Abstract: An improved method and structure for sealing the ends of a tubular filter element is described. The method comprises providing a strip of non-porous film along the edge of a sheet of microporous filter material, the strip being joined to the filter material fluid-tight at its outer portion but forming a free flap on its inner portion, forming the element with the strip at one end and over the upstream side of the filter material, embedding the end in liquid sealer to a depth terminating over the flap portion of the strip, and solidifying the sealer. A similar procedure is described for seaming the axially-extending side edges of a cyclindrical element.

Abstract: A test device for assaying liquid samples for the presence of a predetermined reagent is described. The device comprises telescoping top and bottom members defining a liquid reservoir therebetween, resilient means for biasing the members in the open position, one or more test wells in the top member with bottom openings covered with microporous membranes, a co-reactant immobilized on the membrane surfaces, and sorbent means between the members spaced from the membrane(s) in the open position but in contact therewith in the closed position. Liquids are passed through the membrane(s) into the sorbent means by depressing the members to the closed position.

Abstract: An improved photocopy receiver tray is disclosed to minimize misstacking and jams. The tray comprises means for mounting to a photocopy machine, a bottom, and rear means for arresting copies, the bottom being divided into a front portion and a lower rear portion separated from the front portion by a step, the rear portion, step and arresting means defining a pocket for stacking at least one size copies. Preferably the tray bottom declines toward the arresting means, and guide means are provided at the machine copy exit for directing copy over and out of contact with a substantial part of the front portion of the tray bottom.

Abstract: Improved pressure marking fibrous record material such as paper is provided wherein the rear surface is in contact with a profusion of liquid droplets of marking material such as ink. The fibers of the paper are vapor treated to render them repellent to the liquid marking material without substantially reducing the porosity of the sheet. Upon application of patterned marking pressure to the paper, the ink droplets are forced through the sheet to form a visible image of the pattern on the top surface. The repellent treatment reduces lateral flow of the ink in the sheet and improves image definition.

Abstract: Jet printing is described employing an ink of low viscosity and resistivity having improved resistance to abrasion and solvents after drying. The ink comprises an acrylic polymer, dyestuff, volatile basic compounds, and a complexed multivalent metal ion cross-linking agent dissolved in a solvent vehicle which is predominantly water, a lower alcohol, or mixtures thereof.

Abstract: A concentrating solar energy system is disclosed which permits efficient collection without tracking. The system comprises a collector having an elongate, trough-shaped body with an inner reflective surface having a cross-sectional curve of height H, throat opening T, and conforming substantially to the cartesian curve Y = .+-. AX.sup.b, the curve concentrating incident radiation into an included receiving area of maximum dimension R, wherein B is about 0.30 plus or minus 0.15, A is from about 0.5 to 2.5, H/T is between about 0.5 to 2.0 and preferably about 1, and the concentration ratio T/R is at least 3. For photothermal recovery, an absorptive liquid is used circulating in a transparent receiver tube, the liquid being automatically drained to avoid high temperatures when not circulating.

Abstract: A cooperating pair of trawler doors is disclosed wherein each door comprises a longitudinally arcuate body with a convex inner side and a concave outer side, at least one louver in the body providing slots for passage of water through the doors, first attaching means affixed to the forward portion of the convex inner side for attachment of the forward portion of a tow line to the towing vessel, and second attaching means affixed to the aft portion of the concave outer side of the door for attachment of the aft portion of the towline to a trawler net.

Abstract: A method for making a novel assembly of laid-on labels, without die-cutting, is described. The method comprises printing over the release surface of a temporary carrier web a liquid pressure-sensitive adhesive in a predetermined pattern of discrete label areas separated by intervening areas of the carrier, solidifying the adhesive surface, forming a continuous film of radiation polymerizable liquid over each adhesive area, the film over each area being unconnected to films over adjacent areas, and exposing the films to radiation sufficient to solidify them by polymerization. Preferably the films extend over the edges of the adhesive and comprise liquids which do not wet the release surface.

Abstract: A receiving surface is decorated with a metal film in a pattern by applying an area of thin frangible metal to a temporary carrier having a release surface, printing an adhesive in the pattern desired for the metal on either the metal film or receiving surface, the area of the pattern being less than the area of the metal film, pressing and adhering the receiving surface and metal film together with the adhesive therebetween, and stripping away the carrier. The metal over the adhesive remains on the receiving surface to provide the decorative metal pattern and the balance is carried away with the carrier. The receiving surface can be a final surface to be decorated or can be the exposed surface of an ink design heat transfer. In the latter case, a combined heat transfer having both a decorative metal film pattern and a multicolor ink design can be provided by coating the receiving surface, after transfer of the metal film pattern thereto, with a second adhesive over both the metal pattern and ink design.

Abstract: A method is disclosed for providing protective overcoatings to the surface of labels which are spaced apart and removably adhered to the release surface of a carrier web, the method comprising applying to the surface of the labels and to the surface of the carrier web exposed between labels a radiation-curable liquid composition, the composition wetting the surface of the labels to form a continuous film thereover, but not wetting the exposed release surface of the carrier web and forming thereover beads of liquid substantially unconnected to the continuous film over the labels, and thereafter exposing the films to a source of radiation sufficient to cure them to solvent resistant and abrasion resistant layers.