Patents by Inventor John W. May
John W. May 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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Publication number: 20040093476Abstract: A system for detecting/avoiding memory usage conflicts when generating and merging multi-threaded software test cases. Initially, a test case generator is given a unique segment of memory which it can use. A plurality of test cases are generated, one at a time, by the test case generator. When the first test case is generated, the memory segment used is noted. When each of the second through Nth test cases is generated, a memory segment of the same size as the first test case, but not overlapping that of the previously assigned test case(s), is assigned to each subsequent test case.Type: ApplicationFiled: November 11, 2002Publication date: May 13, 2004Inventors: Ryan C. Thompson, John W. May
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Publication number: 20040093537Abstract: A system for indicating attempts by a computer program to free memory that is not currently allocated, as well as indicating allocated memory that is never freed. In a particular software program, the programmer includes code that prints a short debug message to a text file every time that a memory allocation or a free-memory operation takes place. After the program completes execution, the text file contains a list of messages indicating all occurrences of memory allocation or free-memory operations. An automated parsing function examines the text file and provides error indications when memory allocation or de-allocation errors are detected.Type: ApplicationFiled: November 11, 2002Publication date: May 13, 2004Inventors: Ryan C. Thompson, John W. May
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Publication number: 20040078699Abstract: A system for preventing translation cache/translation register initialization conflicts in dual-threaded computer processor architecture test cases. When each test case is generated, the test case generator is given a number T representing the total number translation cache entries and translation register entries which it can use. A first test case thread and a second test case thread are generated to produce a number of translation register entries and the number of translation cache entries equal to a value of no greater than T/4. Each of the translation register entries for the first test case thread and for the second test case thread is then moved to mutually exclusive slots in a range from 0 through (T/2−1). Finally, the translation cache entries for the first test case thread are moved to mutually exclusive slots (T−1) through T/2.Type: ApplicationFiled: September 18, 2002Publication date: April 22, 2004Inventors: Ryan C. Thompson, John W. May
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Patent number: 6605399Abstract: A photoconductive sleeved primary image-forming member roller for use in an electrophotographic machine comprising a central member including a rigid cylindrical core member and a compliant layer formed on the core member; and a flexible, replaceable, removable, photoconductive sleeve member in the form of an endless tubular belt that surrounds and nonadhesively intimately contacts the central member.Type: GrantFiled: October 22, 2002Date of Patent: August 12, 2003Assignee: NexPress Solutions LLCInventors: Arun Chowdry, Steven Cormier, Dennis Grabb, Diane M. Herrick, John W. May, Edward T. Miskinis, Michel F. Molaire, Biao Tan, Thomas N. Tombs
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Patent number: 6567641Abstract: A conformable roller for use in a fusing station of an electrostatographic machine, the fusing station being provided with a pressure roller and a fuser roller for fusing a toner image on a receiver, the fuser roller made from a plurality of layers surrounding an axis of rotation, the conformable roller comprising a rigid cylindrically symmetric core member; a flexible replaceable removable compliant sleeve member in the form of a tubular belt surrounding and nonadhesively intimately contacting the core member; and the fusing station including an external heat source for the fuser roller, at least one of the plurality of layers being thermally resistive.Type: GrantFiled: October 4, 2000Date of Patent: May 20, 2003Assignee: NexPress Solutions LLCInventors: Muhammed Aslam, Jiann-Hsing Chen, Arun Chowdry, John W. May, Borden H. Mills, Alan R. Priebe, Kenneth D. Stack, Biao Tan, Joseph A. Pavlisko
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Patent number: 6556798Abstract: A method and apparatus for controlling image defects associated with overdrive or underdrive, and variations thereof, in an electrostatographic machine. A speed modifying force is transmitted to a conformable member that deforms in a nip, thereby inducing strains in the surface of the member at the nip which cancel or controllably reduce the strains caused by engagement in the nip. The speed modifying force may be an externally applied drag force or torque, and may be applied using an open loop or a feedback system including an electromagnetic brake, a motor, etc. The speed modifying force may be applied to a conformable member forming the nip through a redundant linkage of the system that employs gears or other suitable mechanisms.Type: GrantFiled: February 16, 2001Date of Patent: April 29, 2003Inventors: Donald S. Rimai, David J. Quesnel, John W. May
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Patent number: 6549745Abstract: Controlling image defects related to transfer or fusing of toner images in an electrostatographic machine, wherein engagement between an operational surface of a toner image bearing member or fusing member and an operational surface of another member forming a nip is adjusted using an engagement adjustment device in order to reduce or eliminate image defects relating to an overdrive or underdrive associated with the nip. The engagement adjustment device provides a preselected amount of overdrive or underdrive between a toner image bearing member or fusing member and a receiver member, which preselected amount includes zero.Type: GrantFiled: February 16, 2001Date of Patent: April 15, 2003Assignee: NexPress Solutions LLCInventors: John W. May, David J. Quesnel, Andreas Dickhoff, Donald S. Rimai, Thomas N. Tombs
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Patent number: 6541171Abstract: A photoconductive sleeved primary image-forming member roller for use in an electrophotographic machine comprising a central member including a rigid cylindrical core member and a compliant layer formed on the core member; and a flexible replaceable removable photoconductive sleeve member in the form of an endless tubular belt that surrounds and non-adhesively intimately contacts the central member.Type: GrantFiled: October 4, 2000Date of Patent: April 1, 2003Assignee: NexPress Solutions LLCInventors: Arun Chowdry, Steven Cormier, Dennis Grabb, Diane M. Herrick, John W. May, Edward T. Miskinis, Michel F. Molaire, Biao Tan, Thomas N. Tombs
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Publication number: 20030044704Abstract: A photoconductive sleeved primary image forming member roller for use in an electrophotographic machine comprising a central member including a rigid cylindrical core member and a compliant layer formed on the core member; and a flexible replaceable removable photoconductive sleeve member in the form of an endless tubular belt that surrounds and nonadhesively intimately contacts the central member.Type: ApplicationFiled: October 22, 2002Publication date: March 6, 2003Inventors: Arun Chowdry, Steven Cormier, Dennis Grabb, Diane M. Herrick, John W. May, Edward T. Miskinis, Michel F. Molaire, Biao Tan, Thomas N. Tombs
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Patent number: 6490430Abstract: A conformable roller for use in a fusing station of an electrostatographic machine, said fusing station being provided with a pressure roller for fusing a toner image on a receiver, said fuser roller made from a plurality of layers surrounding an axis of rotation, said conformable roller comprising a rigid cylindrically symmetric core member; a compliant base-cushion layer formed on the core member; a stiffening layer in intimate contact with and surrounding the base-cushion layer; a compliant release layer coated on the stiffening layer; and said fusing station including an external heat source for said fuser roller, at least one of said plurality of layers being thermally resistive.Type: GrantFiled: October 4, 2000Date of Patent: December 3, 2002Assignee: NexPress Solutions LLCInventors: Jiann-Hsing Chen, Arun Chowdry, James E. Mathers, John W. May, Borden H. Mills, Alan R. Priebe, Kenneth D. Stack
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Patent number: 6463250Abstract: A deformable toner fuser roller, for use in a fusing station of an electrostatographic machine comprising a rigid cylindrical core member; an overdrive-controlling, elastically deformable structure surrounding the core member; and wherein the fuser roller is adapted to be heated by a heat source external to the roller and the overdrive-controlling elastically deformable structure comprises an effective or operational Poisson's ratio between 0.2 and 0.4.Type: GrantFiled: October 4, 2000Date of Patent: October 8, 2002Assignee: Nexpress Solutions LLCInventors: Jiann-Hsing Chen, Arun Chowdry, John W. May, Borden H. Mills, David Quesnel, Donald S. Rimai
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Patent number: 6456816Abstract: An intermediate transfer roller that functions as an image receiving member within a reproduction apparatus having a rigid cylindrical core member and at least one layer of an elastically deformable structure surrounding the core member, the elastically deformable structure preferably has an effective Poisson's ratio in the range of 0.2 to 0.4.Type: GrantFiled: October 4, 2000Date of Patent: September 24, 2002Assignee: NexPress Solutions LLCInventors: Arun Chowdry, Steven Cormier, John W. May, Borden H. Mills, Bonnie Patterson, David J. Quesnel, Donald S. Rimai, Kenneth D. Stack
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Publication number: 20020114650Abstract: A method and apparatus are disclosed for controlling image defects related to transfer of toner images in an electrostatographic machine. An engagement between an operational surface of a toner image bearing member and an operational surface of another member forming a transfer nip is adjusted using an engagement adjustment device in order to reduce or eliminate image defects relating to an overdrive or underdrive associated with the nip. A transfer nip for transferring a toner image may include two rollers supported by parallel shafts coaxial with each roller, the shafts separated by a controllable distance of separation and the engagement in the nip being controllably adjustable by an engagement adjustment device to increase or decrease the distance of separation.Type: ApplicationFiled: February 16, 2001Publication date: August 22, 2002Applicant: NexPress Solutions LLCInventors: John W. May, David J. Quesnel, Andreas Dickhoff, Donald S. Rimai, Thomas N. Tombs
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Publication number: 20020114642Abstract: A method and apparatus are disclosed for controlling image defects associated with overdrive or underdrive and variations thereof in an electrostatographic machine, the defects related to transfer and fusing of toner images. A speed modifying fore is transmitted to a conformable member that deforms in a nip, thereby inducing strains in the surface of the member at the nip which cancel or controllably reduce the strains caused by engagement in the nip. The speed modifying fore may be an externally applied drag force, such as for example a friction force, and may be applied using an open loop or a feedback system including an electromagnetic brake, a motor, etc. Alternatively, the speed modifying force may be produced by a controllable torque applied for example by a torque generator to an axle of a roller included in a frictionally driven system of rollers.Type: ApplicationFiled: February 16, 2001Publication date: August 22, 2002Applicant: NexPress Solutions LLCInventors: Donald S. Rimai, David J. Quesnel, John W. May
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Patent number: 6393249Abstract: A conformable roller for use in a fusing station of an electrostatographic machine, the fusing station being provided with a pressure roller and a fuser roller for fusing a toner image on a receiver, the fuser roller made from a plurality of layers surrounding an axis of rotation, the conformable roller including a rigid cylindrically symmetric core member; a flexible replaceable removable compliant sleeve member in the form of a tubular belt surrounding and nonadhesively intimately contacting the core member; and the fusing station including an internal heat source for the fuser roller, at least one of the plurality of layers being thermally conductive.Type: GrantFiled: October 4, 2000Date of Patent: May 21, 2002Assignee: Nexpress Solutions LLCInventors: Muhammed Aslam, Jiann-Hsing Chen, Arun Chowdry, James E. Mathers, John W. May, Borden H. Mills, Alan R. Priebe, Kenneth D. Stack, Joseph A. Pavlisko
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Patent number: 6393247Abstract: A product and process for forming an internally heated roller configuration for use in an electrostatographic machine that employs a fuser roller and a pressure roller. One of the rollers is a conformable roller having a rigid cylindrical core member centered on an axis of rotation, a compliant base cushion layer formed on the core member; a stiffening layer in intimate contact with and surrounding the base cushion layer; and an internal heating mechanism, while the other roller is a hard roller.Type: GrantFiled: October 4, 2000Date of Patent: May 21, 2002Assignee: NexPress Solutions LLCInventors: Jiann-Hsing Chen, Arun Chowdry, James E. Mathers, John W. May, Borden H. Mills, Alan R. Priebe, Kenneth D. Stack
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Patent number: 6377772Abstract: In accordance with the invention, there is provided a reproduction method including forming a toner image on a moving primary image-forming member (PIFM) which is a first double-sleeved roller including a rigid cylindrical core member, a replaceable removable compliant inner sleeve member (ISM) in nonadhesive intimate contact with and surrounding the core member, and a replaceable removable photoconductive outer sleeve member (OSM) in nonadhesive intimate contact with and surrounding the ISM; electrostatically transferring the toner image, from the PIFM to a counter-rotating intermediate transfer member (ITM) which is a second double-sleeved roller, in a first transfer nip width produced by a pressure contact between the PIFM and the ITM, an electric field urging the toner image from the PIFM to the ITM, wherein the ITM includes a rigid cylindrical core member, a compliant ISM in nonadhesive intimate contact with and surrounding the core member, and a compliant resistive OSM in nonadhesive intimate contact wiType: GrantFiled: October 4, 2000Date of Patent: April 23, 2002Assignee: NexPress Solutions LLCInventors: Arun Chowdry, Craig M. Cody, Steven Cormier, Dennis Grabb, Diane M. Herrick, John W. May, Edward T. Miskinis, Michel F. Molaire, Biao Tan, Thomas Tombs, Joseph A. Pavlisko
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Patent number: 6134095Abstract: A particularly configured aperiodic grid for a grid-controlled AC corona charger for uniformly charging a dielectric member, of an electrostatographic reproduction apparatus, moving along a travel path in operative relation to the corona charger. The corona charger includes an insulating housing and an electrically biased grid, in which the grid transparency is larger than a nominal transparency at the upstream edge of the charger grid, transparency is nominal at the center of the grid, and transparency is smaller than nominal at the downstream edge of a charger grid. The invention, which has been demonstrated for negative primary charging, preferably uses a trapezoidal AC waveform having a DC offset for corona excitation, and may be practiced over a large range of process speeds. The invention is also practiced using trapezoidal waveforms having negative duty cycles in the range 50% (conventional AC) to 90% (negative DC).Type: GrantFiled: December 17, 1998Date of Patent: October 17, 2000Inventors: John W. May, Dean R. Smith, David M. Zacher, Bonnie A. Maye, Dennis A. Kenyon, Martin J. Pernesky
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Patent number: 6038120Abstract: A corona charger and method and apparatus for corona charging features an insulative shield and an electrically biased grid electrode spaced from the shield. One or more substantially bare corona wires are located between the grid electrode and the shield. The corona wires are electrically biased with an AC voltage. An electrically biased highly conductive buried floor electrode forms a part of the charger and has a surface located between the one or more corona wires and the shield. An insulating layer is located between the corona wires and the surface of the buried floor electrode so that there is no exposure of the buried floor electrode in a direct line of sight from a corona wire.Type: GrantFiled: September 30, 1998Date of Patent: March 14, 2000Assignee: Eastman Kodak CompanyInventors: John W. May, Martin J. Pernesky, George R. Walgrove
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Patent number: 5966559Abstract: A recording apparatus includes a toner image bearing member and a transfer backing member that define a transfer nip. Pressure is applied in the transfer nip to a receiver member that is in engagement with the toner image bearing member for transfer of a toner image on the toner image bearing member to the receiver member. A sensor senses a parameter related to thickness of the receiver member prior to movement of the receiver member into the nip. An adjustment device is responsive to sensing of the parameter and adjusts nip spacing between the toner image bearing member and the transfer backing member.Type: GrantFiled: September 23, 1997Date of Patent: October 12, 1999Assignee: Eastman Kodak CompanyInventors: John W. May, Donald S. Rimai, Christopher B. Liston