Abstract: A knife for cutting fibrous insulation batts in a single motion with one hand consists of a blade having a smooth, curved edge adapted to both compress and cut the insulation batt along the entire length of the curved edge without tearing the insulation batt and a handle permanently and non-movably attached to one end of the blade.

Abstract: A knife for cutting fibrous insulation batts in a single motion with one hand consists of a blade having a smooth, curved edge adapted to both compress and cut the insulation batt along the entire length of the curved edge without tearing the insulation batt and a handle permanently and non-movably attached to one end of the blade.

Abstract: A knife for cutting fibrous insulation batts in a single motion with one hand consists of a blade having a smooth, curved edge adapted to both compress and cut the insulation batt along the entire length of the curved edge without tearing the insulation batt and a handle permanently and non-movably attached to one end of the blade.

Abstract: A personal office or work chair is provided which includes an open frame construction wherein a seat portion of the chair includes a pair of front springs mounted on either side of the frame, each spring located between frame members extending rearwardly toward the chair seat back portion of the chair, and forwardly to the front edge of the seat portion. In a preferred arrangement, each spring comprises a strip of non-woven fiberglass epoxy resin including forward and rearward substantially planar mounting portions.At the same time, the seat back portion of the chair includes an open frame wherein a pair of laterally spaced frame members are hingedly secured to the corresponding laterally spaced frame members of the seat portion by a hinge bar or rod extending across the frame.

Abstract: A dental bleaching instrument with a source for generating heat. A temperature sensor can be distanced from the heat generator for determining the heat proximal to the teeth. That more accurately reflects the temperature of the heat actually reaching the tooth surface. The light used for bleaching the teeth provides, originally, IR, optically visible light and UV wavelengths. All UV and optically visible light is filtered except for a narrow band of optically visible light to facilitate aiming. Also, the heat source of the device is physically separable from the power and control mechanism yet electrically connected thereto, to facilitate alignment and location of the light with respect to the patient.

Abstract: The invention relates to novel fluoran compounds of the general formula ##STR1## wherein R.sub.1 and R.sub.2, each independently of the other, are lower alkyl;A is ##STR2## or a pyrrolidinyl, piperidino, morpholino or piperazino radical; and R.sub.3 and R.sub.4, each independently of the other, are C.sub.1 -C.sub.12 alkyl, cycloalkyl, phenyl or phenyl substituted by lower alkyl or lower alkoxy.These compounds are particularly suitable for use as color formers in pressure-sensitive or heat-sensitive recording materials.

Abstract: The invention relates to novel fluoran compounds of the general formula ##STR1## wherein R.sub.1 and R.sub.2, each independently of the other, are lower alkyl;A is ##STR2## or a pyrrolidinyl, piperidino, morpholino or piperazino radical; and R.sub.3 and R.sub.4, each independently of the other, are C.sub.1 -C.sub.12 alkyl, cycloalkyl, phenyl or phenyl substituted by lower alkyl or lower alkoxy.These compounds are particularly suitable for use as color formers in pressure-sensitive or heat-sensitive recording materials.

Abstract: An illuminator for a dental handpiece where the handpiece is of the type which has therein a light conductor that is small enough and light enough so that it can be mounted on and coupled directly to the handpiece. The light source in the illuminator is a quartz-halogen bulb. The illuminator housing provides for maintaining the quartz-halogen bulb at the necessary high temperature and in addition, provides for sufficient cooling and thermal insulation to protect the hand of the operator. The construction is such that a new bulb in its own housing can readily be substituted for the original on failure of the bulb.

Abstract: Chromogenic compounds of normally colorless form are disclosed having the following structural formula: ##STR1## wherein E represents a six-membered aromatic or heterocyclic ring which may have an aromatic condensed ring or a naphthalene ring and both the E ring and the condensed ring may be substituted, A represents an optionally substituted aminophenyl, indolyl, benzoindolyl, julolidinyl or kairolyl radical or the radical represented by B, and B represents a family of indolizine radicals. The compounds of this invention are eligible for use in pressure-sensitive and heat-sensitive record materials and manifold marking systems.

Abstract: A process for separating a collated stack of carbonless copy paper sheets into form sets, which comprises applying to the edge of the stack of sheets to be padded an adhesive composition containing borax, drying and separating the unit sets.

Abstract: Chromogenic compounds of normally colorless form are disclosed having the following structural formula: ##STR1## wherein E represents a six-membered aromatic or heterocyclic ring which may have an aromatic ring or a naphthalene ring and both the E ring and the condensed ring may be substituted, A respresents an optionally substituted aminophenyl, indolyl, benzoindolyl, julolidinyl or kairolyl radical or the radical represented by B, and B represents a family of indolizine radicals. The compounds of this invention are eligible for use in pressure-sensitive and heat-sensitive record materials and manifold marking systems.

Abstract: Chromogenic compounds of normally colorless form are disclosed having the following structural formula: ##STR1## wherein E represents a six-membered aromatic or heterocyclic ring which may have an aromatic condensed ring and both the E ring and the condensed ring may be substituted, A represents an optionally substituted aminophenyl, indolyl, benzoindolyl, julolidinyl or kairolyl radical or the radical represented by B, and B represents a family of heterocyclic radicals. The compounds of this invention are eligible for use in pressure-sensitive and heat sensitive record materials and manifold marking systems.

Abstract: Chromogenic compounds of normally colorless form are disclosed having the following structural formula: ##STR1## wherein E represents a six-membered aromatic or heterocyclic ring which may have an aromatic condensed ring and both the E ring and the condensed ring may be substituted, A represents an optionally substituted aminophenyl, indolyl, benzoindolyl, julolidinyl or kairolyl radical or the radical represented by B, and B represents a family of indolizine radicals. The compounds of this invention are eligible for use in pressure-sensitive and heat sensitive record materials and manifold marking systems.

Abstract: A process for separating a collated stack of carbonless copy paper sheets into form sets, which comprises pretreating the edge of the stack of sheets to be padded with a non-aqueous material, drying, applying an adhesive composition, drying and separating the unit sets.

Abstract: A process for separating a collated stack of carbonless copy paper sheets into form sets, which comprises pretreating the edge of the stack of sheets to be padded with water or an aqueous solution or dispersion, drying, applying an adhesive composition, drying and separating the unit sets.