Patents by Inventor Rafael Malespin
Rafael Malespin 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).
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Patent number: 6671478Abstract: An improved zero draft cylindrical noise attenuator for electrostatographic printers made of structural foam and having a cylindrical sidewall thicker than 4 mm throughout at least most of its circumference and a gap along the length of its long dimension. The improved attenuator more effectively dampens vibration and is less costly to make.Type: GrantFiled: August 21, 2002Date of Patent: December 30, 2003Assignee: Xerox CorporationInventors: Alan M. Litman, Rafael Malespin, Keith A. Nau
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Patent number: 6572801Abstract: An improved process for injection molding of components having zero draft sides comprising: making a mold having a zero draft cavity and an end-cap to seal the mold; injecting suitable resin material into the mold; foaming the resin material; separating the end-cap section from the cavity section of the mold; and removing the part from the mold. In particular, the zero draft process is intended for manufacture of an improved zero draft cylindrical noise attenuator for electrostatographic printers, said attenuator having a cylindrical sidewall thicker than 4 mm throughout at least most of its circumference; and a gap along the length of its long dimension.Type: GrantFiled: March 30, 2001Date of Patent: June 3, 2003Assignee: Xerox CorporationInventors: Alan M. Litman, Rafael Malespin, Keith A. Nau
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Publication number: 20030002885Abstract: An improved process for injection molding of components having zero draft sides comprising: making a mold having a zero draft cavity and an end-cap to seal the mold; injecting suitable resin material into the mold; foaming the resin material; separating the end-cap section from the cavity section of the mold; and removing the part from the mold. In particular, the zero draft process is intended for manufacture of an improved zero draft cylindrical noise attenuator for electrostatographic printers, said attenuator having a cylindrical sidewall thicker than 4 mm throughout at least most of its circumference; and a gap along the length of its long dimension.Type: ApplicationFiled: August 21, 2002Publication date: January 2, 2003Applicant: Xerox CorporationInventors: Alan M. Litman, Rafael Malespin, Keith A. Nau
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Publication number: 20020141781Abstract: An improved process for injection molding of components having zero draft sides comprising: making a mold having a zero draft cavity and an end-cap to seal the mold; injecting suitable resin material into the mold; foaming the resin material; separating the end-cap section from the cavity section of the mold; and removing the part from the mold. In particular, the zero draft process is intended for manufacture of an improved zero draft cylindrical noise attenuator for electrostatographic printers, said attenuator having a cylindrical sidewall thicker than 4 mm throughout at least most of its circumference; and a gap along the length of its long dimension.Type: ApplicationFiled: March 30, 2001Publication date: October 3, 2002Applicant: Xerox CorporationInventors: Alan M. Litman, Rafael Malespin, Keith A. Nau
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Patent number: 6381848Abstract: A method for making a developer roll sleeve in which a core substrate roll is spray coated with a conductive composition including a host resin composition and a wear-resistance imparting additive. Preferably, the host resin composition includes a phenolic thermosetting resin and a conductivity additive such as a carbon black, graphite and the like. Further, the wear resistance imparting additive is preferably selected from the group consisting of a polytetrafluoroethylene resin (e.g., Teflon), graphite, ultra-high molecular weight polyethylene having a molecular weight from about 3,000 to about 4,500 grams, molybedenum disulfide, silicone and mixtures thereof. The wear resistance imparting additive is preferably provided in an amount sufficient to obtain a thickness wear rate of less than about 0.00047 percent per printing cycle.Type: GrantFiled: April 27, 2001Date of Patent: May 7, 2002Assignee: Xerox CorporationInventors: Alan M. Litman, Michael F. Zona, Rafael Malespin
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Publication number: 20010023225Abstract: A developer roll sleeve and method for making the same is disclosed. In a preferred embodiment, a core substrate roll is spray coated with a conductive composition comprising a host resin composition and a wear-resistance imparting additive. Preferably, the host resin composition comprises a phenolic thermosetting resin and a conductivity additive such as carbon black, graphite and the like. Further, the wear resistance imparting additive is preferably selected from the group consisting of a polytetrafluoroethylene resin (e.g., Teflon), graphite, ultra-high molecular weight polyethylene having a molecular weight from about 3,000 to about 4,500 grams, molybdenum, molybdenum disulfide, silicone and mixtures thereof. The wear resistance imparting additive is preferably provided in an amount sufficient to obtain a thickness wear rate of less than about 0.00047 percent per printing cycle.Type: ApplicationFiled: April 27, 2001Publication date: September 20, 2001Applicant: Xerox CorporationInventors: Alan M. Litman, Michael F. Zona, Rafael Malespin
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Patent number: 6253053Abstract: A developer roll sleeve and method for making the same is disclosed. In a preferred embodiment, a core substrate roll is spray coated with a conductive composition including a host resin composition and a wear-resistance imparting additive. Preferably, the host resin composition includes a phenolic thermosetting resin and a conductivity additive such as carbon black, graphite and the like. Further, the wear resistance imparting additive is preferably selected from the group consisting of a polytetrafluoroethylene resin (e.g., Teflon), graphite, ultra-high molecular weight polyethylene having a molecular weight from about 3,000 to about 4,500 grams, molybdenum, molybdenum disulfide, silicone and mixtures thereof. The wear resistance imparting additive is preferably provided in an amount sufficient to obtain a thickness wear rate of less than about 0.00047 percent per printing cycle.Type: GrantFiled: January 11, 2000Date of Patent: June 26, 2001Assignee: Xerox CorporationInventors: Alan M. Litman, Michael F. Zona, Rafael Malespin
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Patent number: 5758242Abstract: A developer roll for use in an electrophotographic printing machine of the type having an electrostatic latent image recorded on a photoconductive member in which a magnetic field attracts magnetic particles to form a magnetic brush on the periphery of a developer roll assembly. The developer roll assembly includes a sleeve and the developer roll. The developer roll is located at least partially within the sleeve. The developer roll includes a core having a core feature and a magnetic member having a member feature. The core feature and the member feature cooperate with each other so that the member and the core are mechanically interlocked with each other.Type: GrantFiled: September 23, 1996Date of Patent: May 26, 1998Assignee: Xerox CorporationInventors: Rafael Malespin, Alan M. Litman
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Patent number: 5655196Abstract: A developer roll for use in an electrophotographic printing machine of the type having an electrostatic latent image recorded on a photoconductive member in which a voltage differential is applied between the roll and a region adjacent the roll is provided. The developer roll includes a wound roll of media and a layer of resin. The wound roll is formed from a sheet of the media. The layer of resin is applied to the periphery of the wound roll. The layer of resin and the roll of media are selected of materials to obtain a decay rate relating to the electrical response of the layer of resin to the applied voltage differential.Type: GrantFiled: May 28, 1996Date of Patent: August 5, 1997Assignee: Xerox CorporationInventors: Alan M. Litman, Rafael Malespin