Abstract: A three-dimensional printer uses inkjet-type printheads to rapidly prototype, or print, a three-dimensional model. A powder feeder includes a conveyor system and a metering system to deliver powder to a build area in measured quantities. The powder feeder also includes a vacuum system for loading powder into a feed reservoir or chamber. The vacuum system can also be used to cleanup excess powder. Other powder control features include powder gutters and magnetic powder plows. During printing, a cleaning system operates to remove powder from the printheads. In the event of a printhead or jet failure, the failure can be detected and corrective measures taken automatically. After printing, the model can be depowdered and infiltrated in an enclosure.

Abstract: Fire hydrants which feature additional structure for reducing the potential that those with ill intent can foul municipal water supplies by introducing toxins or other materials into fire hydrants. Various embodiments include valves which close off portions of the hydrant otherwise available for receipt of toxic or other materials when the fire hydrant nozzle cap is unscrewed and open. Such valves preferably open, manually or automatically, when water is flowing from the water supply through the nozzle, a condition which renders it difficult at best to introduce toxins through the hydrant into a water supply, but close off portions of the barrel when the nozzle is open and water is not flowing through the nozzle.

Abstract: A three-dimensional printer uses inkjet-type printheads to rapidly prototype, or print, a three-dimensional model. A powder feeder includes a conveyor system and a metering system to deliver powder to a build area in measured quantities. The powder feeder also includes a vacuum system for loading powder into a feed reservoir or chamber. The vacuum system can also be used to cleanup excess powder. Other powder control features include powder gutters and magnetic powder plows. During printing, a cleaning system operates to remove powder from the printheads. In the event of a printhead or jet failure, the failure can be detected and corrective measures taken automatically. After printing, the model can be depowdered and infiltrated in an enclosure.

Abstract: An elevator car door opening and closing apparatus is taught having a clutch assembly carried by each car door for coupling with a landing door locking and unlocking assembly whereby the car and landing doors open and close simultaneously. The clutch assembly includes a four bar mechanical expanding and collapsing parallelogram linkage which engages, unlocks, and opens the landing door. Mechanical linkage is also attached to the parallelogram linkage whereby the elevator car doors may only be forced opened a limited amount if the car is stalled between landing sites.

Abstract: An elevator car door opening and closing apparatus is taught having a clutch assembly carried by each car door for coupling with a landing door locking and unlocking assembly whereby the car and landing doors open and close simultaneously. The clutch assembly includes a mechanical expanding and collapsing parallelogram mechanism which engages, unlocks, and opens the landing door. Mechanical means is also disclosed whereby the elevator car doors may only be forced opened a limited amount if the car is stalled between landing sites.

Abstract: Analgesic 1,2,3,4-tetrahydroisoquinolines of the formula (1) ##STR1## wherein R.sub.1 and R.sub.2 respectively are hydrogen, hydroxy or alkoxy of 1 to 4 carbon atoms, R.sub.3 and R.sub.4 respectively are hydrogen or alkyl of 1 to 4 carbon atoms, and R.sub.5 is hydroxy, nitro or ##STR2## wherein R.sub.6 and R.sub.7 respectively are hydrogen, alkyl of 1 to 4 carbon atoms or RCO-- wherein R is hydrogen or alkyl of 1 to 4 carbon atoms; pharmaceutically acceptable addition salts thereof with non-toxic acids; analgesic compositions thereof in an inert, pharmaceutical carrier; and methods of preparation from corresponding R.sub.1, R.sub.2, R.sub.3 and R.sub.4 -substituted tetrahydroisoquinolines.

Abstract: Novel 7-ether and 7-thioether derivatives of 2-aryl, 3-aryl, and 2,3-diaryl-2,5,6,7-tetrahydro-3H-pyrrolo[1,2-a]-imidazole and 8-ether and 8-thioether derivatives of 2-aryl, 3-aryl, and 2,3-diaryl-2,3,5,6,7,8-hexahydro-imidazo[1,2-a]-pyridine, such as 2,3,5,6,7,8-hexahydro-2-phenyl-8,8-dimethoxy-imidazo[1,2-a]pyridine hydrochloride, useful as immunomodulators. Diether derivatives are prepared by reacting the corresponding monothioether derivative with a positive halogenating agent in the presence of an alcohol.

Abstract: The 2-aryl-1-aminoalkylcyclohexane nitrile, carboxylic acid or amide and derivatives thereof and methods of preparing same.

Abstract: The instantly claimed invention is a process for preparing a 3-aryl or a 2,3-diaryl-2,5,6,7-tetrahydro-3H-pyrrole[1,2-a]imidazole or a 3-aryl or a 2,3-diaryl-2,3,5,6,7,8-hexa-hydroimidazo[1,2-a]pyridine which comprises (a) contacting the acid addition salt of the corresponding cyclic methylthioimine with a 2-aryl or a 2,3-diarylaziridine and (b) recovering from the resultant reaction mixture the desired compound, useful as immunomodulators.

Abstract: The instantly claimed invention is a process for preparing novel 7-thioether derivatives of 2-aryl, 3 aryl, and 2,3-diary-2,5,7,7-tetra-hydro-3H-pyrrolo [1,2-a] imidazole and 8-thio-ether derivatives of 2-aryl, 3-aryl, and 2,3-diaryl-2,3,5,7,7,8-hexahydro-imidazo [1,2-a]-pyridine which comprises (a) contacting the corresponding amidine with about one molar equivalent of R.sub.1 SSR.sub.1 in the presence of about two molar equivalents of base and at a temperature of -78.degree. C. to about 0.degree. C. (b) contacting the corresponding amidine compound with about two molar equivalents of R,SSR, in the presence of about two molar equivalents of a base and at a temperature of from about -78.degree. C. to about 23.degree. C., said compounds being useful as immunomodulators.

Abstract: Novel 7-ether and 7-thioether derivatives of 2-aryl, 3-aryl, and 2,3-diaryl-2,5,6,7-tetrahydro-3H-pyrrolo[1,2-a]-imidazole and 8-ether and 8-thioether derivatives of 2-aryl, 3-aryl, and 2,3-diaryl-2,3,5,6,7,8-hexahydro-imidazo[1,2-a]-pyridine, such as 2,3,5,6,7,8-hexahydro-2-phenyl-8,8-dimethoxy-imidazo[1,2-a]pyridine hydrochloride, useful as immunomodulators.

Abstract: Certain 1,2,4,5-tetrahydro-7-alkoxy-(and 7,8-dialkoxy)-3H,3-benzazepines are prepared in excellent yields by a three step process comprising reacting a 3-alkoxy-(or 3,4-dialkoxy)-phenethylamine with a halo-acetaldehyde dialkylacetal to form the corresponding N-(2,2-dialkoxyethyl) phenethylamine, reacting that product with BF.sub.3 to close the ring and to form a 1-alkoxy-1,2,3,4-tetrahydro-7-alkoxy-(or 7,8-dialkoxy)-3H,3-benzazepine and reacting that product under reductive cleavage conditions to remove the 1-alkoxy group and to obtain the desired benzazepine. The benzazepines can be further reacted in the known manner or in the manner disclosed herein to form certain 3-substituted benzazepines.

Abstract: A spring hanger assembly for supporting a portion of a pipe line includes a hollow housing having mounted therein a movable upper piston plate and a stationary lower plate, with a coiled compression spring disposed between said plates and urging said upper piston plate in a vertical upward direction. Adjustable hanger means are carried by said upper piston plate and are adapted to be secured to the pipe being supported. The lower plate is affixed to the assembled hanger assembly by means of a plurality of fingers engaging bayonet slots in the lower end portion of the housing. The lower plate has a plurality of partial annular grooves into which a tool may be inserted to compress the spring and allow the fingers to be turned within the bayonet slot in the well-known fashion. Upon removal of the tools the fingers engage the blind slot of the bayonet slot in the well-known fashion.