Abstract: A composite thin film resistor is disclosed, including an electrically inert substrate upon which is deposited a nickel-chromium alloy thin film, and an overlying second thin film -- which is initially deposited as metallic tantalum. In the final product the tantalum is passivated, as by thermal oxidation, so that the said film is substantially tantalum oxide throughout, except where such film underlies a pair of conductive terminal pads. The terminal pads are spaced on the substrate, so that the resistive path therebetween is defined through the nickel-chromium thin film -- via the thin metallic tantalum film interfacing between the nickel-chromium film and conductive pads. The overlying tantalum oxide provides a very high degree of environmental protection with respect to the Ni--Cr film, whereby the product not only displays the desirably low TCR characteristics of Ni--Cr, but is also highly resistant to moisture and other environmental factors.

Abstract: A tracheal tube adapted for insertion into the trachea of a patient for introducing or removing gas. The tube includes a main inflatable cuff which surrounds the distal end of the tube. A gas passageway communicates at one end with the interior of the cuff, and the other end of the passageway is adapted to receive an inflating means, for delivering gas to inflate the cuff. The gas passageway includes a check valve, and a generally oval pilot balloon is in gas communication with the cuff via the passageway. The pilot balloon is longitudinally pre-stretched between its opposite end portions by means maintaining the pre-stretched condition. Accordingly the balloon in its non-inflated condition is characterized by a series of mutually spaced folds, extending longitudinally between the opposed ends. The ridges of the folds contrast with the troughs between folds, to provide a series of spaced, visually discernible markings which visually signal the non-inflated condition of the main cuff.

Abstract: An automatic switchover valve is described having a unique venting system whereby any areas which may cause a buildup in pressure during shuttling are normally vented to atmosphere. The shuttle is of a simple, easy to manufacture design having a central inwardly tapered portion which allows communication with internal parts of the valve to atmosphere. The valve also features sealing means which seal against moving surfaces without being subjected to rubbing on sharp surfaces or orifices, thus prolonging seal life.

Abstract: An instrument for withdrawing equilibrated blood gases in vivo, which comprises a tubular gas permeable membrane inserted through a cannular into the blood stream. In preferred form, the tubular membrane comprises a continuous conduit in contact with the blood. An inlet supply gas terminal is constructed for connection to a carrier gas source, and an outlet gas terminal, for connection to an appropriate analyzer. In preferred forms of the invention, a heater maintains the equilibrated gases at above normal body temperature as they pass to the analyzer; and a port is provided for drawing blood samples from the area being analyzed without dislodging the catheter.

Abstract: Cyclic ether compounds of the formula ##STR1## wherein n is zero or one, and each X is F when n is zero and is H when n is one, are useful as inhalation anesthetics.

Abstract: Apparatus for providing an expendable refrigerant which is emitted from a snow horn at a low velocity thereby enabling snow agglomeration at a close proximity to the horn exit and accurately delivering a charge of snow with minimum vapor loss. The desired snow is produced by introduction of the relatively warm liquid refrigerant into an insulated compartment and in heat exchange relation with a tube therein having a plurality of length/diameter ratios. The liquid refrigerant is effective to warm the tube walls and results in a slight cooling of such liquid which is then passed to a subcooler and returned to the tube inlet for expansion in several stages therein to form the snow. The product snow is emitted from this horn at a relatively low velocity and may be accurately directed into cavities of such products as eviscerated fowl.

Abstract: A method and apparatus for coating a substrate with a layer of polymerized material by simultaneous glow discharge polymerization and sputtering is disclosed. A substrate and two electrodes are placed in a chamber which can be evacuated. An appropriate pressure of a gas which can form a polymer is introduced into the chamber. A glow discharge is established in the gas. Molecules of starting gas and reactive species created in the glow discharge deposit on the electrodes and on the substrate. Material deposited on at least one of the electrodes is sputtered onto the substrate by applying an electric potential, preferably an AC potential, across the electrodes. The glow discharge is preferably confined to a region adjacent to the sputtered electrode. This confinement may be accomplished by the use of a planar magnetron sputtering cathode. The method and apparatus disclosed allow the rapid deposition of high quality polymeric coatings at low gas pressures.

Abstract: A system for separating, concentrating and storing radioactive krypton and xenon in the off-gases from a boiling water reactor, wherein adsorption and cryogenic distillation are both efficiently used for rapid and positive separation and removal of the radioactive noble gases, and for limiting such gases in circulation in the system to low inventory at all times, and wherein the system is self-regulating to eliminate operator options or attention.

Abstract: An improved graphite nipple for connecting contiguous lengths of graphite furnace electrodes. The nipple is of the type having a reservoir for a thread locking pitch composition. The reservoir contains a heat-foamable, thermoplastic material including particulate pitch in a lignin sulfonate-based binder. The composition may be deposited into the reservoirs of the nipples by direct extrusion at ambient temperatures. When a nipple thus prepared is utilized in an electrode joint assembly, the high temperatures provided at the electrode joint foam the composition to expand it into adjacent thread spaces at the joint. Continued heating then carbonizes the composition to lock the joint.

Abstract: Apparatus for providing density compensation to measured volumes of fluid flow wherein means for sensing the fluid parameter having a dominant effect on the density thereof are adapted to produce an output signal which varies as a function of the magnitude of the sensed parameter. This output signal is supplied to a voltage-frequency converter which produces output pulses continually at a frequency corresponding to the magnitude of the output signal. The converter is gated to a coincidence gate for a period of predetermined duration upon detection of each unit change of volumetric fluid flow with the number of pulses accepted by the gate during such period reflecting the value of the dominant parameter and, hence density of the fluid. A frequency divider is configured to divide the gate output by a predetermined factor with each output pulse or count issued by the frequency divider representing a density corrected unit change of volumetric fluid flow.

Abstract: Mechanism for lifting a substrate holder from its carrier platform and rotating the holder during substrate coating, comprises a main assembly including a permanent magnet and concentric stripping ring, an actuating piston for lowering the assembly so that the magnet and stripping ring overlie a magnetic part of the substrate holder, and for raising the assembly with coupled magnet and holder above the carrier, a spring belt transmission for rotating the magnet and holder, an auxiliary actuating piston separately connected to the magnet within the main assembly whereby upon lowering of the main assembly with holder to the carrier platform after substrate rotation, the holder can be stripped from the magnet by independent vertical actuation of the magnet piston relative to the overlying stripping ring.

Abstract: Dense round rods are obtained by placing an uncompacted particle mass into a mold containing a cavity of a predetermined geometry. The particle mass is subjected to a heating schedule wherein entrapped gases are permitted to pass off during an initial period of the schedule and during a second period of the schedule at least 75% liquid phase is formed, whereby surface tension forces cause the particle mass top portion to attain a hemispherical shape. The heated mass is permitted to cool and a round product is obtained.

Abstract: Aliphatic ether compounds of the formula ##EQU1## wherein n is zero or one, and --X is --CF.sub.3 or --H when n is zero and is --OCH.sub.3 when n is one, are useful as inhalation anesthetics.

Abstract: Aliphatic ether compounds of the formula ##EQU1## wherein Z is CH.sub.3 or Cl, and n is zero when Z is CH.sub.3 and is one when Z is Cl, are useful as inhalation anesthetics.

Abstract: This disclosure is directed to novel ethers of the formula:CF.sub.3 CH.sub.a X.sub.b --O--CF.sub.2 CH.sub.c F.sub.d Cl.sub.ewherein X is fluorine, chlorine or bromine, preferably fluorine, a is 1 or 2, b is 0 or 1, a plus b are 2, preferably both a and b being 1, c is 0 or 1, d is 0 to 2, e is 0 to 2, c plus d plus e are 3, preferably each of c, d, and e is 1, and a plus c are 1 or 2, preferably 2, with the proviso that when e is 1 or 2, X is fluorine or bromine, preferably fluorine. The compounds having less than 8 fluorine atoms per molecule are useful as anesthetics, and all of the compounds are useful as solvents and dispersants for fluorinated materials. A highly preferred compound useful as an anesthetic is 1,2,2,2-tetrafluoroethyl 1',1',2'-trifluoro-2'-chloroethyl ether.

Abstract: This invention relates to a novel carbon dioxide product comprising a pumpable slurry consisting of finely divided particles of solid phase carbon dioxide dispersed in liquid phase carbon dioxide in which the solid particles are free flowing, i.e. do not agglomerate on standing for periods of time sufficient to permit beneficial commercial use of the product. The slurry is produced by withdrawing gaseous carbon dioxide at a controlled rate from a vessel containing liquid carbon dioxide at the temperature and pressure conditions of the triple point while vigorously agitating the liquid, to produce solid carbon dioxide particles in the liquid. The rate of formation of the solid is controlled to produce small, finely divided particles of solid carbon dioxide rather than large pieces.

Abstract: Method and apparatus for withdrawing and analyzing gases dissolved in liquid, more specifically, equilibrated blood gas samples in vivo. A catheter including a semipermeable membrane, connected to include a volume of carrier gas at atmospheric pressure, is introduced percutaneousluy into the bloodstream. After a predetermined period, equilibratin occurs between the blood gases and the carrier gas. By means of displacement in the volume or reduction in the pressure, the carrier gas including the equilibrated gas is then removed from the semipermeable membrane to another area for analysis. A corresponding volume of carrier gas is replaced in the semipermeable membrane from an inlet supply.

Abstract: The supply of a gas to be dissolved in a liquid is controlled by initially sensing the concentration of dissolved gas in the liquid under treatment and subsequently producing appropriate control signals for adjusting the setting of a valve in the gas supply line. A dissolution device emplaceable in the liquid under treatment includes a liquid inlet and outlet and a static liquid-gas mixing means therebetween. The device is adapted to receive supplied gas whereby a gas space in the upper reaches of the device is established. The gas space is also maintained in communication with a dip tube disposed exteriorly of the device in the body of liquid with the lower extremity of the dip tube establishing the maximum height of the gas space within the dissolution device.

Abstract: A locking pitch composition for depositing within the pitch reservoir of graphite nipples of the type including such voids. The composition is a heat-foamable, thermoplastic material including particulate pitch in a lignin sulfonate-based binder. The composition may be deposited into the reservoirs of the nipples by direct extrusion at ambient temperatures. When a nipple thus prepared is utilized in an electrode joint assembly, the high temperatures provided at the electrode joint foam the composition to expand it into adjacent thread spaces at the joint. Continued heating then carbonizes the composition to lock the joint.

Abstract: A powder metallurgy process for producing stainless steel stock. The process utilizes readily available, inexpensive, oxygen- and carbon-bearing raw materials and yields stainless steel stock of high purity with a low level of interstitials. After determining the degree of homogeneity desired, the process consists of providing an alloy composition from a particle mass comprising iron, chromium- and/or nickel-bearing powders containing oxygen and carbon, purifying the particle mass in an uncompacted condition in order to obtain a coherent porous compact with a desired purity level and then hot working the compact to produce a homogeneous and densified product. The properties of the product produced by this process are comparable to properties of a wrought product of similar chemical composition.