of hot melt adhesive is injected into the chamber. If the first charge has not set sufficiently to be self-supporting, the pressure of the next charge balloons the soft side walls of the insufficiently set charge outward against the chamber walls so that that charge does not move along the chamber, but remains for another complete cycle of operation until it is ready. Thus each adhesive stick ejecting from the opposite end of the chamber is uniform, accurately dimensional and solid.

Abstract: Novel end fitting assemblies of particular advantage for use on liquid chromatographic columns, and novel chromatographic columns comprising these novel end fittings. The end-fittings are characterized by (a) very low dead space; (b) economical and convenient replacement of wearing parts; with minimal disturbing of the packed column, or other functional end-fitting components such as cones, filters, etc. A particular advantage is the design whereby the connector portions of the fitting assembly are not normally wetted by process fluids during operation of the column. Thus, the connector portions of the assemblies can be selected from a wide variety of mechanically-desirable materials selected for their wearing characteristics. Moreover, the fittings can be tightened for high-pressure operation without damage to the structure of the column of which they are used.

Abstract: Magnetic tape having extraordinary performance characteristics and formed with a sparingly-crosslinked, polyurethane-based polymer binder system as a matrix for magnetic particles. The binder system is characterized by toughness of at least 150 in-lbs. per in.sup.3, and the ability to withstand video tape-Test for over an hour before any substantial tape degradation occurs. Magnetic coatings prepared according to the invention comprise a binder system of at least 50% of a tough polyurethane.

Abstract: Novel photometric apparatus advantageously having a conical shaped flow-cell comprising a light source proximate the narrow end and a photosensitive detector at the wider end of the cell. The flow-cell adequately compensates for a lens effect that has been discovered to be a substantial factor in electro-magnetic energy absorption studies on liquid streams.

Abstract: Improved processes and products based on the discovery that metal atoms in complex relationship with complexing agents can be used to moderate the formation of organic salt seed crystals which promote an exceptionally well-ordered acicular growth of organometallic salts such as oxalates of the metal. Some acicular, i.e. needle-like, products have particular utility for being reduced to ferromagnetic metal particles which retain a surprisingly large degree of acicularity and possess extraordinarily favorable properties for use in magnetic recording applications.

Abstract: An improved contouring tool, advantageously used as a skate sharpening machine, comprising means to vary the contour of the skating blade with respect to its longitudinal arc and also with respect to the centering of the arc. The sharpener of the invention also advantageously incorporates a novel low-friction surface over which a skateholder may be manipulated and a novel skate positioning and bent-blade detection means.

Abstract: An improved fluid-operated dispensing apparatus for use in receiving, processing, and applying rods of hot-melt adhesive. Important characteristics of the apparatus include an air-cooling means adapted to operate when the dispensing function is not being operated, and a means for gripping the adhesive rod to assure a uniform advance through the apparatus to the heating zone. Moreover, the use of a drive piston assembly, which is annular with respect to the rod being processed, enables the manufacture of an unusually compact tool.

Abstract: A quick-fastening and compact machine stop of the type used to aid machine operators in positioning of work on machine tools for precision machining operations. The novel machine stop is characterized by a biased neutral adjust mode and a screw-advanced cam surface which engages another cam at an angle to achieve a locking mode in which a plurality of clamp-effecting force vectors are achieved.

Abstract: A compact pumping system especially useful in liquid chromatography wherein comprising a liquid path which is fully flushed on each stroke of a pump, a pump which provides substantially pulse-free flow, a pressure-sensor integrated into said flow path and operably connected to the control circuit of a bifilar stepping motor. This circuit is so designed that the driving current applied to the motor is only that required to pump the liquid. The avoiding of heat associated with a greater current is particularly important in forming a compact package of motor and pump for use in liquid chromatography.

Abstract: An improved magnetic tape having the property of retaining magnetic data even when spooled and subjected to high temperature environments. This thermal resistance is suitably achieved by providing a backing coating which contacts the magnetic-particle-bearing facing coating of the tape and is chemically incompatible therewith. Pairs of chemically-incompatible coatings include polyester polyurethane-polyether-polyurethane; polyfluorinated hydrocarbons-polyurethane. A conductive furnace carbon black is advantageously used in the backing coating, and the substrate is, suitably, temperature-resistant polyimide.