Other

Westinghouse Electric Corporation

Reliable Security Systems, Inc.

James W Walsh

Emanuel L Logan

Anthony T Nasuta, Jr

Dropper tip or similar article

The present invention provides a dropper tip suitable for dispensing small-volume droplets of fluid with a minimum drop-to-drop volumetric variation. The dropper tip includes a minimum-surface dispensing tip and a similar minimum-surface interior configuration that minimizes the surface area available at the entry port of the dispenser tip for the aggregation or adhesion of bubbles. In the preferred embodiment, the minimum-surface configuration allows for uniform drop formation at the tip whether or not the dropper is in a vertically inverted or inclined position when dispensing. The interior configuration likewise minimizes the surface area available for air bubbles to congregate or adhere and thereby minimizes the probability of an air bubble reentering the dropper tip when dispensing the second or subsequent drop. A cap effects sealing on a surface other than the tip so that repeated capping and uncapping will not degrade the minimum-surface rim.

Precision micro-liter drop dispenser

A membrane processing method for subjecting solid support membranes used in the analysis and investigation of membrane bound specimens, such as molecules and molecule fragments of DNA and RNA, includes a flexible wall jacket, a membrane support for supporting the membrane within the jacket, and a frame upon which the jacket is mounted for processing. The jacket includes an open end through which the membrane support is inserted and fluid ports for introducing and removing fluid from the interior of the jacket. The membrane support is defined by sheets of open weave fabric that support the membrane to define a multitude of fluid pathways across the opposite surfaces of the membrane and also define lateral distribution channels on opposite edges of the membrane support. The frame includes attachment points for attachment to the jacket and a resilient clamp allows convenient sealing of the open end of the jacket prior to the introduction and removal of treatment fluids. The treatment fluids may be introduced into the jacket by connecting one fluid port to a vacuum source to create a below ambient pressure in the jacket and by introducing a treatment fluid through the other port. The fluid flows through the numerous fluid pathways on the opposite surfaces of the membrane to effect time and cost efficient treatment of the membrane.

Membrane processing method

A membrane processing system for subjecting solid support membranes used in the analysis and investigation of membrane bound specimens, such as molecules and molecule fragments of DNA and RNA, includes a flexible wall jacket, a membrane support for supporting the membrane within the jacket, and a frame upon which the jacket is mounted for processing. The jacket includes an open end through which the membrane support is inserted and fluid ports for introducing and removing fluid from the interior of the jacket. The membrane support is defined by sheets of open weave fabric that support the membrane to define a multitude of fluid pathways across the opposite surfaces of the membrane and also define lateral distribution channels on opposite edges of the membrane support. The frame includes attachment points for attachment to the jacket and a resilient clamp allows convenient sealing of the open end of the jacket prior to the introduction and removal of treatment fluids. The treatment fluids may be introduced into the jacket by connecting one fluid port to a vacuum source to create a below ambient pressure in the jacket and by introducing a treatment fluid through the other port. The fluid flows through the numerous fluid pathways on the opposite surfaces of the membrane to effect time and cost efficient treatment of the membrane.

Flexible jacket membrane processing apparatus

A membrane batch-processor system and method for the fluid treatment of a plurality of specimen containing membranes, such as membranes having specimens of DNA, RNA, and protein molecules deposited thereon, includes a receptacle having an interior cavity and a plug-like closure slidably received in the cavity. A membrane stack is assembled from a plurality of membranes to be treated and flow definers interleaved between the membranes to defined a membrane stack of alternate flow definers and membranes. The flow definers are preferable fabricated from an open-weave fabric-like material to define multiple fluid pathways across the opposite surfaces of each membrane. Fluid distribution plenums are defined between to the receptacle and closure so that treatment fluid introduced into an entry plenum will flow through the multiple fluid pathways across the opposite surfaces of each membrane to expose each membrane to the treatment fluid and effect time and fluid efficient treatment of the membranes.

Membrane batch-processing apparatus

Apparatus for identifying and directing attention to a location, such as an emergency exit, includes a series of sound generators arranged along a path leading from a remote site to the location. The sound generators are energized sequentially and individually, preferably with a tone which rises in frequency as the sound travels from the remote site to the location of interest. If the sound generators are used to direct attention to an emergency exit, the sound generators are activated upon the occurrence of an emergency condition, such as a fire, and the sequence of tones is cycled continuously until the emergency condition ceases.

Apparatus for directing attention to specific locations such as

Opening of a door, such as an emergency exit door, is delayed by encumbering a security device, such as for example a latch bolt, with the task of throttling a hydraulic fluid through a circuit, which circuit includes a normally open valve held closed by a solenoid. When the solenoid is de-energized, the circuit is opened allowing the security device to move so that the door can be opened. The solenoid is controlled by an electrical timing circuit which delays de-energization of the solenoid. The timing circuit is started by a switch mounted to be operated by movement of the latch bolt. Preferably in a situation where there are a plurality of doors, doors proximate to one another are delayed by the same electronic timing circuit. In a preferred embodiment, the electronic timing circuit is set to de-energize the solenoid at a time subsequent to the delay resulting from throttling the fluid.

Emergency exit door latch with hydraulic and electronic delay

A plurality of shielded wires are held bundled and electrically interconnected at their braided-shield exteriors by a compacted metallic thin-wall honeycomb member whose collapsed cell walls encircle the wires individually. The honeycomb wrap around the wire bundle is encircled by a heat-shrunk sleeve of plastic tubing, and the collapsed cell walls are held electrically joined to the braided shields by conductive adhesive.

Growing community of inventors

Baltimore, MD, United States of America

James W Walsh