Patents Assigned to Pennwalt Corporation
  • Patent number: 5107120
    Abstract: A passive infrared detector, including a pyroelectric sensor with three pairs of contiguous, active elements and a Fresnel lens with a plurality of segments each of which has an optical center and an equivalent focal length, each pair of active elements disposed in different plane, with each optical center juxtaposed to the plane of at least one of those active elements, substantially at the focal length.
    Type: Grant
    Filed: September 22, 1989
    Date of Patent: April 21, 1992
    Assignee: Pennwalt Corporation
    Inventor: Edward Tom
  • Patent number: 4963607
    Abstract: Polyolefins are stabilized against the harmful effects of U.V.-light by incorporating therein certain organosulfides. The organosulfides may be used alone or in synergistic combination with two classes of known light stabilizers, namely the benzophenones and the esters of aromatic acids.
    Type: Grant
    Filed: June 13, 1989
    Date of Patent: October 16, 1990
    Assignee: Pennwalt Corporation
    Inventors: James L. Reilly, Joseph M. Bohen
  • Patent number: 4956494
    Abstract: Alkanesulfonic acids and alkanesulfonyl chlorides, free of undesirable side products arising from side-chain chlorination, are prepared by oxidation with hydrogen peroxide of the corresponding alkanethiol, dialkyldisulfide or alkyl alkanethiolsulfonate mixed with aqueous hydrochloric acid.
    Type: Grant
    Filed: June 15, 1989
    Date of Patent: September 11, 1990
    Assignee: Pennwalt Corporation
    Inventors: Altaf Husain, Gregory A. Wheaton
  • Patent number: 4954542
    Abstract: Tetrahalophthalate esters are disclosed herein as flame retardant processing aids for polybutylene terephthalate (PBT) resins.
    Type: Grant
    Filed: March 25, 1988
    Date of Patent: September 4, 1990
    Assignee: Pennwalt Corporation
    Inventors: Joseph M. Bohen, Ronald F. Lovenguth
  • Patent number: 4954811
    Abstract: A penetration sensor is disclosed which contains first and second transducers sandwiched around a layer which capacitively isolates the individual transducers. This sensing arrangement allows for the operational state of the sensor to be tested by applying an interrogation signal to each of the transducers.
    Type: Grant
    Filed: November 29, 1988
    Date of Patent: September 4, 1990
    Assignee: Pennwalt Corporation
    Inventors: Joseph V. Chatigny, Peter R. Smith
  • Patent number: 4950364
    Abstract: 1,1-Dichloro-1-fluroethane and 1,1,1,3,3-pentafluorobutane are separated from their liquid mixtures, such as liquid mixtures resulting from the hydrofluorination of 1,1,1-trichloroethane or vinylidene chloride. 1,1-Dichloro-1-fluoroethane and 1,1,1,3,3-pentafluorobutane are completely separated by distillation, by adding to the mixture thereof a liquid containing at least about 3 moles of hydrogen fluoride per mole of 1,1-dichloro-1-fluoroethane in the mixture subject to separation.
    Type: Grant
    Filed: May 4, 1989
    Date of Patent: August 21, 1990
    Assignee: Pennwalt Corporation
    Inventor: John A. Wismer
  • Patent number: 4944853
    Abstract: A process is disclosed for the preparation of 3-(organothio)aldehydes by reacting a mercaptan with an .alpha., .beta.-unsaturated aliphatic aldehyde under actinic radiation in the absence of an oxygen-containing gas wherein the mercaptan and aldehyde are mixed in substantially equimolar amount and the reaction temperature ranges from about 2.degree. to less than 60.degree. C.
    Type: Grant
    Filed: September 11, 1989
    Date of Patent: July 31, 1990
    Assignee: Pennwalt Corporation
    Inventor: Stanley R. Sandler
  • Patent number: 4938945
    Abstract: Anhydrous ferric fluoride of 99.0% purity or greater, based upon F.sup.- analysis is afforded, as well as a process for its manufacture using anhydrous FeCl.sub.3 and liquid anhydrous HF, reacted in the substantial absence of O.sub.2, H.sub.2 O, or an oxidizing agent.
    Type: Grant
    Filed: October 18, 1988
    Date of Patent: July 3, 1990
    Assignee: Pennwalt Corporation
    Inventors: Tariq Mahmood, Charles B. Lindahl, Ronald E. Davis
  • Patent number: 4938894
    Abstract: Tetrahalophthalate esters are disclosed herein as flame retardant processing aids for ABS (acrylonitrile-butadienestyrene terpolymer) resins.
    Type: Grant
    Filed: October 30, 1987
    Date of Patent: July 3, 1990
    Assignee: Pennwalt Corporation
    Inventors: Joseph M. Bohen, Ronald F. Lovenguth
  • Patent number: 4937385
    Abstract: A process is disclosed for continuously preparing dialkyl disulfides and dialkyl polysulfides by reacting at elevated temperature and in the presence of a solid, particulate catalyst an alkene and hydrogen sulfide in a first reaction zone, and then passing the reactor effluent into a second reaction zone where it is reacted at elevated temperature with molten, elemental sulfur in the presence of a solid, particulate catalyst.
    Type: Grant
    Filed: May 18, 1988
    Date of Patent: June 26, 1990
    Assignee: Pennwalt Corporation
    Inventors: Bernard Buchholz, Edward J. Dzierza, Robert B. Hager
  • Patent number: 4931019
    Abstract: An electrostatic image display apparatus which uses piezoelectric film to enable a user to form images on a screen. The apparatus is contained within a housing. Supported within the housing is a common electrode. A layer of piezoelectric film is separated a distance from the common electrode by a suspension medium. The suspension medium contains electrially charged pigmented particles, the color of which contrasts with the color of the suspension medium. The housing has an opening for applying localized pressure to one surface of the piezoelectric film. In addition, the apparatus has a source for energizing the common electrode to a preselected electric potential. By applying a force or infrared energy to an area of the piezoelectric film a charge accumules on the inner surface of the film, directly under the point of application of the force. This charge attracts the electrically charged pigmented particles in the suspension medium which are visible through the film and create an image display.
    Type: Grant
    Filed: September 1, 1988
    Date of Patent: June 5, 1990
    Assignee: Pennwalt Corporation
    Inventor: Kyung T. Park
  • Patent number: 4927891
    Abstract: Acrylic coating resins with attached light stabilizer functional groups are provided.The polymer bound light stabilizer coating resins are prepared by reacting light stabilizer hydrazides, LS--C(.dbd.0)--NR.sup.3 --NH.sub.2, with an acrylic prepolymer containing at least two different types of reactive functional groups, one of which is a hydroxyalkyl ester group and the other is carboxyl, anhydride, epoxy or isocyanate. LS is a light stabilizer moiety, and R.sup.3 is hydrogen, primary alkyl of 1 to 8 carbons, secondary alkyl of 3 to 8 carbons, aralkyl of 7 to 12 carbons or cycloalkyl of 5 to 12 carbons. The reaction may be carried out in an inert solvent or in the bulk state.The acrylic resins so produced with chemically bound light stabilizer groups are particularly useful in the stabilization of coatings. Enamel or lacquer coatings containing the polymer bound light stabilizer regins exhibit outstanding weatherability and durability.
    Type: Grant
    Filed: November 23, 1988
    Date of Patent: May 22, 1990
    Assignee: Pennwalt Corporation
    Inventors: Vasanth R. Kamath, James D. Sargent
  • Patent number: 4926650
    Abstract: A refrigerant fluid and system containing and utilizing such fluid in which the fluid consists essentially of a mixture of trichloromonofluoromethane and 1-chloro-1,1-difluoroethane.
    Type: Grant
    Filed: May 18, 1988
    Date of Patent: May 22, 1990
    Assignee: Pennwalt Corporation
    Inventors: Douglas D. Dawn, Reinhard Radermacher
  • Patent number: 4927873
    Abstract: Flame retardancy of polyphenylene ether resins is increased by blending with the resin a flame retarding amount of a halophenyl hydrocarbyl ester. The ester is preferably the reaction production of a halogenated phenol, preferably a bromophenol, and a hydrocarbyl acid, acid chloride or acid anhydride. The polyphenylene ether resin may include homopolymers or copolymers of polyphenylene ethers or blends of polyphenylene ethers with vinyl aromatic resins such as styrene polymers and copolymers. The flame retarding halophenyl esters are also effective as processing aids in improving the flowability and moldability of the polyphenylene ether resins during melt processing.
    Type: Grant
    Filed: March 25, 1988
    Date of Patent: May 22, 1990
    Assignee: Pennwalt Corporation
    Inventor: Joseph M. Bohen
  • Patent number: 4925903
    Abstract: Compounds which contain peroxide linkages and the radical of a hindered amine light stabilizer group are provided. These compounds function as polymerization initiators which cause the hindered amine stabilizer to be chemically bound to the polymer.
    Type: Grant
    Filed: September 18, 1989
    Date of Patent: May 15, 1990
    Assignee: Pennwalt Corporation
    Inventor: Terry N. Myers
  • Patent number: 4923917
    Abstract: Tetrahalophthalate esters are disclosed herein as flame retardant processing aids for styrene-maleic anhydride (SMA) resins.
    Type: Grant
    Filed: March 25, 1988
    Date of Patent: May 8, 1990
    Assignee: Pennwalt Corporation
    Inventor: Joseph M. Bohen
  • Patent number: 4923916
    Abstract: Tetrahalophthalate esters are disclosed herein as flame retardant processing aids for polystyrene resins.
    Type: Grant
    Filed: July 19, 1988
    Date of Patent: May 8, 1990
    Assignee: Pennwalt Corporation
    Inventors: Joseph M. Bohen, Ronald F. Lovenguth
  • Patent number: 4923506
    Abstract: A controlled release composition of biologically active materials is prepared by reacting a biologically active agent, aqueous polyhydroxy polymer, inorganic salt, and optional filler(s), drying the product and then grinding the product to the desire particle size. The product is then used, for example, for controlling pests.
    Type: Grant
    Filed: June 28, 1988
    Date of Patent: May 8, 1990
    Assignee: Pennwalt Corporation
    Inventors: Ludwig K. Huber, Harold G. Monsimer
  • Patent number: 4915947
    Abstract: There are disclosed microcapsules containing a phytotoxic compound of the formula: ##STR1## where x is oxygen or sulfur and R is alkyl, alkoxy, alkylamino, halo, nitro or hydrogen, and the microcapsule walls comprise resinous polycondensates which are crosslinked polyurea, crosslinked polyamide or crosslinked polyamide-polyurea wherein the degree of crosslinking is about 25-100%, the walls are about 10 to about 30% of the total weight of the microcapsules, and the microcapsules have an average size ranging from about 7 to about 25 microns in diameter.
    Type: Grant
    Filed: November 7, 1986
    Date of Patent: April 10, 1990
    Assignee: Pennwalt Corporation
    Inventors: Jean Thenard, Shyam B. Advani
  • Patent number: 4912158
    Abstract: Tetrahalophthalate esters are disclosed herein as flame retardant processing aids for polycarbonate resins.
    Type: Grant
    Filed: March 25, 1988
    Date of Patent: March 27, 1990
    Assignee: Pennwalt Corporation
    Inventors: Joseph M. Bohen, Ronald F. Lovenguth