Patents by Inventor Alpha N. Doan
Alpha N. Doan 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: 6433897Abstract: In a scanning unit such as a facsimile machine, an automatic document feeder transports individual sheets from a stack of documents along a document path over a scanning window to an output tray. An upper guide member includes an integrated chassis which provides most of the functional features required for picking individual sheets from a stack of documents in an input tray and transporting the sheet past a scanning window. The various components incorporated in the integrated chassis include a document separation mechanism, pre-scanning pinch rollers, post-scanning pinch rollers, a spring-loaded limiter with minimal paper path obstruction, a hinging mechanism to facilitate manual access to the document path, a latching mechanism, referencing datums, and ESD grounding including ESD brushes adjacent the document path and an ESD shield for a circuit board housed in the upper guide member.Type: GrantFiled: November 10, 2000Date of Patent: August 13, 2002Assignee: Hewlett-Packard CompanyInventors: Darren W. Wilcox, Alpha N. Doan, Dennis Sonnenburg
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Patent number: 6151140Abstract: In a scanning unit such as a facsimile machine, an automatic document feeder transports individual sheets from a stack of documents along a document path over a scanning window to an output tray. An upper guide member includes an integrated chassis which provides most of the functional features required for picking individual sheets from a stack of documents in an input tray and transporting the sheet past a scanning window. The various components incorporated in the integrated chassis include a document separation mechanism, pre-scanning pinch rollers, post-scanning pinch rollers, a spring-loaded limiter with minimal paper path obstruction, a hinging mechanism to facilitate manual access to the document path, a latching mechanism, referencing datums, and ESD grounding including ESD brushes adjacent the document path and an ESD shield for a circuit board housed in the upper guide member.Type: GrantFiled: April 29, 1997Date of Patent: November 21, 2000Assignee: Hewlett-Packard CompanyInventors: Darren W. Wilcox, Alpha N. Doan, Dennis Sonnenburg
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Patent number: 5764384Abstract: In a scanning unit such as a facsimile machine, an automatic document feeder transports individual sheets from a stack of documents along a document path over a scanning window to an output tray. An upper guide member includes an integrated chassis which provides most of the functional features required for picking individual sheets from a stack of documents in an input tray and transporting the sheet past a scanning window. The various components incorporated in the integrated chassis include a document separation mechanism, pre-scanning pinch rollers, post-scanning pinch rollers, a spring-loaded limiter with minimal paper path obstruction, a hinging mechanism to facilitate manual access to the document path, a latching mechanism, referencing datums, and ESD grounding including ESD brushes adjacent the document path and an ESD shield for a circuit board housed in the upper guide member.Type: GrantFiled: October 17, 1994Date of Patent: June 9, 1998Assignee: Hewlett-Packard CompanyInventors: Darren W. Wilcox, Alpha N. Doan, Dennis Sonnenburg
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Patent number: 5742304Abstract: A color ink jet printer including a print carriage movable along a carriage scan axis, a plurality of non-black color printing ink jet printheads supported by the print carriage and offset relative to each other so that their nozzle arrays are non-overlapping along the media scan axis, and a black printing ink jet printhead having a nozzle array that overlaps along the media axis with one of the nozzle arrays of the non-black color printing ink jet printheads, whereby as the carriage is scanned along the carriage scan axis the nozzle arrays of the non-black color printing ink jet printheads traverse non-overlapping print regions and the nozzle array of the black printing printhead traverses a print region that overlaps one of the non-overlapping print regions traversed by the nozzle arrays of the non-black color printing ink jet printheads.Type: GrantFiled: June 28, 1996Date of Patent: April 21, 1998Assignee: Hewlett-Packard CompanyInventors: Brent W. Richtsmeier, Alpha N. Doan, Mark S. Hickman
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Patent number: 5583550Abstract: Ink-jet images are improved by printing groups of adjacent pixels with clusters of overlapping ink drops for resisting random ink drop coalescence that would lead to a mottled image.Type: GrantFiled: November 24, 1993Date of Patent: December 10, 1996Assignee: Hewlett-Packard CompanyInventors: Mark S. Hickman, Peter C. Morris, Alpha N. Doan
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Patent number: 5547179Abstract: In a scanning unit such as a facsimile machine, an automatic document feeder transports individual sheets from a stack of documents along a document path over a scanning window to an output tray. An upper guide member includes an integrated rigid chassis for positioning document control components adjacent the scanning window. The document control components included a central pre-scanning pinch roller, a full width hold-down limiter, and a central post-scanning pinch roller which are each mounted with their own separate biasing springs on the integrated chassis. Two elongated wire springs respectively engage both ends of the hold-down limiter, while two sets of cantilever leaf springs provide strong and weak spring biasing, respectively, to the pre-scanning and post-scanning pinch rollers.Type: GrantFiled: October 17, 1994Date of Patent: August 20, 1996Assignee: Hewlett-Packard CompanyInventors: Darren W. Wilcox, Alpha N. Doan
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Patent number: 5376958Abstract: A color ink jet printer including a print carriage movable along a carriage scan axis and a plurality of color producing ink jet printheads supported by the print carriage and offset relative to each other so that their nozzle arrays are non-overlapping along the media scan axis, such that the nozzle arrays of the ink jet printheads traverse non-overlapping regions as the carriage is scanned along the carriage scan axis.Type: GrantFiled: May 1, 1992Date of Patent: December 27, 1994Assignee: Hewlett-Packard CompanyInventors: Brent W. Richtsmeier, Alpha N. Doan, Mark S. Hickman
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Patent number: 4967203Abstract: Quality of printed images as produced by an ink-jet printer (10) is improved by staggering applications of ink dots (30) to pixel locations (36) such that overlapping ink dots are printed on successive passes of a printhead (16) and such that swaths (38) are partially printed on overlapping passes of the printhead. Quality of multi-colored or multi-shaded images is further improved by grouping pixels (36) into super pixels (42), and applying various combinations of colored ink dots to the various pixels within each super pixel in a staggered sequence.Type: GrantFiled: September 29, 1989Date of Patent: October 30, 1990Assignee: Hewlett-Packard CompanyInventors: Alpha N. Doan, Anthony D. Parkhurst
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Patent number: 4865478Abstract: A retractable pin sprocket drive for feeding paper employs free floating, radially moving, cam actuated sprocket pins in axially spaced sprocket hubs forming sprocket wheels. The pins are slidably fitted in equally angularly spaced radial slots in each sprocket hub. The sprocket wheels are each journalled in a sprocket wheel housing and the sprocket pins are moved radially only by a stationary cam track in each sprocket housing as the sprocket wheels rotate. Insertion of paper having perforated edges is facilitated by means providing for the precise axial spacing of the sprocket wheels and angular positioning of the sprocket wheels and pins in relation to the perforations or holes along the edges of the paper, together with transparent sprocket wheel housings and openings therethrough permitting viewing of the sprocket pins and the holes in the paper as they come together, to permit precise sprocket pin insertion into the holes in the paper.Type: GrantFiled: July 23, 1987Date of Patent: September 12, 1989Assignee: Hewlett Packard CompanyInventors: Lawrence W. Chan, Alpha N. Doan, Curt N. Torgerson, Paul J. Wield