Abstract: An accurate monitoring of the conditions of a perishable product is achieved by integrating two indicator types - a primary indicator which develops a color change as a result of cumulative time-temperature exposure and a threshold second indicator - into a single device. The combination of the two indicators in the same indicator device provides a human readible signal that gradually and irreversibly develops color as a function of time and temperature and more closely monitors the actual condition of a deteriorative product than does a single indicator. Important features of this integrated monitoring device are reliability and printability. The primary indicator in the system is assisted in color development by the secondary indictor that is set to trigger at a predetermined temperature. When this temperature is reached or exceeded both indicator mechanisms function in an additive mode to cause a break in the typical Arrhenius curve, which a primary indicator alone produces.

Abstract: An improved swimming pool construction of the kind capable of being erected, at least substantially, above ground on a substantially flat surface is provided. The swimming pool is of a construction whose modular components are prefabricated and delivered to the building site for assembly. A bracing member comprised of four cut pieces of standard construction lumber, and provided in pre-assembled modular form, provides load bearing qualities that afford sufficient strength without the need to supply any additional support means that are anchored in the ground. The swimming pool is fabricated from a plurality of wall panels that are secured end-to-end and form the periphery of the swimming pool and contain integrally formed flanges that retain the brace in position. The prefabricated pool delivered to the building site as a package, employs an arrangement of modular elements to provide a self standing swimming pool that can be assembled, using only hand tools to lock together the respective modular parts.

Abstract: A universal swimming pool water filter apparatus for a bottom opening tank comprising multiply useful dual reverse flow port means and cooperating filter medium support having various filtered water passing openings arranged to accommodate fixed cloth or free particulate filtering media, the port means flow being varied with the type of filtering medium support so that a minimum of different production parts are needed to meet all filtering needs, with a consequent reduction in manufacturing equipment and parts inventory.

Abstract: A prepackaged single use disposable wiper pad or towelette that is saturated with a disinfecting liquid is prepared. The wiper pad is effective to disinfect inanimate surfaces such as telephone mouthpiece or toilet seat against a broad spectrum of infectious microorganisms including the HIV-1 or AIDS virus. The wiper pad is of a size which fits in a pocket or purse and makes it convenient to be carried safely by a person and poses no problem in disposing such as by flushing in a toilet.

Abstract: A longitudinal receptor construction for insertion into a channel or opening and for holding a desired element is provided. The receptor has an inverted L-shape cross section in which a horizontal leg is advantageously suited for retrofit usage in an existing groove or channel opening and has locking features which afford substantially improved capability for holding the receptor and the element inserted into the receptor.The groove into which the receptor is positioned may be the groove contiguous to a swimming pool coping and may be the same groove devised for and used to hold another element such as the peripheral bead of a swimming pool liner. Sufficient gripping force by the horizontal receptor leg in the locking groove or channel is provided by the receptor leg configuration which prevents dislodging of the receptor leg by forces pulling on the receptor or other member which may be present in the opening.

Abstract: A small boat or dinghy rigging mechanism is provided advantageously designed to permit the expeditious recovery, hoisting and stowing of a small boat or dinghy in an upright position at the stern of a main vessel. The apparatus of the invention is devised to be readily detached from the main vessel and stowed so that any unsightly presence of the equipment when it is not being used is obviated. The rigger equipment may be detachably affixed for use directly on the transom of a vessel or adapted to be detachably secured at the trailing edge of a platform such as swim platform that is behind the transom. Because the mechanism is devised to dip into the water allowing the small boat or dinghy to be floated into position on the arms of the rigging apparatus, it substantially facilitates the recovery of such craft and obviates any heavy lifting or exertion of the kind frequently encountered by a user in operations of this kind.

Abstract: A photoactivated time-temperature indicator is based on a leuco base system. A thermally insensitive, white ("inactive") leuco base (or a mixture of such leuco bases) is mixed, preferably in a polymeric matrix, with a material that generates acid upon exposure to light. Photoexcitation, preferably by UV or near UV light, causes the formation of a thermally sensitive, color-forming ("active") product. Following this activation step, a progressive color development occurs at a rate that increases with temperature. The indicator is useful for monitoring the freshness of perishable products, particularly those stored at subambient temperature.

Abstract: A new process is described which is useful for producing novel articles of manufacture useful for monitoring the time-temperature history of perishable items. The process initially involves forming a solution comprised of a diacetylenic monomer and a solvent. The solution is frozen, and the frozen solution having crystalline diacetylenic monomer therein is irradiated to partially polymerize the diacetylenic monomer. Partial polymerization of the crystalline diacetylenic monomer admixed with frozen solvent results in the production of a novel article of manufacture having color. The novel article of manufacture is comprised of frozen solvent, diacetylenic monomer, and colored polydiacetylene. Due to the intensity of the color of the polydiacetylene, the entire article of manufacture appears to be colored.The colored article of manufacture may be attached to various perishables to monitor the shelf life of the perishables.

Abstract: A system to impart controlled rigidity to the flexure of a molded plastic structural module is provided. In the system a means for effectively bonding two plastic members and which maintains the integrity of the bond under severely ambient conditions resulting from differences in coefficients of expansion, moisture, flexing and the like, is disclosed. Delamination of the bond, particularly under the flexing condition is minimized by an intermittent bonding surface such as by bonding at the peaks or top points solely of a serrated surface. The system is particularly useful in the provision of a rigidizing member for treads of a plastic stair module for swimming pools. In use as a support for prefabricated plastic swimming pool stair modules, the preformed stair module is equipped with a suitable structural shaped metal rigidizing element that has been encapsulated in a plastic composition.

Abstract: An improved process for the manufacture of sodium metabisulfite is provided. In this process, the chemical reaction forming sodium bisulfite solution is carried out separately from the crystallization of sodium metabisulfite. The crystallization step is carried out without chemical alteration and without pH adjustment.

Abstract: An improved anchor socket and jig assembly for holding implements in concrete is provided which facilitates assembly of the socket element on the base member of the jig assembly and which affords substantially expanded adaptability of the jig for varied size implements and avoids the need for bolts or other extraneous means to secure the socket member to the rail member.The improved jig assembly comprises a longitudinal base member preferably of substantially rigid plastic composition which is provided with locator openings which fit one of the feet of the socket member and, cooperating therewith, a mating turn slot. Both the openings and the turn slots are formed to accommodate the feet of the socket member. The assembly of the socket in the base member in a secure position is readily effected by positioning the socket member between the rails of the base member and locking the two by a manual quarter turn rotation of the socket member in the base member.

Abstract: An arrangement to close an unwanted opening in wall is provided wherein the area of the opening when it has been plugged presents a surface which is flush with the face of the wall.The opening closure system provided permits the use of otherwise surplus unusable modular wall panels to be converted to plain panels that are readily integrated into a swimming pool wall structure. The closure plugs are formed so as to have a dual wall thickness; a central portion having an area co-extensive with the area of the opening to be plugged and a peripheral "frame" portion of a lesser thickness which abuts against the back of the panel portion which frames the opening in the panel. Teeth or mounting screw hole filling protuberance may be integrally formed on the peripheral portion of the closure plug to fill screw or fastener holes present in the wall contiguous to the opening which is to be closed.

Abstract: An activatable time-temperature indicator consists of an oxygen-sensitive reaction product of a triarylmethane dye and a decolorant that is coated on a substrate and covered by an oxygen barrier. Optinally, an oxygen-permeable layer is between the coating and the oxygen barrier. The indicator is activated by removing the oxygen barrier. Following this activation step, a progressive color development occurs at a rate that increases with temperature. The indicator is useful for monitoring the freshness of perishable products, particularly those stored at sub-ambient temperature.

Abstract: A system is provided for feeding a process or bath with a high purity liquid and when needed upgrading or maintaining the purity of such liquid when delivered from a bulk shipping container. In the system, the liquid in which a high degree of purity is desired is pumped through a filter and sensor which detects the level of particulates while maintaining the integrity of the product against contamination. The purity of the liquid is upgraded by pumping, i.e., recirculating, the liquid through a filtration media while sensing the purity, and returning the processing liquid when the desired level of purity is reached. A gas vent filter is used to purify air or vapor passing into or out of the system avoids pressure or vacuum buildup.

Abstract: An arrangement comprising a plurality of wall panels connected end-to-end to form the swimming pool is strengthened and is afforded with means to retain alignment, and prevents the wall panels from buckling. Horizontal stiffening members are positioned in cut-outs formed in vertical support posts secured to the panels and in the vertical flanges at the ends of the panel modules to which brace members are also attached. The stiffening members are contained within the cut-outs and abut against the back of the wall panel at the top. Vertical Z-shaped post or rib members secured to the modular panels are provided with a bottom tab which may be staked in position facilitates alignment of the panels. A longitudinal stiffening member positioned at the bottom of the wall panels is optionally used and adds substantial additional strength and alignment means to the pool structure.

Abstract: Piperazine containing positive photoresist stripping compositions are provided. Formulations include N-aminoalkylpiperazines with the formula ##STR1## bis-N-aminoalkylpiperazines of the formula ##STR2## N-hydroxyalkylpiperazine of the formula ##STR3## and bis-hydroxyalkypiperazines with structure ##STR4## In the above formulae n=1-6. Also included are piperazine derivatives such as those of the above formulae with a branch chain alkyl of 1-6 C atoms, and 5-6 atom cycloalkyl substituted compounds wherein the cycloalkyl is substituted for --(CH.sub.2).sub.n --. Components which may be mixed with the above described piperazine in preparing the positive photoresist stripping compositions of the invention include alkyl or cycloalkyl-2-pyrrolidones of the formula ##STR5## Other amide type solvents with the boiling point in excess of 200.degree. C. as well as high boiling diethylene glycol ethers may also be incorporated.

Abstract: A family of acetylenic complexes especially useful as environmental indicators is provided. The complexes include at least one complexing acid and one acetylenic compound of the formula:[R--(C.tbd.C).sub.a --(CH.sub.2).sub.b --(C.tbd.C).sub.c ].sub.2.dHXwherein, a is 1 or 2; b is about 0-5; c is 0 or 1; d is above 0 to about 2, with the proviso that when a is 1, b and c are 0, and when a is 2, b is about 0-5 and c is 0 or 1; and R is --(CH.sub.2)n--NHC(O)NHR'; wherein n is an integer of about 1 to 10; and R' is selected from a group consisting of hydrogen, cycloalkyl, alkenyl, cycloalkenyl, aklyl, phenyl, alkoxyl, alkoxylcarbonylalkyl, and X is a complexing acid.

Abstract: Acetylenic complexes are disclosed that are useful as environmental indicating materials whereby exposure thereof to environmental stimuli induces a color change. These complexes contain at least one effective complexing metal and at least one acetylenic compound of the general formula:[R--(C"C).sub.a --(CH.sub.2).sub.b --(C"C).sub.c ].sub.2.dHXWherein a is 1 or 2, b is about 0-5; c is 0 or 1; with the proviso that when a is 1, b and c are 0, when a is 2, b is about 0-5 and c is 0 or 1; and R is --(CH.sub.2).sub.n -NHC(O)NHR'; wherein n is an integer of about 1 to 10; and R' is selected from the group consisting of: (a) hydrogen; (b) cycloalkyl; (c) alkenyl; (d) cycloalkenyl; (e) alkyl; (f) phenyl; (g) alkoxy; (h) alkoxy alkyl; and (i) alkoxycarbonylalkyl.

Abstract: A process for the wet calcination of sodium bicarbonate, sodium sesquicarbonate or mixtures thereof comprising forming a suspension of sodium bicarbonate, sodium sesquicarbonate or said mixture in a water-immiscible relative high boiling liquid, and heating the suspension to form sodium carbonate.

Abstract: Sodium carbonate having a high bulk density and pseudo-cubic crystal structure is prepared from impure trona purge liquors from the crystallizers containing high concentration of organics, silica and sulfate by a sequence of steps involving (1) treatment of the liquors with MgO; (2) separation of the treated liquor from the insoluble reaction products; (3) addition of Ca and Mg compounds to the liquor; (4) evaporating the solution to obtain sodium carbonate monohydrate crystals; (5) separating the crystals from the mother liquor; and (6) heating the crystals at temperature of about 150.degree.-200.degree. C. to convert to dense ash.