Abstract: A climbing tree stand for enabling a user to climb a tree or other substantially vertical object to be climbed adaptable for use in a plurality of different utilization modes including a tree stand mode, a backpack mode, and a chair mode, the tree stand including a seat platform assembly having a pair of tree engaging members associated therewith movable between a first storage position and a second operative position for selectively engaging the object to be climbed, a footbed assembly having a pair of tree engaging members associated therewith movable between a first storage position and a second operative position for likewise selectively engaging the object to be climbed, and a pair of cable members, each cable member being respectively adjustably attachable to the seat platform assembly and the footbed assembly.

Abstract: A climbing tree stand for enabling a user to climb a tree or other substantially vertical object to be climbed adaptable for use in a plurality of different utilization modes including a tree stand mode, a backpack mode, and a chair mode, the tree stand including a seat platform assembly having a pair of tree engaging members associated therewith movable between a first storage position and a second operative position for selectively engaging the object to be climbed, a footbed assembly having a pair of tree engaging members associated therewith movable between a first storage position and a second operative position for likewise selectively engaging the object to be climbed, and a pair of cable members, each cable member being respectively adjustably attachable to the seat platform assembly and the footbed assembly.

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: 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: 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: 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: Devices that have the capability to simultaneously manipulate the curling screws of a lip rolling machine while it is in operation and lip rolling machines so modified.

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: 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: A modification is presented to improve radar systems, which normally tracks a single target, to enable them to perform a simultaneous search of a large space volume while maintaining track of a selected target. This modification entails an operating process in which a search is conducted with a controlled search pattern and search time so that the antenna is as close as possible to the tracked target position at the search conclusion and antenna slewing time is mimimized. Finally, the present procedure can be implemented while adding as little as a thousand words of memory to the radar system.

Abstract: The present application discloses a short-term microbial assay useful in detecting chemical mutagens. A Bacillus subtilis which is infected with a strain of the temperate bacteriophage .phi.105 having a conditional lethal mutation is specifically illustrated. In the assay exogenous DNA from wild-type .phi.105 is reacted with a potential mutagen and then transfected into the B. subtilis carrying a mutated .phi.105 DNA. After plating, an increase in the frequency of clear plaques signifies that the test compound is mutagenic.The present invention provides a short-term mutagenicity test which detects frameshift as well as base substitution mutations induced by chemicals.

Abstract: A controller is described for limiting the rate and acceleration of a device positioned by at least one actuator which responds to a sequence of position commands separated by time intervals incorporating a subtractor for taking the difference of two consecutive position commands to provide a difference signal in vector form, means for determining the magnitude of the difference signal, a comparator for comparing the magnitude of the difference signal with a predetermined value, a switch for coupling the desired position command to the actuator at times the magnitude of the difference signal is less than or equal to the predetermined value, two dividers, two multipliers, an adder and normalizer for providing a new position command between the past command and the desired position command at times the magnitude of the difference signal exceeds the predetermined value.

Abstract: A medium to low PRF pulse doppler radar wherein the effect of the clutter notch filter is eliminated at times when the doppler frequency of the target approximates the doppler frequency of the clutter to continue tracking the target provided that the doppler frequency of the target and clutter are at different ranges.

Abstract: Enveloped viruses such as rhabdoviruses, herpes viruses, influenza viruses, .alpha. viruses and paramyxo viruses are inactivated by contacting the viruses or virus infected cells with a .beta.-aminophenylketone compound such as 4-n-butoxy-.beta.-(1-piperidyl)propiophenone hydrochloride; 3,4-dichloro-.beta.-(1-piperidyl)propiophenone; 4-n-decyloxy-.beta.-(1-piperidyl)propiophenone; or 4-n-butoxy-.beta.-(N,N-diethylamino)propiophenone.

Abstract: An energy saving food serving system for rethermalization of the food and for delivery prepared meals to locations remote from the place of preparation, such as to patients to hospitals and nursing homes. The system includes a mobile cart having its own rechargeable power pack that is utilized to propel the cart. The cart has separate bays, each having a tier of racks for carrying individual food serving trays. Each tray has one or more thermally isolated heat transfer devices which are selectably energized when the tray is in place on a rack in the cart. Preferably, each tray has a pair of heaters referred to herein as plate and bowl heaters and adapted to be operated by control means in either a continuous mode of operation or a rethermalization mode of operation.