Patents by Inventor George Duncan
George Duncan 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: 6782699Abstract: A hydrostatic transaxle axle assembly for a vehicle has the housing is formed by three housing members, two of which are preferably separable on a parting plane coincident with the longitudinal axes of the axle shafts. One of the housing members being provided with an opening to allow a portion of one of the other housing members to extend through, and where the extending housing member contains within its interior a number of internal fluid passages for fluidly connecting the hydraulic pump to the hydraulic motor.Type: GrantFiled: April 30, 2002Date of Patent: August 31, 2004Assignee: Hydro-Thoma LimitedInventors: Christian Helmut Thoma, George Duncan McRae Arnold
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Patent number: 6779421Abstract: A hydrostatic transmission and gear transmission located in the same or separate housings structures, and mechanically drivingly connected together by a power transmission shaft. That housing structure surrounding the hydrostatic transmission defining a first internal volume containing the hydrostatic transmission components and providing a receptacle for the hydrostatic fluid. That housing structure surrounding the gear transmission defining a gear compartment sump. As one example, the housing structure surrounding the hydrostatic transmission may further define a second internal volume to operate as an overflow receiver for fluid transferred from the first internal volume. A duct operating in accordance with the siphon principle connects the internal volumes and where a pressure restriction valves ensures an above ambient pressure level in the volumes when the hydrostatic and gear transmission is operating. Alternatively, the gear compartment sump may act as the second internal volume.Type: GrantFiled: May 29, 2003Date of Patent: August 24, 2004Assignee: Hydro-Thoma LimitedInventors: George Duncan McRae Arnold, Christian Helmut Thoma
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Patent number: 6768995Abstract: An enterprise business planning system includes a database having a relational data area and a transactional data area, and a server to store within the transactional data area contribution data received from a set of enterprise contributors. The server publishes the contribution data from the transactional data area to the relational data area. The transactional data area may include a set of contribution slots and a set of aggregations slots hierarchically related in accordance with an enterprise model. The relational area includes a set of related tables defined in accordance with the model. The transactional data area supports real-time interaction with the enterprise contributors, while the relational data area allows detailed statistical analysis and report generation.Type: GrantFiled: September 30, 2002Date of Patent: July 27, 2004Assignee: Adaytum, Inc.Inventors: Adam Thier, Jon M Sandles, George Duncan Pearson, Michael Gould
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Publication number: 20040138942Abstract: An enterprise business planning system includes an application server to execute an enterprise planning session for a set of enterprise contributors in accordance with an enterprise model. The enterprise model defines hierarchically arranged nodes, and associates the enterprise contributors with the nodes. The system further comprises an administration console that supports node-level modification of the enterprise planning model without preventing execution of the enterprise planning session by the application server.Type: ApplicationFiled: September 30, 2003Publication date: July 15, 2004Inventors: George Duncan Pearson, Michael Gould, David S. Bowen, Dorian Baverstock
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Publication number: 20040064349Abstract: An enterprise planning system includes a plurality of application servers, and an administration console to generate a deployment map that associates each of a set of enterprise planning models with a respective set of the application servers. The administration console, either automatically or in response to input from a system administrator, may finely control the allocation of computing resources to enterprise planning. The administrator console may adjust the deployment map based on approaching deadlines for the enterprise planning activities. When administrating a task associated with an enterprise planning activity, the administration console may break the task into a number of jobs, each job associated with a different slice of the model in accordance with the organizational hierarchy defined by the model. Consequently, allocation of computing resources to enterprise planning may be finely controlled, and may be adjusted to meet the current needs within the organizational hierarchy.Type: ApplicationFiled: September 30, 2002Publication date: April 1, 2004Inventors: Brian S. Humenansky, David S. Bowen, George Duncan Pearson, Jon M. Sandles, Clarence A. Aschenbrener, Mark Antrobus
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Publication number: 20040064327Abstract: An enterprise business planning system includes a server to execute an enterprise planning session for a set of enterprise contributors in accordance with an enterprise model, wherein the enterprise model defines hierarchically arranged nodes and associates the enterprise contributors with the nodes. The system further comprises a web browser executing on a remote computing device of one of the enterprise contributors to communicate contribution data between the remote computing device and the server, and an inline compression module executing on the remote computing device. The inline compression module automatically compresses outbound communications from the web browser to the server, and automatically decompresses inbound communication received from the server and forwards the decompressed inbound communications to the web browser.Type: ApplicationFiled: September 30, 2002Publication date: April 1, 2004Inventors: Brian S. Humenansky, George Duncan Pearson, Michael C. Mills
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Publication number: 20040064433Abstract: An enterprise business planning system includes a database having a relational data area and a transactional data area, and a server to store within the transactional data area contribution data received from a set of enterprise contributors. The server publishes the contribution data from the transactional data area to the relational data area. The transactional data area may include a set of contribution slots and a set of aggregations slots hierarchically related in accordance with an enterprise model. The relational area includes a set of related tables defined in accordance with the model. The transactional data area supports real-time interaction with the enterprise contributors, while the relational data area allows detailed statistical analysis and report generation.Type: ApplicationFiled: September 30, 2002Publication date: April 1, 2004Inventors: Adam Thier, Jon M. Sandles, George Duncan Pearson, Michael Gould
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Publication number: 20030216208Abstract: A hydrostatic transaxle axle assembly for a vehicle such as a grass mowing lawn or garden tractor comprising a housing for an internally disposed hydrostatic transmission having a variable-displacement hydraulic pump fluidly connected to a fixed-displacement hydraulic motor, the hydraulic motor being connected by differential gearing to axle shafts supported in the housing. The housing is formed by three housing members, two of which are preferably separable on a parting plane coincident with the longitudinal axes of the axle shafts. One of the housing members being provided with an opening to allow a portion of one of the other housing members to extend through, and where the extending housing member contains within its interior a number of internal fluid passages for fluidly connecting the hydraulic pump to the hydraulic motor.Type: ApplicationFiled: June 18, 2003Publication date: November 20, 2003Applicant: HYDRO-THOMA LIMITEDInventors: Christian Helmut Thoma, George Duncan McRae Arnold
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Publication number: 20030199354Abstract: An axle assembly for use in lawn tractors, pedestrian walk-behind mowers and snow blowers in the form of a housing having an internally disposed hydrostatic transmission and speed reducing gearing. An input shaft supported in the housing for driving a variable-displacement hydraulic pump of the hydrostatic transmission, the pump fluidly coupled to a fixed-displacement hydraulic motor of the hydrostatic transmission, and where the motor is drivingly connected through the speed reducing gearing to an output axle shaft or shafts. A mechanical differential disposed within said housing for applications requiring differential speeds of said axle output shafts. The housing being formed by three housing members and joined together along a substantially planar and horizontally peripheral seam formed therebetween such that two of said housing members are to one side of said seam and join with the third housing element.Type: ApplicationFiled: June 6, 2003Publication date: October 23, 2003Applicant: HYDRO-THOMA LIMITEDInventors: Christian Helmut Thoma, George Duncan McRae Arnold
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Publication number: 20030192402Abstract: A hydrostatic transmission and gear transmission located in the same or separate housings structures, and mechanically drivingly connected together by a power transmission shaft. That housing structure surrounding the hydrostatic transmission defining a first internal volume containing the hydrostatic transmission components and providing a receptacle for the hydrostatic fluid. That housing structure surrounding the gear transmission defining a gear compartment sump. As one example, the housing structure surrounding the hydrostatic transmission may further define a second internal volume to operate as an overflow receiver for fluid transferred from the first internal volume. A duct operating in accordance with the siphon principle connects the internal volumes and where a pressure restriction valves ensures an above ambient pressure level in the volumes when the hydrostatic and gear transmission is operating. Alternatively, the gear compartment sump may act as the second internal volume.Type: ApplicationFiled: May 29, 2003Publication date: October 16, 2003Applicant: HYDRO-THOMA LIMITEDInventors: George Duncan McRae Arnold, Christian Helmut Thoma
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Patent number: 6626065Abstract: A hydrostatic transmission and gear transmission located in the same or separate housings structures, and mechanically drivingly connected together by a power transmission shaft. That housing structure surrounding the hydrostatic transmission defining a first internal volume containing the hydrostatic transmission components and providing a receptacle for the hydrostatic fluid. That housing structure surrounding the gear transmission defining a gear compartment sump. As one example, the housing structure surrounding the hydrostatic transmission may further define a second internal volume to operate as an overflow receiver for fluid transferred from the first internal volume. A duct operating in accordance with the siphon principle connects the internal volumes and where a pressure restriction valves ensures an above ambient pressure level in the volumes when the hydrostatic and gear transmission is operating. Alternatively, the gear compartment sump may act as the second internal volume.Type: GrantFiled: May 15, 2001Date of Patent: September 30, 2003Assignee: Hydro-Thoma LimitedInventors: George Duncan McRae Arnold, Christian Helmut Thoma
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Patent number: 6607462Abstract: An axle assembly for use in lawn tractors, pedestrian walk-behind mowers and snow blowers in the form of a housing having an internally disposed hydrostatic transmission and speed reducing gearing. An input shaft supported in the housing for driving a variable-displacement hydraulic pump of the hydrostatic transmission, the pump fluidly coupled to a fixed-displacement hydraulic motor of the hydrostatic transmission, and where the motor is drivingly connected through the speed reducing gearing to an output axle shaft or shafts. A mechanical differential disposed within said housing for applications requiring differential speeds of said axle output shafts. The housing being formed by three housing members and joined together along a substantially planar and horizontally peripheral seam formed therebetween such that two of said housing members are to one side of said seam and join with the third housing element.Type: GrantFiled: February 11, 2002Date of Patent: August 19, 2003Assignee: Hydro-Thoma LimitedInventors: Christian Helmut Thoma, George Duncan McRae Arnold
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Patent number: 6564550Abstract: A hydrostatic transaxle axle assembly for a vehicle has the housing is formed by three housing members, two of which are preferably separable on a parting plane coincident with the longitudinal axes of the axle shafts. One of the housing members being provided with an opening to allow a portion of one of the other housing members to extend through, and where the extending housing member contains within its interior a number of internal fluid passages for fluidly connecting the hydraulic pump to the hydraulic motor.Type: GrantFiled: April 30, 2002Date of Patent: May 20, 2003Assignee: Hydro-Thoma LimitedInventors: Christian Helmut Thoma, George Duncan McRae Arnold
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Publication number: 20020189251Abstract: A hydrostatic transaxle axle assembly for a vehicle such as a grass mowing lawn or garden tractor comprising a housing for an internally disposed hydrostatic transmission having a variable-displacement hydraulic pump fluidly connected to a fixed-displacement hydraulic motor, the hydraulic motor being connected by differential gearing to axle shafts supported in the housing. The housing is formed by three housing members, two of which are preferably separable on a parting plane coincident with the longitudinal axes of the axle shafts. One of the housing members being provided with an opening to allow a portion of one of the other housing members to extend through, and where the extending housing member contains within its interior a number of internal fluid passages for fluidly connecting the hydraulic pump to the hydraulic motor.Type: ApplicationFiled: July 25, 2002Publication date: December 19, 2002Applicant: HYDRO-THOMA LIMITEDInventors: Christian Helmut Thoma, George Duncan McRae Arnold
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Publication number: 20020173398Abstract: A hydrostatic transmission connected by means of a power transmission shaft to a speed reducing transmission, the housing structure surrounding said transmissions defining a first and second internal volumes. The first internal volume providing a receptacle for the hydrostatic fluid and for containing the hydrostatic transmission components. The second internal volume, which may or may not contain the gear train components, operates as an overflow receiver for fluid transferred from the first internal volume. A duct disposed in the housing provides the only flow path between the volumes and any fluid volume change in the first internal volume due to temperature variation is translated in a change in depth in the overflow receiver. Preferably, the duct operates in accordance to the siphon principle and catering for fluid volume change internally is a significant improvement over current practice where reliance is placed on external paraphernalia to achieve this end.Type: ApplicationFiled: May 15, 2001Publication date: November 21, 2002Applicant: Hydro-Thoma LimitedInventors: George Duncan McRae Arnold, Christaian Helmut Thoma
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Patent number: 6477838Abstract: An improved hydrostatic transmission useful as a speed changing device having a single output shaft or a pair of outwardly extending shafts for use, for example, in small vehicles such as lawn and garden tractors. The hydrostatic transmission output may be mechanically coupled to the wheel driving axle by a gear or chain drive, or alternatively may have such means included in the same housing package containing the hydrostatic transmission. When a differential action is needed between the drive wheels of the vehicle, the differential may then also be included in the same housing package. In whichever of such configurations, the hydrostatic transmission comprises a radial piston pump fluidly coupled to a single or twin larger displacement axial piston motor of the swash-plate type by means of a fluid coupling valve supported by the housing.Type: GrantFiled: November 28, 2000Date of Patent: November 12, 2002Assignee: Hydro-Thoma LimitedInventors: Christian Helmut Thoma, George Duncan MacRae Arnold
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Publication number: 20020116923Abstract: A hydrostatic transaxle axle assembly for a vehicle such as a grass mowing lawn or garden tractor comprising a housing for an internally disposed hydrostatic transmission having a variable-displacement hydraulic pump fluidly connected to a fixed-displacement hydraulic motor, the hydraulic motor being connected by differential gearing to axle shafts supported in the housing. The housing is formed by three housing members, two of which are preferably separable on a parting plane coincident with the longitudinal axes of the axle shafts. One of the housing members being provided with an opening to allow a portion of one of the other housing members to extend through, and where the extending housing member contains within its interior a number of internal fluid passages for fluidly connecting the hydraulic pump to the hydraulic motor.Type: ApplicationFiled: April 30, 2002Publication date: August 29, 2002Applicant: HYDRO-THOMA LIMITEDInventors: Christian Helmut Thoma, George Duncan McRae Arnold
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Publication number: 20020115519Abstract: An axle assembly for use in lawn tractors, pedestrian walk-behind mowers and snow blowers in the form of a housing having an internally disposed hydrostatic transmission and speed reducing gearing. An input shaft supported in the housing for driving a variable-displacement hydraulic pump of the hydrostatic transmission, the pump fluidly coupled to a fixed-displacement hydraulic motor of the hydrostatic transmission, and where the motor is drivingly connected through the speed reducing gearing to an output axle shaft or shafts. A mechanical differential disposed within said housing for applications requiring differential speeds of said axle output shafts. The housing being formed by three housing members and joined together along a substantially planar and horizontally peripheral seam formed therebetween such that two of said housing members are to one side of said seam and join with the third housing element.Type: ApplicationFiled: February 11, 2002Publication date: August 22, 2002Applicant: HYDRO-THOMA LIMITEDInventors: Christian Helmut Thoma, George Duncan McRae Arnold
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Patent number: 6427442Abstract: A hydrostatic transaxle axle assembly for a vehicle such as a grass mowing lawn or garden tractor comprising a housing for an internally disposed hydrostatic transmission having a variable-displacement hydraulic pump fluidly connected to a fixed-displacement hydraulic motor, the hydraulic motor being connected by differential gearing to axle shafts supported in the housing. The housing is formed by three housing members, two of which are preferably separable on a parting plane coincident with the longitudinal axes of the axle shafts. One of the housing members being provided with an opening to allow a portion of one of the other housing members to extend through, and where the extending housing member contains within its interior a number of internal fluid passages for fluidly connecting the hydraulic pump to the hydraulic motor.Type: GrantFiled: March 23, 2001Date of Patent: August 6, 2002Assignee: Hydro-Thoma LimitedInventors: Christian Helmut Thoma, George Duncan McRae Arnold
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Patent number: 6346059Abstract: An axle assembly for use in lawn tractors, pedestrian walk-behind mowers and snow blowers in the form of a housing having an internally disposed hydrostatic transmission and speed reducing gearing. An input shaft supported in the housing for driving a variable-displacement hydraulic pump of the hydrostatic transmission, the pump fluidly coupled to a fixed-displacement hydraulic motor of the hydrostatic transmission, and where the motor is drivingly connected through the speed reducing gearing to an output axle shaft or shafts. A mechanical differential disposed within said housing for applications requiring differential speeds of said axle output shafts. The housing being formed by three housing members and joined together along a substantially planar and horizontally peripheral seam formed there between such that two of said housing members are to one side of said seam and join with the third housing element.Type: GrantFiled: April 17, 2000Date of Patent: February 12, 2002Assignee: Hydro-Thoma LimitedInventors: Christian Helmut Thoma, George Duncan McRae Arnold