Patents by Inventor David G. Powell
David G. Powell 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: 10759017Abstract: A glideway crowning plate for creating a crown on a cutting edge of a cutting blade with a sharpening jig including a glideway crowning plate having a concaved curved surface of a predetermined radius placed proximate spaced glides of a sharpening jig. The sharpening jig utilizes a flat sharpening plate or a flat sharpening stone and the sharpening jig is side-stroked on the flat sharpening plate or the flat sharpening stone and the glideway crowning plate imposes a curved path of the predetermined radius on the sharpening jig, the cutting blade, and the flat sharpening plate or the flat sharpening stone to create a crown in the cutting edge of a cutting blade.Type: GrantFiled: March 23, 2018Date of Patent: September 1, 2020Inventor: David G. Powell
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Publication number: 20190291231Abstract: A glideway crowning plate for creating a crown on a cutting edge of a cutting blade with a sharpening jig including a glideway crowning plate having a concaved curved surface of a predetermined radius placed proximate spaced glides of a sharpening jig. The sharpening jig utilizes a flat sharpening plate or a flat sharpening stone and the sharpening jig is side-stroked on the flat sharpening plate or the flat sharpening stone and the glideway crowning plate imposes a curved path of the predetermined radius on the sharpening jig, the cutting blade, and the flat sharpening plate or the flat sharpening stone to create a crown in the cutting edge of a cutting blade.Type: ApplicationFiled: March 23, 2018Publication date: September 26, 2019Inventor: David G. Powell
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Patent number: 9221144Abstract: A universal sharpening jig for a cutting blade includes a base plate, a protractor plate coupled to the base plate, an incline plate hingedly coupled to the base plate and slideably connected to the protractor plate, the incline plate configured to secure the cutting blade and configured to set and fix the angle of the incline plate with respect to the base plate to define a sharpening angle of all or a portion of a bevel with respect to a flat back of the cutting blade. A push plate is slideably attached proximate a front of the base plate and co-planar with a bottom surface of the base plate, the push plate configured to position a user-applied force vector thereon and directly apply the force vector closely proximate the intersection of the bevel and an abrasive surface to reduce de-stabilizing moments and user energy need to create a sharpened edge between the bevel and the flat back of the cutting blade.Type: GrantFiled: December 23, 2013Date of Patent: December 29, 2015Inventor: David G. Powell
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Publication number: 20150174723Abstract: A universal sharpening jig for a cutting blade includes a base plate, a protractor plate coupled to the base plate, an incline plate hingedly coupled to the base plate and slideably connected to the protractor plate, the incline plate configured to secure the cutting blade and configured to set and fix the angle of the incline plate with respect to the base plate to define a sharpening angle of all or a portion of a bevel with respect to a flat back of the cutting blade. A push plate is slideably attached proximate a front of the base plate and co-planar with a bottom surface of the base plate, the push plate configured to position a user-applied force vector thereon and directly apply the force vector closely proximate the intersection of the bevel and an abrasive surface to reduce de-stabilizing moments and user energy need to create a sharpened edge between the bevel and the flat back of the cutting blade.Type: ApplicationFiled: December 23, 2013Publication date: June 25, 2015Inventor: David G. Powell
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Patent number: 8529316Abstract: A sharpening apparatus having a slightly convexly or concavely curved abrasive surface, for use in sharpening woodworking tools or in other fields requiring such processing of precision parts or tools. The invention may further employ either cylindrical or conic abrasive surfaces. Cylindrical abrasive surfaces are desirable when a curvature of a fixed radius is desired, or where accuracy of the curvature radius is required. Conic or semi-conic surfaces may be used to enable a user, by means of short sharpening strokes, to achieve an approximate desired curvature among a range of possible curvatures provided along the length of the abrasive surface as the curvature radius progressively declines. In this way, one abrasive surface may be used to achieve a variety of curvatures.Type: GrantFiled: November 23, 2009Date of Patent: September 10, 2013Inventors: David G. Powell, Toshio Odate
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Publication number: 20100075583Abstract: A sharpening apparatus having a slightly convexly or concavely curved abrasive surface, for use in sharpening woodworking tools or in other fields requiring such processing of precision parts or tools. The invention may further employ either cylindrical or conic abrasive surfaces. Cylindrical abrasive surfaces are desirable when a curvature of a fixed radius is desired, or where accuracy of the curvature radius is required. Conic or semi-conic surfaces may be used to enable a user, by means of short sharpening strokes, to achieve an approximate desired curvature among a range of possible curvatures provided along the length of the abrasive surface as the curvature radius progressively declines. In this way, one abrasive surface may be used to achieve a variety of curvatures.Type: ApplicationFiled: November 23, 2009Publication date: March 25, 2010Inventors: David G. Powell, Toshio Odate
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Publication number: 20090204073Abstract: A system and method for degassing a fluid in a syringe comprising and inserting the fluid into a negative pressure device. The system may include a holder for holding the syringe; a guide affixed to the holder; a slide for holding a plunger of the syringe, the slide being movably attached to the guide; and a locking mechanism opposite the holder for maintaining a position of the slide. The fluid degasses when the locking mechanism maintains the position of the slide. The system may also include a piercing element adjacent the holder for piercing the syringe. The system and method may also be used for removing fluid from a negative pressure device.Type: ApplicationFiled: April 20, 2009Publication date: August 13, 2009Inventor: David G. Powell
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Patent number: 7534225Abstract: A system and method for degassing a fluid in a syringe comprising and inserting the fluid into a negative pressure device. The system may include a holder for holding the syringe; a guide affixed to the holder; a slide for holding a plunger of the syringe, the slide being movably attached to the guide; and a locking mechanism opposite the holder for maintaining a position of the slide. The fluid degasses when the locking mechanism maintains the position of the slide. The system may also include a piercing element adjacent the holder for piercing the syringe. The system and method may also be used for removing fluid from a negative pressure device.Type: GrantFiled: August 7, 2003Date of Patent: May 19, 2009Assignee: Medtronic MiniMed, Inc.Inventor: David G. Powell
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Publication number: 20030091810Abstract: A support structure includes a first sheet with perforations having a front surface and a back surface and a second sheet with perforation having a front surface and a back surface. Each-perforation in the first sheet and the second sheet has a portion adjacent to the front surface of the sheet that is wider than a portion of the perforation that is adjacent to the back surface of the sheet. A core made of a first material is formed between the back surface of the first sheet and the back surface of the second sheet and within the perforations to anchor the first sheet and the second sheet to the core. Molded features may be disposed on the front surfaces of the sheets and integrally formed with the core through perforations in the sheets. The support structure may be used in a horizontal base or an end-of-arm tool.Type: ApplicationFiled: December 24, 2002Publication date: May 15, 2003Inventors: Stanley A. Watson, David G. Powell
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Patent number: 6528141Abstract: A support structure includes a first sheet with perforations having a front surface and a back surface and a second sheet with perforation having a front surface and a back surface. Each perforation in the first sheet and the second sheet has a portion adjacent to the front surface of the sheet that is wider than a portion of the perforation that is adjacent to the back surface of the sheet. A core made of a first material is formed between the back surface of the first sheet and the back surface of the second sheet and within the perforations to anchor the first sheet and the second sheet to the core. Molded features may be disposed on the front surfaces of the sheets and integrally formed with the core through perforations in the sheets. The support structure may be used in a horizontal base or an end-of-arm tool.Type: GrantFiled: August 13, 1999Date of Patent: March 4, 2003Assignee: Diamond Machining Technology, Inc.Inventors: Stanley A. Watson, David G. Powell
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Patent number: 6402603Abstract: An abrasive tool includes a first perforated sheet having a front surface and a back surface, and a second perforated sheet having a front surface and a back surface. A first layer of abrasive grains is bonded to the front surface of the first perforated sheet, and a second layer of abrasive grains is bonded to the front surface of the second perforated sheet. A core includes a first wall having an inner surface and an outer surface, a second wall having an inner surface and an outer surface, and a plurality of walls each connected to both the inner surface of the first wall and the inner surface of the second wall to space the first wall from the second wall and to form a plurality of hollow spaces within the core. The back surface of the first perforated sheet is disposed adjacent to the outer surface of the first wall and the back surface of the second perforated sheet is disposed adjacent to the outer surface of the second wall.Type: GrantFiled: December 16, 1999Date of Patent: June 11, 2002Assignee: Diamond Machining Technology, Inc.Inventors: Stanley A. Watson, David G. Powell
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Patent number: 6261167Abstract: An abrasive tool includes a first perforated sheet having a front surface and a back surface, and a second perforated sheet having a front surface and a back surface. A first layer of abrasive grains is bonded to the front surface of the first perforated sheet and a second layer of abrasive grains is bonded to the front surface of the second perforated sheet. A core is made of a first material, the core having a first surface and a second surface, the back surface of the first perforated sheet disposed adjacent to the first surface of the core and the back surface of the second perforated sheet disposed adjacent to the second surface of the core, the core being bonded to the first perforated sheet and the second perforated sheet by forming the core between the first perforated sheet and the second perforated sheet.Type: GrantFiled: December 15, 1998Date of Patent: July 17, 2001Assignee: Diamond Machining Technology, Inc.Inventors: Stanley A. Watson, David G. Powell
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Patent number: 5976001Abstract: An abrasive tool includes a base having an upper surface and a perforated sheet having a lower surface and an upper surface. A layer of abrasive grains is bonded to the upper surface of the perforated sheet. The upper surface of the base is bonded to the lower surface of the perforated sheet by a brazing material. A method of assembling an abrasive tool includes bonding the upper surface of the base and the lower surface of the perforated sheet by brazing the surfaces together and bonding a layer of abrasive grains to the upper surface of the perforated sheet.Type: GrantFiled: April 24, 1997Date of Patent: November 2, 1999Assignee: Diamond Machining Technology, Inc.Inventors: David G. Powell, Stanley A. Watson
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Patent number: 5919084Abstract: An abrasive tool and method for assembling same includes a first base having a front surface and a back surface and a second base having a front surface and a back surface. A first perforated sheet has a front surface and a back surface, the back surface of the first perforated sheet being bonded to the front surface of the first base. A second perforated sheet has a front surface and a back surface, the back surface of the second perforated sheet being bonded to the front surface of the second base. A first layer of abrasive grains is bonded to the front surface of the first perforated sheet, and a second layer of abrasive grains is bonded to the front surface of the second perforated sheet. The back surface of the first base is bonded to the back surface of the second base. The back surfaces of the bases may be bonded by sonic welding.Type: GrantFiled: June 25, 1997Date of Patent: July 6, 1999Assignee: Diamond Machining Technology, Inc.Inventors: David G. Powell, Stanley A. Watson
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Patent number: 5328460Abstract: Apparatus located in an implantable medication infusion pump for quickly and easily detecting a condition adversely affecting medication delivery in the implantable medication infusion pump is disclosed which can reliably detect occurrences including an occluded catheter, the presence of air in the pumping mechanism, and the failure of the pumping mechanism. The system uses the amplitude of an acoustic signal generated by operation of the pumping mechanism as compared with a baseline signal to detect an encapsulated or occluded catheter or air in the fluid line. In addition, the system can detect a partially encapsulated or occluded catheter by detecting repeated downward slope patterns during repetitive, closely spaced pumping cycles.Type: GrantFiled: June 11, 1993Date of Patent: July 12, 1994Assignee: Pacesetter Infusion, Ltd.Inventors: Peter C. Lord, John R. Schultz, David G. Powell
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Patent number: 4204513Abstract: Three embodiments of a hydraulic safety mechanism are adapted to adjust the speed setting for an engine upon a reduction of pressure in a chamber, due for example, to loss of lubricating pressure, overspeeding of the engine or overheating, for example. In each embodiment, a speed control element for the engine is maintained in a normal operating position by a piston and cylinder combination which hydraulically blocks the chamber from the fluid drain in a normal operating position, the piston responding to reduced pressure in the chamber by communicating the chamber with the drain the piston thereby being hydraulically unlatched and permitting the speed control element to be repositioned to a reduced speed setting. A restrictive orifice, preferably of variable size and self-cleaning construction, regulates communication between the hydraulic circuit and the chamber. In another embodiment the safety mechanism includes a solenoid and accumulator chamber to adapt it for remote operation.Type: GrantFiled: November 15, 1978Date of Patent: May 27, 1980Assignee: California Controls CompanyInventors: Robert A. Bilbrey, William O. Munroe, David G. Powell
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Patent number: D372180Type: GrantFiled: January 17, 1995Date of Patent: July 30, 1996Inventor: David G. Powell