Abstract: An aquarium filter which is positioned within the aquarium tank on top of and in direct contact with a means of support so that the filter is upwardly disposed from the bottom of the aquarium tank to form a fluid chamber between said means and the bottom of the aquarium tank. A section of permeable synthetic filter material interposes a lower filter member and an upper filter member and the whole thereof is encased in a section of synthetic screen material. A conventional pump assembly is provided as a means for recirculating water through the aquarium filter whereby waste material and debris are collected within said filter and eliminated by natural decay. The movement of water through the aquarium filter also causes air bubbles to collect within said filter thus providing a source for continual passive aeration of the aquarium water.

Abstract: Bisphthalide lactones of formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each independently of one another hydrogen, alkyl of at most 12 carbon atoms which is unsubstituted or substituted by halogen, hydroxy, cyano, tetrahydrofuryl or lower alkoxy; or are acyl of 1 to 12 carbon atoms, cycloalkyl of 5 to 10 carbon atoms or unsubstituted aralkyl or aryl, or aralkyl or aryl each substituted by halogen, cyano, nitro, trifluormethyl, lower alkyl, lower alkoxy, lower alkoxycarbonyl, --NX'X"-- or 4--NX'X--"phenylamino, wherein X' and X" are each independently of the other hydrogen, lower alkyl, cyclohexyl, benzyl or phenyl, or the pairs of substituents --NR.sub.1 R.sub.2 and --NR.sub.3 R.sub.4 are each a 5- or 6-membered, preferably saturated, heterocyclic radical, V.sub.1 and V.sub.2 are hydrogen, halogen, lower alkyl, C.sub.1 -C.sub.12 alkoxy, C.sub.1 -C.sub.

Abstract: A device particularly suited for sharpening broadhead arrows and having sharpening surfaces which are curved in the direction the broadhead travels as it is sharpened. In a preferred embodiment, the sharpener comprises two sharpening surfaces to sharpen broadhead arrows and a third cylindrical sharpening surface which can be used to sharpen other discrete cutting elements. Each broadhead sharpening surface is formed as two sections which are curved about an axis perpendicular to the direction of travel of the arrow blades so that only one line of contact is formed between a blade and its respective sharpening section, resulting in even sharpening along all the points on a blade.

Abstract: An ice crushing apparatus for use in combination with an ice making machine which has an ice storage bin. The ice crusher includes a plurality of rotatable blades which are mounted on a motor-driven shaft and which pass, preferably in sequence, through slots in a grate, for crushing the ice in an ice crushing zone. A mechanism is provided for bypassing the ice crusher and dropping ice directly from the ice maker to the ice storage bin. A mechanism is also provided for moving the grate to change the size of crushed ice particles. In one embodiment, a device is provided for breaking apart large sheets or other chunks of ice before they reach the ice crushing zone. An electronic control system provides ice crusher operation only when ice is harvested in the ice making machine.

Abstract: Apparatus for sharpening a razor blade including a sharpening member, a housing for securing the sharpening member therein and for guiding a razor blade in back-and-forth sharpening movement within the housing. The housing has a transverse slot for inserting a head of a razor blade holder therein, and a longitudinal slot in a top plate thereof for linear movement therein of the handle which carries the blade holder. The sharpening or honing member is preferably made of a plate of glass secured to the bottom wall of the housing.

Abstract: A receiver circuit for data in NRZ1 coding transmitted at high data rates along optical fiber links, wherein in order to overcome problems of phase jitter in the incoming signal, a clock circuit is included comprising a phase locked loop with voltage controlled oscillator for generating a clock signal locked in phase to the incoming data signal, a phase detector for comparing the clock signal with the incoming data signal, a phase frequency detector for comparing the clock signal with a reference clock signal, a multiplexer for switching the phase locked loop to respond either to the output of the phase detector or the phase freqency detector, and a digital counting system for comparing the number of clock pulses generated in a reference period determined by the reference clock, the digital counting system controlling the multiplexer to switch to the output of the phase detector when it is determined that the clock signal is accurately following the reference clock signal.

Abstract: A circuit for recovering clock information from an incoming data signal preferably in NRZ1 form, the circuit including a VCO (18) providing a clock signal (CK) to four integrate/hold circuits (I1to I4) which receive an incoming data signal, the integrate/hold circuits providing an error signal to the VCO (18) for adjusting the phase thereof to that of the incoming data signal, the integrate/hold circuits being sequenced by logic (10) to provide within each period of the clock signal three functions: (1) an integration of the incoming data signal in every bit period in which a voltage transition occurs, (2) a holding of the integrated value within a subsequent bit period or periods, and (3) a resetting of the integrated value following the next voltage transition in the incoming data signal, whereby the held integrated value, whose magnitude is dependent of the phase of the clock signal relative to the phase of the incoming data signal, provides said error signal.

Abstract: Chromogenic lactone compounds of benzopyrano-2H-pyrazoles of the formula ##STR1## in which Ar is an aryl radical which is unsubstituted or substituted by halogen, nitro, cyano, lower alkyl, lower alkoxy, lower alkylthio, lower alkoxycarbonyl, trifluoromethyl, phenoxy, phenylthio or --NX.sub.3 X.sub.4,R.sub.1 is hydrogen, lower alkyl or lower alkoxy,R.sub.2 is lower alkyl, phenyl, or phenyl which is substituted by halogen, lower alkyl or lower alkoxy, andX.sub.1, X.sub.2, X.sub.3 and X.sub.4, independently of one another, are each hydrogen, alkyl which is unsubstituted or substituted by halogen, hydroxyl, cyano, tetrahydrofuryl or lower alkoxy, or are acyl, cycloalkyl, or aralkyl or aryl, each of which is unsubstituted or substituted by halogen, cyano, nitro, trifluoromethyl, lower alkyl, lower alkoxy or lower alkoxycarbonyl, or the substituent pairs (X.sub.1 and X.sub.2) and (X.sub.3 and X.sub.

Abstract: An ice maker employing a relatively thin ice tray with sealed ice cube receptacles and having a freezing chamber of relatively small volume cooled by a high capacity cooling plate. The ice cube receptacles are sealed by a frangible cover to keep liqid water therein and to maintain frozen water in a sanitary state until the frangible cover is ruptured for the ice cubes to be used. The ice maker housing also may include other chambers for holding containers of food and drink. The cooling surface of the freezing chamber may be sloped for drainage and the ice maker provided with a spring loaded device for ejecting the ice tray when a housing door is opened. Detection switches and indicator lights may be actuated by insertion and removal of the tray. Multiple freezing chambers may be jointly cooled by a single cooling plate.

Abstract: A truck cargo rack for holding cargo in the bed of a truck is connected to the bed of the truck and to the sidewalls of the truck. The rack includes adjustable frame members for securing loads of various sizes and a cargo restraining strap to securely hold the cargo to the frame members.

Abstract: A ice maker employing a relatively thin ice tray with sealed ice cube receptacles and having a freezing chamber of relatively small volume cooled by a high capacity cooling plate. The ice cube receptacles are sealed by a frangible cover to keep liquid water therein and to maintain frozen water in a sanitary state until the frangible cover is ruptured for the ice cubes to be used. The ice make housing also may include other chambers for holding containers of food and drink. The cooling surface of the freezing chamber may be sloped for drainage and the ice maker provided with a spring loaded device for ejecting the ice tray when a housing door is opened. Detection switches and indicator lights may be actuated by insertion and removal of the tray. Multiple freezing chambers may be jointly cooled by a single cooling plate.

Abstract: A flexible arm rest for an automobile window sill which is attached by magnets to the outside of the automobile, hangs over the sill, and is urged downward within the automobile by weights. The magnets exert a force on the arm rest which exceeds the force by the weights, with the consequence that raising the window causes the inside edge to move upward until the arm rest is captured between the window and the window jam, in which configuration the arm rest functions as a sunscreen or sunshade.

Abstract: Chromogenic quinazolines of formula ##STR1## wherein R is an aryl radical or a heterocyclic radical,Z.sub.1 is oxygen or sulfur,Z.sub.2 is oxygen, sulfur or ##STR2## R' is hydrogen, alkyl which is unsubstituted or substituted by halogen, cyano or lower alkoxy, or is cycloalkyl, phenyl, benzyl, phenethyl or acyl, or --NRR' is a 5- or 6-membered heterocyclic radical,Q is an aliphatic radical which may be interrupted by a further member Z.sub.2,Y is the radical of a couplable compound, and the ringA is unsubstituted or substituted by halogen, cyano, nitro, lower alkyl, lower alkoxy or lower alkoxycarbonyl.These quinazolines are exceedingly fast to sublimation and are particularly suitable color formers in pressure-sensitive or heat-sensitive recording materials and give strong and lightfast yellow and orange colorations.

Abstract: The invention relates to chromogenic 3,3-bisindolyl-4-azaphthalides of the general formula ##STR1## wherein Y.sub.1 is hydrogen, C.sub.1 -C.sub.12 alkyl which is unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy, or is C.sub.1 -C.sub.12 acyl, benzyl or benzyl substituted halogen, nitro, lower alkyl or lower alkoxy,Y.sub.2 is C.sub.5 -C.sub.12 alkyl, preferably C.sub.6 -C.sub.9 alkyl, which is unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy, andZ.sub.1 and Z.sub.2, each independently of the other, are hydrogen, lower alkyl or phenyl, and the rings A and B, each independently of the other, are unsubstituted or substituted by halogen, nitro, cyano, lower alkyl, lower alkoxy, lower alkoxycarbonyl, amino, mono-lower alkylamino or di-lower alkylamino.These compounds are particularly suitable for use as color formers in pressure-sensitive or heat-sensitive recording materials and produce fast, strong red or violet colorations.

Abstract: Chromogenic bisquinazolines of the formula ##STR1## wherein Q is the direct bond or an aliphatic or cycloaliphatic hydrocarbon radical, or is --CO--, --S-- or --SO.sub.2 --, andY is the radical of a couplable compound, in particular an N-substituted 4-aminophenyl radical or a hydrogenated quinoline radical, and the rings A, B and D are unsubstituted or substituted by cyano, nitro, halogen, lower alkyl, phenyl, benzyl, lower alkoxy or lower alkoxycarbonyl.These compounds are particularly suitable color formers for pressure-sensitive or heat-sensitive recording materials and produce intense yellow or orange colors of excellent fastness to light and, in particular, sublimation.

Abstract: Chromogenic azaphthalides of the formula ##STR1## wherein R.sub.1 and R.sub.2 independently of each other are hydrogen, C.sub.1 -C.sub.12 alkyl which is unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy, or are cycloalkyl, benzyl or phenyl, or benzyl or phenyl which are substituted by halogen, nitro, cyano, lower alkyl, lower alkoxy or lower alkoxycarbonyl; or R.sub.1 and R.sub.2 together with the nitrogen atom to which they are attached are a 5-membered or 6-membered heterocyclic radical and in particular pyrrolidinyl;X is hydrogen, halogen, lower alkyl, lower alkoxy, benzyl, phenyl, benzyloxy, phenoxy, or benzyl or benzyloxy which are substituted by halogen, nitro, lower alkyl or lower alkoxy;Y is hydrogen, unsubstituted or substituted alkyl or benzyl or acyl and in particular C.sub.6 -C.sub.

Abstract: A self-erecting end-loading top-dispensing container which is convertible from a substantially flattened configuration for shipping the empty container into an erected box-like configuration for loading product into the container and for shipping loaded containers. By removing a tear-away portion of the top panel, the container is convertible into a tray having an open top for dispensing product. Connecting webs join the end closures of the container to the front and rear side walls, preserving the structural integrity of the container when the removable top is torn away.

Abstract: The invention relates to ring-substituted 4-azaphthalides of formula ##STR1## wherein Q is a substituted phenyl radical of the formula ##STR2## or a 3-indolyl radical of the formula ##STR3## Y.sub.1 and Y.sub.2 are hydrogen, unsubstituted or substituted alkyl, acyl, or unsubstituted or substituted benzyl,Z.sub.1 and Z.sub.2 are hydrogen, lower alkyl or phenyl,R.sub.1 and R.sub.2, together with the nitrogen atom to which they are attached, are a 5- or 6-membered, preferably saturated, heterocyclic ring,X is hydrogen, halogen, alkyl, alkoxy, acyloxy, benzyl, phenyl, benzyloxy, phenoxy, substituted benzyl or benzyloxy, or is the --NT.sub.1 T.sub.2 group, in which T.sub.1 and T.sub.2 are hydrogen, lower alkyl, cycloalkyl, unsubstituted or substituted benzyl or is acyl, and T.sub.

Abstract: Chromogenic dihydrofuropyridinones of the general formula ##STR1## wherein R.sub.1 and R.sub.2 independently of each other are hydrogen, C.sub.1 -C.sub.12 alkyl which is unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy, or are cycloalkyl, benzyl or phenyl, or benzyl or phenyl which are substituted by halogen, nitro, lower alkyl or lower alkoxy; or R.sub.1 and R.sub.2 together with the nitrogen atom to which they are attached are pyrrolidinyl;X is hydrogen, halogen, lower alkyl, lower alkoxy, benzyl, phenyl, benzyloxy, phenoxy, or benzyl or benzyloxy which are substituted by halogen, nitro, lower alkyl or lower alkoxy;Y is C.sub.6 -C.sub.9 alkyl;Z is hydrogen, lower alkyl or phenyl; andthe ring A is a pyridine radical andthe benzene nucleus B is unsubstituted or substituted by halogen, nitro, lower alkyl, lower alkoxy, amino or lower alkylamino.