Abstract: A pressure relief valve for packages in which the valve element comprises a liquid impregnated porous element covering outlet openings in the package, with the liquid layer in the porous element being torn open by package contents pressures in excess of a predetermined value to permit gas outflow from the package.

Abstract: A venting closure assembly extending across an access opening on the top part of a tank, particularly a milk tank. There is a venting closure member having perimeter flange members which fit against a support ring of the milk tank to form one or more circumferential venting channels. A cover having a vent opening fits over the closure member and engages the peripheral portions thereof to form a circumferential seal against the support ring. The venting channel or channels connect to circumferentially spaced openings on the flanges to provide venting from inside the tank to the area outside the tank, while preventing both spilling of the milk and contamination from outside sources.

Abstract: A cap assembly for the reservoir of a vehicular brake comprising a cap body and a cap cover, the cap body including a first cylindrical portion adapted to be received in the opening of said reservoir, a flange integrally formed with and radially and outwardly extending from the first cylindrical portion and a second cylindrical portion extending from the side of the flange opposite the side of the flange adjacent from the first cylindrical unit; and the cap cover including a third cylindrical portion adapted to fit on the second cylindrical portion of the cap body and closed at one end; the second and third cylindrical portions having mating radial tongue and groove engaging means and the closed end of the third cylindrical portion covering the second cylindrical portion to thereby close the opening of the reservoir. A method for producing a cap assembly for the reservoir of a brake which comprises a cap body and a mating cap cover connected together by means of tongue and groove engagement.

Abstract: A vent structure intended for use in venting gas from the interior of a battery housing can be constructed so as to use a generally cup-shaped, resilient valve element. The element is positioned within a cavity at the top of the housing with the bottom of the element spaced from an opening in the bottom of the cavity and with the peripheral wall of the element resiliently engaging the interior of the cavity. A retainer extends across the open top of the cavity and engages the bottom of the valve element so as to hold it in place. The retainer holds the valve element so that the peripheral wall of the valve element can flex inwardly to permit the escape of gas. The vent structure is utilized with a gas-liquid separator placing the opening in the bottom of the cavity in communication with the interior of the housing. The cavity and the gas liquid separator are shaped so as to permit liquid to drain back into the interior of the housing from within the interiors of the cavity and the gas-liquid separator.

Abstract: A venting closure assembly extending across an access opening on the top part of a milk tank. There is a venting closure member having perimeter flange members which fit against a support ring of the milk tank to form one or more circumferential venting channels. A cover having a vent opening fits over the closure member and engages the peripheral portions thereof to form a circumferential seal against the support ring. The venting channel or channels connect to circumferentially spaced openings on the flanges to provide venting from inside the tank to the area outside the tank, while preventing both spilling of the milk and contamination from outside sources.

Abstract: A cap for a fuel tank of the type comprising a labyrinth path between the fixed elements and the moving elements of the cap. Said labyrinth path is formed by concentric ribs defining grooves which intercommunicate by way of interruptions forming baffles, and a sealing element disposed on said ribs. Said sealing element has at least one projection which is adapted, in one angular position of the sealing element with respect to the labyrinth path, to close said path and, in another angular position, not to close said path.

Abstract: A stackable container lid for a bucket containing hot foods and the like comprising a generally circular lid having center portion surrounded by a series of polyhedrons, one plane of which extends upwardly at right angles from the lid surface thereby forming a perimeter into which the bottom of the bucket can be inserted. The lid may also contain vent holes in a rim on the outer perimeter of the container lid. The rim terminates in a downwardly extending lip adapted to snap over the top of the bucket in a sealing relationship.

Abstract: This invention relates to a vent valve having an elongated housing. The housing has an inlet port positioned below an outlet port when the housing is in an upright position. A passage connects the inlet and outlet parts. The passage construction provides free passage of gaseous fluid but restricts momentary liquid flow or splash when the housing is in an upright position. A ball valve in the passage restricts liquid flow when the housing is tilted more than 90.degree. from its upright position.

Abstract: To protect electronic components located within a housing structure, or casing, which contains ventilation openings, against corrosion due to intrusion of water, for example being sprayed thereon upon cleaning of the area on which the structure is mounted, the housing is formed with an attachment surface having ventilation ducts formed therein which are generally Y-shaped having two branch ducts terminating at the outside of the housing in spaced position, and forming an angle with respect to each other, for example terminating at essentially right angled housing edges, and a third trunk duct connected to the interior of the housing, and branching off from the two branch ducts, so that water sprayed against the housing may run through the branch ducts, without impingement on a back wall, and ventilation is provided by additional movement of air through the trunk of the Y-shaped duct; the ducts are preferably mounted with respect to the housing in such a manner that any liquid which might accumulate within the

Abstract: A vent for a truck mounted tank comprising a duct, one end of which originates in the normal upper expansion space of the tank interior and terminates on the outside of the tank so that the duct can convey air from the interior of the tank to the outside atmosphere surrounding the tank. The duct is so designed that regardless of what position it is in, it has a generally upward or vertical component between the inlet and outlet portions of the duct, which provide that a portion of the duct is always above the level of the liquid in the tank, which prevents liquid from flowing through the duct from the interior of the tank to the outside atmosphere regardless of what position the tank is in. The duct preferably extends the full length of the tank and completely encircles the tank interior at least once. To prevent liquid from inadvertantly entering the duct, the duct may be provided with a low pressure check valve.

Abstract: A fuel tank filler cap with superimposed compartments that are defined from one another by partition walls and filled with fibrous material, the top wall of the uppermost compartment having an air vent and the partition walls having communication ports therethrough, so located with respect to one another and the air vent that communication from the interior of the fuel tank to the air vent through the fibrous material filling the superimposed compartments is so tortuous that the escape of liquid fuel from the tank is virtually impossible, though vapors can freely leave the tank and air can readily enter it.

Abstract: A vent structure for reliable long term operation at high temperatures is fabricated by annealing a tubing of predetermined length and size, filling the tubing with fine alumina particles, flattening and coiling and pressing an upper portion of the tubing at predetermined pressures, annealing the formed tubing, and installing a particulate filter in the undeformed lower portion of the tubing. For use in venting helium generating reactor control pins located under hot molten sodium, a vent assembly including the vent structure and providing an air lock between the outer molten sodium and the vent is affixed to the upper end of each control pin.

Abstract: A cryostat comprising a thermally insulated vessel intended to store cryogenic products and provided with a neck tightly closed with a stopper. Between the inner surface of the neck and the stopper there a helical channel is formed through which the vapor of the cryogenic product is withdrawn to the atmosphere. The ratio of the length of the helical channel to the cross-sectional area thereof is such that the excessive vapor pressure of the evaporating cryogenic products in the vessel is eliminated while the temperature of the vapor at the outlet of the neck corresponds to the temperature of the ambient atmosphere. In this way a cryostat of 34 liter capacity can be used to store biological materials at the temperature of liquid nitrogen for at least 120 days.The proposed cryostat can be used to store biological materials at the temperature of liquid nitrogen for at least 120 days. The capacity of the cryostat is 34 liters.

Abstract: In an electrical cable having an impervious sheath thereabout defining a space between the cable and the sheath, a breather cap assembly is provided to enable the space between the cable and the sheath to be in free communication with the ambient atmosphere surrounding the sheath, while serving to prevent the ingress of water into the space. The breather cap assembly comprises a nipple which is threadedly secured to the sheath and includes an orifice extending longitudinally therethrough. A slot is provided in the end of the nipple and in communication with the orifice to prevent the orifice from being blocked inside the sheath. The other end of the nipple is threadedly secured to baffle means. The baffle means is a hollow member including an open end disposed furthest away from the nipple means and having a planar baffle staked within the interior of the baffle means and a cup-shaped baffle press fit therein and adjacent the opening.