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For the Technophiles... I repeat, these are random abstracts I have gathered, I have no further information (save the full text) or affiliation with these. Patent Number: 4879996 Title: Closed circuit breathing apparatus Inventor(s): Harwood, Jr.; Van N. Williamsville NY Dosch; Jeffrey J. Buffalo NY Netteland; Loyal G. West Seneca NY Abstract: A closed circuit breathing apparatus such as that worn by personnel in irrespirable atmospheres. The apparatus is mounted on a backframe and housing 14 and is adapted to be interconnected with a face mask 12. The apparatus includes exhalation and inhalation passageways 18, 20, a source of breathing gas 50 which is released into the breathing apparatus at a constant volumetric flow rate, a carbon dioxide scrubber 38 and an ejector pump 40 which is driven by the source of pressurized breathing gas and which causes the pressurized breathing gas and exhaled air to be driven through the carbon dioxide scrubber at a relatively constant flow rate. The apparatus further includes a spring biased inhalation gas accumulator or counterlung 46 on the downstream side of the carbon dioxide scrubber, which counterlung is in communication with the inhalation passageway. An exhalation gas accumulator 42 is provided on the upstream side of the carbon dioxide scrubber, the exhalation gas accumulator being in communication with the exhalation passageway. The exhalation and inhalation gas accumulators are in fluid communication with each other so that at extremely high breathing rates exhaled gases can flow from one to the other whereby all system gases will be held at the same pressure. A warning device 78, 80 is provided, as well as a redundant circuit. ------- Patent Number: 4066076 Title: Rebreathable gas mixing and control device Inventor(s): Williamson; Larry H. Fountain Valley CA Abstract: A life support system providing breathable gas from a high pressure source utilizes an exhaled gas treatment device to eliminate harmful components from exhaled gas and incorporates a novel rebreathable gas mixing and supply device in which inhalation pressure of the user activates a fresh breathable gas supply valve which, in turn, jets the fresh breathable gas into and through a mixing chamber, providing a booster type suction force to pull exhaled gas through the treatment device, mixing the treated, purified gas with the fresh gas and supplying the resultant mixture to the user. ---------- Patent Number: 03910780 Title: Separative barrier for preferential transport of CO2 and apparatus employing same Inventor(s): Henley; Julian L. New York NY Chang; Sanlu Y. Lexington MA Abstract: Rebreather type underwater breathing apparatus is provided with a device for extracting CO2 from expiration products and discharging same into the surrounding water. The extraction device functions by virtue of having external walls separating the expiration products from said water which walls are formed from a porous hydrophobic membranous element. Enhanced action is obtained when said membranous element is impregnated with an hydration catalyst for hydration of CO2. ----------- Patent Number: 3710553 Title: CARBON DIOXIDE SCRUBBER AND BREATHING DIAPHRAGM ASSEMBLY FOR DIVING APPARATUS Inventor(s): Parker; Frederick A. Broomall PA Soult; Charles J. Willingboro NJ Assignee(s): Biomarine Industries, Inc. Abstract: A compact carbon dioxide scrubber and breathing diaphragm assembly for a closed circuit breathing system in which exhaled air is channeled by a baffle system over a moisture absorbant material and through a replaceable annular cartridge containing a carbon dioxide removal chemical in such a way that the chemical cartridge is blanketed by the exhaled or expelled air and is insulated from surrounding cold water. Uniform flow through the chemical cartridge is assured by providing high unit area water repellent filters at the top and bottom of the cartridge. Because of the large total area exposed to the flow of expelled air, there is a minimum pressure drop which is virtually unnoticeable to the diver and because of the water repellancy, water or moisture in the exhaled air does not collect upon and form blockages to decrease the effective area exposed to the flow of expelled air. Breathing circuit gases pass into a pressure equalization chamber formed by a diaphragm assembly which accepts that volume of gas in the same fashion as breathing bags which are occasionally used with semi-closed equipment. As the diver descends, water pressure exerts a force on the diaphragm which moves it in a direction to reduce the volume of gas until a valve is tripped permitting the entrance of a diluent or inert gas. During ascents, when water pressure decreases, this same diaphragm surface moves outwardly to expand the volume until a bypass-check valve is opened which permits exhaust of pressure balancing quantities of gas contained in the chamber. This pressure equalization chamber and diaphragm therefore are formed as parts of the same scrubber assembly thus producing a very compact unit which may be closely positioned relative to the lungs of the user and which may be disassembled for replacement of the carbon dioxide scrubber cartridge as well as permitting visual inspection and/or repair of other components of the device. Consult the specification for other features and details. ----------------- Patent Number: 5292272 Title: Dual mode swim fin Inventor(s): Grim; Roger W. Lafayette GA Abstract: A swim fin for use in a swimming mode and in a walking mode has a boot portion including a shoe having a foot receiving pocket and a bulbous connecting member. Three tracks are formed in the connecting member terminating in a cavity at each end of each track, the cavity at one end being disposed substantially parallel to the axis of elongation of the foot receiving pocket and thus the foot of a swimmer and the cavity at the other end of each track being disposed approximately 90 to the axis of the foot receiving pocket. The fin also includes a web having fingers adapted to be received in the cavities at one end of the tracks or in the cavities at the other end of the tracks selectively when the web is positioned in the swimming mode or the walking mode. The web also carries pins which are resiliently connected to the boot portion of the fin and positioned within a guideway in the connecting member. The configuration of the guideway is such as to urge the fingers into one or the other sets of cavities. The fingers may be positioned in one set or the other of the cavities by pulling the web to remove the fingers from one set of the cavities and repositioning the web with the fingers positioned in the other set of cavities. Mark. "Against every great and noble endeavor stand a million mediocre minds." - A. Einstein "Only in men's imagination does every truth find an effective and undeniable existance. Imagination, not invention, is the supreme master of art as life. - "Joseph Conrad"
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