Patents Represented by Attorney Antoine H. Gauvin
-
Patent number: 5071579Abstract: The corrosion inhibiting systems comprise at least one of the following: sodium fluorophosphate, and a water soluble salt of phosphonic acid derivatives having the general formula R.sub.n R.sub.1 N(CH.sub.2 PO.sub.3 H.sub.2).sub.2-n wherein R.sub.n and R.sub.1 are each independently selected from a member selected from the group consisting of alkyl, aminoalkyl and N-hydroxyalkyl and n is an integer selected from 1 and 0. The methods comprise laying on a surface a system as defined above. The invention also discloses deicers, paints and other corrosion inhibitors in numerous carriers. Products containing at least residual amounts of a system as defined above are also disclosed.Type: GrantFiled: December 12, 1988Date of Patent: December 10, 1991Assignee: Domtar Inc.Inventors: Allan Johnston, Dean Mason, Darren F. Lawless, Terrence E. Peel
-
Patent number: 5021122Abstract: A shaped product comprising exploded bark. Preferably the shaped product comprises exploded softwood bark having at least 23% cellulose and at least 18% lignin and polyphenols content, based upon the dry weight basis of the bark. One of the methods to make the shaped product comprises exploding softwood bark to obtain exploded softwood bark having at least 23% cellulose and at least 18% lignin and polyphenols content, compressing that exploded bark into a shaped product, while removing in part water, and drying the shaped product to remove the remaining water.Type: GrantFiled: January 22, 1990Date of Patent: June 4, 1991Assignee: Domtar Inc.Inventors: Michel J. Desrochers, Michel Jean, Michel P. Drouin
-
Patent number: 5004808Abstract: A product comprising a water soluble, high molecular weight aminoalkyl-derivative of hydroxyalkyl-cellulose. The molecular weight of said cellulose is at least 50,000 daltons. One of the methods to obtain the product comprises reacting a hydroxyalkyl cellulose in a basic aqueous medium, in the presence of halogenalkylaminohalide compounds, to obtain a hydroxyalkyl cellulose having an alkylamino group which can be used as such or further reacted in the presence of an amide reducing agent, for instance sodium cyanoborohydride and a carbohydrate residue selected from the group consisting of mono-, di-, oligo-saccharides and starch.Type: GrantFiled: July 7, 1988Date of Patent: April 2, 1991Assignee: Domtar Inc.Inventors: Manssur Yalpani, Magdy M. Abdel-Malik
-
Patent number: 4963664Abstract: New amines and amides of carboxylated polysaccharides having the nitrogen of the amido and amino groups directly attached to the polysaccharides and method of making same, based on reacting in solution a material having carboxyl-containing polysaccharides, such as carboxymethyl cellulose, with ammonium donors having the general formula >NH such as primary and secondary amine reagents and with or without a reducing agent to obtain amides or amines. These products may be used for instance in biological separations, for the immobilization of proteins, for the removal of metal ions, as thickeners, and as suspension agents.Type: GrantFiled: October 26, 1989Date of Patent: October 16, 1990Assignee: Domtar Inc.Inventors: Manssur Yalpani, Magdy M. Abdel-Malik
-
Patent number: 4960532Abstract: This suppressant comprises at least 45% water. A water thickening agent is dissolved in water, and forms with water the dispersion medium. A coal tar pitch is dissolved in an aromatic solvent and forms the dispersed liquid which results in suspension. The aromatic solvent has generally a residual softening point of about 40.degree.-70.degree. C. (as measured by ASTM-D-36). This dust suppressant has a viscosity of 3500 to 15000 cps at 25.degree. C. A process for making same comprises: 1- adding to water having a pH of about 7 to 9, a thickening agent to form a dispersion medium having a viscosity of at least 2000 centipoises at 25.degree. C. as measured with ASTM-D4420, with a Brookfield, 2- dispensing under high shear conditions into the dispersion medium, a pitch dissolved in an aromatic solvent, at least 70% of which is boiling over 270.degree. C., to obtain a (in concentrate form) suspension having at least 45% water content.Type: GrantFiled: October 26, 1988Date of Patent: October 2, 1990Assignee: Carbochem Inc.Inventor: Henry A. Kremer
-
Patent number: 4959461Abstract: New Amines and amides of carboxylated polysaccharides having the nitrogen of the amido and amino groups directly attached to the polysaccharides and method of making same, based on reacting in solution a material having carboxyl-containing polysaccharides, such as carboxymethyl cellulose, with ammonium donors having the general formula >NH such as primary and secondary amine reagents and with or without a reducing agent to obtain amides or amines. These products may be used for instance in biological separations, for the immobilization of proteins, for the removal of metal ions, a thickeners, and as suspension agents.Type: GrantFiled: November 14, 1989Date of Patent: September 25, 1990Assignee: Domtar Inc.Inventors: Manssur Yalpani, Magdy M. Abdel-Malik
-
Patent number: 4929454Abstract: The present invention relates to a method of preserving wood material and rendering said wood material resistant to biological deterioration, by impregnating a wood material with a composition comprising an aqueous ammoniacal solution of copper and quaternary ammonium compounds. The invention also embraces the product resulting therefrom.Type: GrantFiled: October 18, 1985Date of Patent: May 29, 1990Assignee: Domtar Inc.Inventors: David M. Findlay, deceased, Neil G. Richardson
-
Patent number: 4925923Abstract: A product comprising, a water insoluble lignin material, at neutral or acid pH, having chemically bound a sulfur(S) content from at least 9.5%, and a phosphorus(P) content from 3.3 to 10%. At least 50% by weight of the S and P content is thiophosphate. In said lignin material the mole ratio S/P is at least 1.8 that of S to aromatic unit (S/Ar) is greater than 0.7, and the P/Ar ratio is from 0.3 to 0.8. The lignin material has chelating capacities for gold at pH 2 of at least 2.2 millimoles per gram of lignin material. On IR analysis the lignin material has infra-red absorption bands evidencing P.dbd.S, P--S or Ar--S, P--O--Ar, aromatic, CH.sub.2 --S, and P--O--C groups in the vicinity of 730-750, 640-670, 1080-1110, 1490-1510, 820-845, and 965-995 cm.sup.-1, respectively. In the absence of interferring IR bands, the sum of the intensity of the bands in the vicinity of 640-670 cm.sup.-1 and 730-750 cm.sup.-1 over the intensity of the band in the vicinity of 1080-1110 cm.sup.-1 is greater than 1.Type: GrantFiled: May 10, 1989Date of Patent: May 15, 1990Assignee: Domtar Inc.Inventors: Manssur Yalpani, Leon Magdzinski
-
Patent number: 4910688Abstract: A method and apparatus for determining on-machine, components of variances over an entire frequency range, of a property of a substantially continuous moving sheet material. At least two property-sensing detectors measure and each provide a signal Y(t) proportional to a sheet material property at a different location in the cross machine direction of a moving sheet material. Preferably a spectrum analyzer, determines the power spectral density function G(f) for each detector's signal, and the coherence function COH(f) between the two detectors' signals. On the basis of these results, the total variance, the machine direction variance, the residual variance and the contributions of the machine-directional cyclic and non-cyclic variances of the property of interest are determined, preferably by a computer. These contributions are generally indicative of process and/or machine upsets.Type: GrantFiled: April 1, 1988Date of Patent: March 20, 1990Assignee: Domtar Inc.Inventor: Junis Amini
-
Patent number: 4906579Abstract: A method to selectively oxidize a polyglucose, on the oxygen of the hydroxy groups of the C-6 position of the glucose rings, while substantially maintaining the degree of polymerization of the polyglycosidic units, comprising heating a 6-sulfonyl polyglucose, for instance 6-O-para-(P)-toluene sulfonyl polyglucose with dimethyl sulfoxide (DMSO) in the presence of at least a catalytic amount of a catalyst selected from a member of the group consisting of: symmetrical--collidine, sodium bicarbonate and pyridine, to produce a polyglucose having aldehyde groups on the oxygen of the hydroxyl on the C-6 position of the glucose rings. In a preferred embodiment when pyridine is selected, this method enables use of that reaction to obtain other new products having other functional groups, mainly on the C-6 position of the glucose rings, without having to purify the aldehyde which may serve as intermediate.Type: GrantFiled: April 26, 1988Date of Patent: March 6, 1990Assignee: Domtar IncInventors: Manssur Yalpani, Magdy M. Abdel-Malik
-
Patent number: 4857638Abstract: A product comprising lignin material having a N-content of at least 1.86% and a sulfur content of at least 3.1%, an IR in the vicinity of 1550 to 1670 cm.sup.-1 having a peak width of at least 60 cm.sup.-1. The product is also directed to such products being cross-linked and which are most suitable as chelating agents in basic medium. The product may also be used as flame retardant, for agricultural and other end uses. The invention is also directed at a method of making the above product which comprises heating a lignin containing material with thiourea H.sub.2 N--C(S)--NH.sub.2 : for example by heating in a solvent or melting.Type: GrantFiled: December 28, 1987Date of Patent: August 15, 1989Assignee: Domtar Inc.Inventors: Manssur Yalpani, Leon Magdzinski
-
Patent number: 4832190Abstract: The packing brace is inserted into washing machines to maintain the agitator, tub and housing of the machine free from movement relative to each other when transporting the machine. A preferred corrugated fiberboard blank produces a box having a top panel extending perpendicularly into a pair of opposite end panels, the latter extending perpendicularly toward each other into a pair of bottom panels. The pair of bottom panels extends perpendicularly toward the top panel into a pair of juxtaposed tuck panels which have locking tabs. The locking tab of each tuck panel is inserted and thereby releasably locked within an elongated aperture in the top panel. The pair of bottom panels and their extending tuck panels each have a cut out portion cooperating to define a box-like opening within the packing brace, the box-like opening having a depth less than the depth of the packing brace. A means to indicate orientation of the packing brace and blank therefor is also disclosed.Type: GrantFiled: August 15, 1988Date of Patent: May 23, 1989Assignee: Domtar Inc.Inventor: Ande Favreau
-
Patent number: 4786547Abstract: An exterior insulating sheathing which comprises a foam polystyrene ply and a second ply glued to said polystyrene ply throughout. The second ply is preferably a fiberboard but may also be a waferboard. The sheathing is nailable, has a racking load of about 1900 to 3700 lbs, and has at least he exposed side of the second ply water resistant. This sheathing has a minimum tensile strength of 65.+-.14 kPa, a linear expansion at 97% RH and 23.degree. C., of less than 0.40%.+-.0.02, a water vapor transmission of at least 96.sup.ng.Pa.s.m.sup.2, and a modulus of rupture of 0.5 to 17.2 megaPascal.Type: GrantFiled: April 9, 1987Date of Patent: November 22, 1988Assignee: Domtar Inc.Inventor: Andre St-Michel
-
Patent number: 4782788Abstract: A blank and box therefrom forming a shallow disposable litter box. The box has four wall panels extending into bottom panels fastened to form a bottom. The wall panels extend remote from the bottom panels into four top panels for forming a top sealing the box. Two opposite top panels have an aperture and handle cooperating to releasably lock the four top panels in a closed position and enable the box to be carried horizontally with one hand. One of the top panels, other than the two cooperating top panels, when in an open position preferably provides an opening for an entry and exit way for different-sized pets.Type: GrantFiled: October 30, 1987Date of Patent: November 8, 1988Assignee: Domta Inc.Inventor: Marcel Arcand
-
Patent number: 4770742Abstract: A method for increasing the efficiency of the caustizing process which comprises: (a) adding to a green liquor between 78 and 82% of the stoichiometric amount of lime necessary to react with the amount of Na.sub.2 CO.sub.3 present in the green liquor to obtain a white liquor containing NaOH and lime mud. The white liquor is then clarified by extracting the lime mud present to obtain a white liquor having a total solid concentration of about 10-60 grams/liter. The supernatant liquid of the white liquor is treated with an additional amount of lime to increase the causticity to about 87%, then allowing further causticizing reaction between the lime and Na.sub.2 CO.sub.3. The remaining lime mud present is removed to obtain a white liquor which has the causticity of about 87%. One is thus able to raise the causticity of partially clarified white liquor following the normal causticizing process, the mud present being sufficient to increase causticity without substantially decreasing settling rate.Type: GrantFiled: August 7, 1987Date of Patent: September 13, 1988Assignee: Domtar Inc.Inventor: Alexander K. Bonsu
-
Patent number: 4759840Abstract: A device for simultaneously separating cohesively bonded particles, by the action of a turbulent air stream, and classifying them according to their size, the device has a horizontal hood connected to the upstream and downstream air ducts. Equipped with an air fan, the upstream air duct has a converging section to accelerate a stream of air. Feed hoppers distribute the particles into the upstream end of the hood where they are separated and classified. Collecting devices are below the hood to receive the classified particles. A recirculating air duct is disclosed including a built-in filter device. A method is also disclosed for simultaneously separating cohesively bonded particles and classifying them according to their size.Type: GrantFiled: October 16, 1986Date of Patent: July 26, 1988Assignee: Domtar Inc.Inventors: Wallace J. McIntyre, John H. Gottschalk
-
Patent number: 4757938Abstract: A blank, defining an I beam partition, has a center panel extending at each end edge into a foldably connected substantially L-shaped end panel. The ell extensions of the L-shaped end panels are adjacent one of the side edges of the center panel. At least one of the L-shaped end panels has about the center of its widest portion a cut portion defining an aperture. The L-shaped end panels are bent about their edge foldably connected to the center panel, to extend substantially perpendicularly away from the center panel thus defining an I beam partition to be snugly inserted in boxes. The invention is also directed to a box having the I beam partition wherein each of the L-shaped end panels is snugly positioned adjacent one of the ends of the box to reinforce the ends. The center panel extends between the L-shaped end panels, dividing the box in two portions and cooperating with the L-shaped end panels and the ends to prevent inward and outward movements of the ends of the box.Type: GrantFiled: January 30, 1987Date of Patent: July 19, 1988Assignee: Domtar Inc.Inventor: Arthur B. Collins
-
Patent number: 4642268Abstract: A wood substrate having good flame resistance characteristics while substantially maintaining its adherence characteristics for asphalt products. One surface of the wood substrate has a coating of an inorganic soluble silicate impregnating the wood substrate and forming a firm bonding with it. A process which is disclosed comprises: (a) coating at least one surface of a wood substrate with a concentrated solution of an inorganic soluble silicate, and (b) drying said coating as to leave on said surface the inorganic silicate impregnating the wood substrate and form a firm bonding with the wood substrate.Type: GrantFiled: October 4, 1985Date of Patent: February 10, 1987Assignee: Domtar IncInventor: Andre St.-Michel
-
Patent number: 4541560Abstract: The carton is formed with a transverse partition formed by a first partition panel foldably connected to a glue panel of the box and having a second partition panel foldably connected thereto along the fold line substantially perpendicular to the fold line connection between the first partition panel and the glue panel. The second partition panel had a glue flap at its opposite end which is connected to its adjacent end wall of the carton. A transverse partition is formed in each of the first and second partition panels with the transverse partition panel formed from the first partition being at the end of the first partition remote from the said glue panel and the transverse partition in the second partition panel being formed adjacent the said glue panel. The transverse partitions are connected to their respective partition panels via fold lines substantially parallel to the fold line connection between the first partition panel and the glue panel.Type: GrantFiled: January 13, 1984Date of Patent: September 17, 1985Assignee: Domtar IncInventor: David Fischer
-
Patent number: 4500968Abstract: A paper machine wet line monitor is provided by photographing the surface of the wire of a paper machine in the area of the wet line (sometimes known as the dry line) with a video camera to generate video signals. The video signals are digitized and define a line corresponding to the wet line of the machine and this line is displayed preferably while also indicating the average location of the wet line across the machine. The processed digitized signal may be imposed on an automatic headbox control to influence this control and maintain the position of the wet line.Type: GrantFiled: June 29, 1982Date of Patent: February 19, 1985Assignee: Domtar Inc.Inventor: Wojciech L. Bialkowski