Patents by Inventor David W. Park
David W. Park has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 8617692Abstract: A sheet of cellulose based material having enhanced strength, particularly the dry strength, substantially unaffected repulpability is disclosed. The sheet of cellulose based materials generally includes a first cellulose based material connected with a second cellulose base material element. The first cellulose based material is formed by separating a portion of the fiber from a furnish, treating the separated portion with a cationic wet strength resin which is allowed to bond to the fiber. The treated fiber is then mixed with the untreated balance of the fiber at some point before the paper machine. The fiber that is separated may be secondary fiber, virgin fiber or combinations thereof. The second cellulose base material element is substantially free from any treatment. The second cellulose base material element may be include substantially all untreated fibers.Type: GrantFiled: December 11, 2009Date of Patent: December 31, 2013Assignee: International Paper CompanyInventors: Terry M. Grant, David W. Park
-
Patent number: 8383784Abstract: A thermoplastic material made from lignin, polyol and a melting point reducer where the melting point reducer is miscible in the specific polyol employed and where the lignin, polyol and melting point reducer are all miscible when in their melted state.Type: GrantFiled: August 31, 2009Date of Patent: February 26, 2013Assignee: Weyerhaeuser NR CompanyInventors: David W. Park, Amar N. Neogi, Ludwig Furtner, Jr.
-
Patent number: 8142526Abstract: Artificial fire logs made from non-petrochemical based, renewable materials are described. These artificial fire logs perform substantially equivalent to existing commercial fire logs. The artificial fire logs are made from cellulosic materials, a lignin containing composition and a non-petroleum based wax where the lignin containing composition comprises lignin and 1,3-propanediol derived from a renewable resource.Type: GrantFiled: August 31, 2009Date of Patent: March 27, 2012Assignee: Weyerhaeuser NR CompanyInventors: David W. Park, Amar N. Neogi, Ludwig Furtner, Jr.
-
Patent number: 7976678Abstract: A high-yield paper sheet generally includes at least about 50 weight percent mechanical pulp, wherein the basis weight of the sheet is in the range of about 24 to about 60 pounds, and wherein the porosity of the sheet is in the range of about 40 to about 100 Sheffield porosity.Type: GrantFiled: December 30, 2008Date of Patent: July 12, 2011Assignee: North Pacific Paper Corporation (NORPAC)Inventors: Michael J Dougherty, Amar N Neogi, David W Park, Brian S Delgardno
-
Publication number: 20110047865Abstract: Artificial fire logs made from non-petrochemical based, renewable materials are described. These artificial fire logs perform substantially equivalent to existing commercial fire logs. The artificial fire logs are made from cellulosic materials, a lignin containing composition and a non-petroleum based wax where the lignin containing composition comprises lignin and 1,3-propanediol derived from a renewable resource.Type: ApplicationFiled: August 31, 2009Publication date: March 3, 2011Applicant: Weyerhaeuser NR CompanyInventors: DAVID W. PARK, Amar N. Neogi, Ludwig Furtner, JR.
-
Publication number: 20110054154Abstract: A thermoplastic material made from lignin, polyol and a melting point reducer where the melting point reducer is miscible in the specific polyol employed and where the lignin, polyol and melting point reducer are all miscible when in their melted state.Type: ApplicationFiled: August 31, 2009Publication date: March 3, 2011Applicant: Weyerhaeuser NR CompanyInventors: DAVID W. PARK, Amar N. Neogi, Ludwig Furtner, JR.
-
Patent number: 7836924Abstract: The present disclosure includes methods for enhancing hardness and dimensional stability of a wood element. In one embodiment, the method includes placing the wood element in a compression assembly set to a compression temperature between about 365° F. and about 410° F., heating and compressing the wood element without exceeding the species' threshold pressure value to produce a compressed wood product, heating the compressed wood product to a post-compression temperature between about 275° F. and about 350° F., and holding the compressed wood product at the post-compression temperature for about 30 to about 48 hours. The disclosure also includes a wood product having enhanced hardness.Type: GrantFiled: January 16, 2009Date of Patent: November 23, 2010Assignee: Weyerhaeuser NR Comp½anyInventors: David W. Park, Ronald C Wilderman
-
Publication number: 20100180987Abstract: The present disclosure includes methods for enhancing hardness and dimensional stability of a wood element. In one embodiment, the method includes placing the wood element in a compression assembly set to a compression temperature between about 365° F. and about 410° F., heating and compressing the wood element without exceeding the species' threshold pressure value to produce a compressed wood product, heating the compressed wood product to a post-compression temperature between about 275° F. and about 350° F., and holding the compressed wood product at the post-compression temperature for about 30 to about 48 hours. The disclosure also includes a wood product having enhanced hardness.Type: ApplicationFiled: January 16, 2009Publication date: July 22, 2010Applicant: WEYERHAEUSER NR COMPANYInventors: David W. Park, Ronald C. Wilderman
-
Publication number: 20100163198Abstract: A method of making a high-yield paper sheet generally includes blending a pulp mixture including at least about 50 weight percent mechanical pulp, making an uncoated paper sheet from the pulp mixture, applying a surface layer to the paper sheet, the surface layer including nPCC, and drying the sheet, wherein the basis weight of the dried sheet is in the range of about 24 to about 60 pounds.Type: ApplicationFiled: December 30, 2008Publication date: July 1, 2010Applicant: NORTH PACIFIC PAPER CORPORATION (NORPAC)Inventors: Michael J. Dougherty, Amar N. Neogi, David W. Park, Brian S. Delgardno
-
Publication number: 20100167198Abstract: A method of printing using liquid toner generally includes obtaining a cellulose based substrate having a surface layer including nPCC, and printing on the cellulose based substrate using a liquid toner printer to achieve tape pull results of less than about 7%.Type: ApplicationFiled: December 31, 2008Publication date: July 1, 2010Applicant: NORTH PACIFIC PAPER CORPORATION (NORPAC)Inventors: David W. Park, Amar Neogi, Michael J. Dougherty
-
Publication number: 20100163195Abstract: A high-yield paper sheet generally includes at least about 50 weight percent mechanical pulp, wherein the basis weight of the sheet is in the range of about 24 to about 60 pounds, and a surface layer on the sheet including nPCC pigment.Type: ApplicationFiled: December 30, 2008Publication date: July 1, 2010Applicant: North Pacific Paper Corporation (NORPAC)Inventors: Michael J. Dougherty, Amar N. Neogi, David W. Park, Brian S. Delgardno
-
Publication number: 20100163196Abstract: A high-yield paper sheet generally includes at least about 50 weight percent mechanical pulp, wherein the basis weight of the sheet is in the range of about 24 to about 60 pounds, and wherein the porosity of the sheet is in the range of about 40 to about 100 Sheffield porosity.Type: ApplicationFiled: December 30, 2008Publication date: July 1, 2010Applicant: NORTH PACIFIC PAPER CORPORATION (NORPAC)Inventors: Michael J. Dougherty, Amar N. Neogi, David W. Park, Brian S. Delgardno
-
Publication number: 20100151164Abstract: A sheet of cellulose based material having enhanced strength, particularly the dry strength, substantially unaffected repulpability is disclosed. The sheet of cellulose based materials generally includes a first cellulose based material connected with a second cellulose base material element. The first cellulose based material is formed by separating a portion of the fiber from a furnish, treating the separated portion with a cationic wet strength resin which is allowed to bond to the fiber. The treated fiber is them mixed with the untreated balance of the fiber at some point before the paper machine. The fiber that is separated may be secondary fiber, virgin fiber or combinations thereof. The second cellulose base material element is substantially free from any treatment. The second cellulose base material element may be include substantially all untreated fibers.Type: ApplicationFiled: December 11, 2009Publication date: June 17, 2010Applicant: International Paper CompanyInventors: Terry M. Grant, David W. Park
-
Patent number: 7648772Abstract: A sheet of cellulose based material having enhanced strength, particularly the dry strength, substantially unaffected repulpability is disclosed. The sheet of cellulose based materials generally includes a first cellulose based material connected with a second cellulose base material element. The first cellulose based material is formed by separating a portion of the fiber from a furnish, treating the separated portion with a cationic wet strength resin which is allowed to bond to the fiber. The treated fiber is them mixed with the untreated balance of the fiber at some point before the paper machine. The fiber that is separated may be secondary fiber, virgin fiber or combinations thereof. The second cellulose base material element is substantially free from any treatment. The second cellulose base material element may be include substantially all untreated fibers.Type: GrantFiled: June 28, 2005Date of Patent: January 19, 2010Assignee: International Paper Co.Inventors: Terry M. Grant, David W. Park
-
Publication number: 20080000603Abstract: Methods are provided for creating covalent bonding of webs by combining cellulosic fibers having a carboxyl content approximately greater than 7 meq/100 g with one or more crosslinking agents. In a first step, a carboxyl group is placed onto a fiber. In an embodiment, the fiber is then reacted with an oxazoline-functional polymer which has been combined with a polycarboxylate compound. Heat is applied to the treated web, and this enables formation of a cross-linked bridge in the form of a covalent bond. In an embodiment, the covalent bonding of the carboxylated cellulose pulp webs utilizes oxazoline-functional polymers and polyacrylic acid. The oxazoline polymer in combination with polyacrylic acid should form a network polymer with covalent bonds to the cellulose carboxyl groups. The non-woven web may be strengthhened by covalent bonding, thereby improving overall wet/dry strength of the final product.Type: ApplicationFiled: June 29, 2006Publication date: January 3, 2008Inventors: Amar N. Neogi, Richard A. Jewell, David W. Park, John A. Westland
-
Patent number: 6996342Abstract: A control system for an agile optical network uses constraint-based rules to minimize route validation computations required when the network is reconfigured. A hierarchical control structure facilitates admission control and insulates admission control from interaction with the physical layer of the network.Type: GrantFiled: October 12, 2001Date of Patent: February 7, 2006Assignee: Nortel Networks LimitedInventors: David W. Park, Lisa M. Gaen, Gerard L. Swinkels
-
Patent number: 6922532Abstract: A performance monitoring method for an optically amplified transmission system. The method provides the optical power at each amplifier site, taking into account the inaccuracies introduced by the SRS in the power estimation obtained with the current methods. An optical spectrum analyzer is used at the output of the transmission link of interest to accurately measure the output power of each wavelength. This value is sent upstream to the last amplifier in the link, to compute an error term as the difference between the actual measurement and the estimation. The error term is used to infer the SRS-induced error by system elements not accounted for in the model. The error term is then fed-back to each amplifier in the link, so that the estimated power is adjusted to account for the SRS-induced inaccuracy.Type: GrantFiled: December 7, 2000Date of Patent: July 26, 2005Inventors: Frederic Simard, David W. Park
-
Patent number: 6569279Abstract: A method for bonding composite wood products comprises using a PMDI adhesive modified with a polar compound such as a lower alkylene carbonate or triacetin with a combination of conductive thermal heat and radio frequency energy. Propylene carbonate is a preferred modifier. Press temperatures and pressing times may be significantly reduced from those using either unmodified PMDI adhesives or the modified adhesives without radio frequency energy. Laminated veneer products 38 mm in thickness can be pressed at 110°-120° C. in as little as 7 minutes using radio frequency energy at a level of about 32 kw/m2.Type: GrantFiled: May 1, 2000Date of Patent: May 27, 2003Assignee: Weyerhaeuser CompanyInventors: David W. Park, Richard E. Wagner, Ronald C. Wilderman
-
Publication number: 20030058497Abstract: An all-optical switching site for extending a range and agility of an all-optical WDM/DWDM network, by controlling signal intensity balance at each link and performing adaptive dispersion compensation for each dropped channel. The all-optical switching site includes a variable optical attenuator (VOA) for each output channel and an adaptive dispersion compensation module (ADCM) in each drop path. The VOAs of output channels transported by an output optical fiber link are controlled with downstream feedback to adjust channel signal intensity balance. The ADCM comprises an adaptive controller and a dispersion compensation element adapted to apply a different amount of dispersion compensation to a channel it receives. The adaptive controller receives feedback from a receiver or a signal analyzer, in order to optimize the dispersion compensation. The all-optical switching site reduces network operational cost, improves network reach and significantly enhances network agility.Type: ApplicationFiled: September 27, 2001Publication date: March 27, 2003Applicant: Nortel Networks LimitedInventors: David W. Park, Marc M. Veilleux, Martin Agnew, Nigel Baker, Loren S. Berg
-
Publication number: 20030011844Abstract: A control system for an agile optical network uses constraint-based rules to minimize route validation computations required when the network is reconfigured. A hierarchical control structure facilitates admission control and insulates admission control from interaction with the physical layer of the network.Type: ApplicationFiled: October 12, 2001Publication date: January 16, 2003Applicant: NORTEL NETWORKS LIMITEDInventors: David W. Park, Lisa M. Gaen, Gerard L. Swinkels