Patents by Inventor David A. Purcell

David A. Purcell 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).

  • Publication number: 20230337873
    Abstract: A collapsible wheeled walker with two side frames and two height adjustable upper body supports. Each upper body support includes a height adjustment tube. And each height adjustment tube may be set to a recoupable height by a height memory device coupled to the height adjustment tube for quick an easy height setting. The apparatus may include a seat that is slidably attached to the two side frames and is movable between a front position to facilitate an ample walking space inside the frames and a rear position for a user to sit. It may include an X-folder that facilitates collapsing the walker to a small footprint It may also include two forearm gutters as, part of the upper both supports that give the user an upright walking posture for health benefits.
    Type: Application
    Filed: April 22, 2022
    Publication date: October 26, 2023
    Inventors: David A Purcell, Yichuan Pan
  • Patent number: 10828226
    Abstract: A collapsible upright wheeled walker with adjustable armrests that support sufficient user upper-body weight to facilitate a natural upright gait and provide unassisted mobility for a wide range of mobility-impaired individuals. The apparatus may be easily and quickly folded (and unfolded) and may include bilateral stabilizing wheel suspensions to facilitate navigation over uneven terrain. The apparatus includes a frame-stiffening folder assembly and may also include mechanical brakes, an adjustable upper armrest assembly with removable padded forearm supports and two pairs of handles, at least one of which is disposed sufficiently forward to place the user within the polygonal footprint defined by the front and rear wheels to provide support without leaning, stooping, or risking falls.
    Type: Grant
    Filed: March 10, 2020
    Date of Patent: November 10, 2020
    Assignee: Protostar, Inc., a Delaware Corporation
    Inventors: Peter James Fellingham, Yichuan Pan, David A Purcell, Nebojsa Sataric
  • Publication number: 20200206068
    Abstract: A collapsible upright wheeled walker with adjustable armrests that support sufficient user upper-body weight to facilitate a natural upright gait and provide unassisted mobility for a wide range of mobility-impaired individuals. The apparatus may be easily and quickly folded (and unfolded) and may include bilateral stabilizing wheel suspensions to facilitate navigation over uneven terrain. The apparatus includes a frame-stiffening folder assembly and may also include mechanical brakes, an adjustable upper armrest assembly with removable padded forearm supports and two pairs of handles, at least one of which is disposed sufficiently forward to place the user within the polygonal footprint defined by the front and rear wheels to provide support without leaning, stooping, or risking falls.
    Type: Application
    Filed: March 10, 2020
    Publication date: July 2, 2020
    Applicant: Protostar, Inc., a Delaware Corporation
    Inventors: Peter James Fellingham, Yichuan Pan, David A. Purcell, Nebojsa Sataric
  • Patent number: 10588815
    Abstract: A collapsible upright wheeled walker with adjustable armrests that support sufficient user upper-body weight to facilitate a natural upright gait and provide unassisted mobility for a wide range of mobility-impaired individuals. The apparatus may be easily and quickly folded (and unfolded) and may include bilateral stabilizing wheel suspensions to facilitate navigation over uneven terrain. The apparatus includes a frame-stiffening folder assembly and may also include mechanical brakes, an adjustable upper armrest assembly with removable padded forearm supports and two pairs of handles, at least one of which is disposed sufficiently forward to place the user within the polygonal footprint defined by the front and rear wheels to provide support without leaning, stooping, or risking falls.
    Type: Grant
    Filed: April 29, 2019
    Date of Patent: March 17, 2020
    Assignee: Protostar, Inc.
    Inventors: Peter James Fellingham, Yichuan Pan, David A Purcell, Nebojsa Sataric
  • Publication number: 20190254918
    Abstract: A collapsible upright wheeled walker with adjustable armrests that support sufficient user upper-body weight to facilitate a natural upright gait and provide unassisted mobility for a wide range of mobility-impaired individuals. The apparatus may be easily and quickly folded (and unfolded) and may include bilateral stabilizing wheel suspensions to facilitate navigation over uneven terrain. The apparatus includes a frame-stiffening folder assembly and may also include mechanical brakes, an adjustable upper armrest assembly with removable padded forearm supports and two pairs of handles, at least one of which is disposed sufficiently forward to place the user within the polygonal footprint defined by the front and rear wheels to provide support without leaning, stooping, or risking falls.
    Type: Application
    Filed: April 29, 2019
    Publication date: August 22, 2019
    Applicant: Protostar, Inc., a Delaware Corporation
    Inventors: Peter James Fellingham, Yichuan Pan, David A. Purcell, Nebojsa Sataric
  • Patent number: 10322056
    Abstract: A collapsible upright wheeled walker with adjustable armrests that support sufficient user upper-body weight to facilitate a natural upright gait and provide unassisted mobility for a wide range of mobility-impaired individuals. The apparatus may be easily and quickly folded (and unfolded) and may include bilateral stabilizing wheel suspensions to facilitate navigation over uneven terrain. The apparatus includes a frame-stiffening folder assembly and may also include mechanical brakes, an adjustable upper armrest assembly with removable padded forearm supports and two pairs of handles, at least one of which is disposed sufficiently forward to place the user within the polygonal footprint defined by the front and rear wheels to provide support without leaning, stooping, or risking falls.
    Type: Grant
    Filed: August 28, 2018
    Date of Patent: June 18, 2019
    Assignee: Protostar, Inc., a Delaware Corporation
    Inventors: Peter James Fellingham, Yichuan Pan, David A Purcell, Nebojsa Sataric
  • Publication number: 20180360686
    Abstract: A collapsible upright wheeled walker with adjustable armrests that support sufficient user upper-body weight to facilitate a natural upright gait and provide unassisted mobility for a wide range of mobility-impaired individuals. The apparatus may be easily and quickly folded (and unfolded) and may include bilateral stabilizing wheel suspensions to facilitate navigation over uneven terrain. The apparatus includes a frame-stiffening folder assembly and may also include mechanical brakes, an adjustable upper armrest assembly with removable padded forearm supports and two pairs of handles, at least one of which is disposed sufficiently forward to place the user within the polygonal footprint defined by the front and rear wheels to provide support without leaning, stooping, or risking falls.
    Type: Application
    Filed: August 28, 2018
    Publication date: December 20, 2018
    Applicant: Protostar, Inc., a Delaware Corporation
    Inventors: Peter James Fellingham, Yichuan Pan, David A Purcell, Nebojsa Sataric
  • Publication number: 20180280226
    Abstract: A collapsible upright wheeled walker with adjustable armrests that support sufficient user upper-body weight to facilitate a natural upright gait and provide unassisted mobility for a wide range of mobility-impaired individuals. The apparatus may be easily and quickly folded (and unfolded) and may include bilateral stabilizing wheel suspensions to facilitate navigation over uneven terrain. The apparatus includes a frame-stiffening folder assembly and may also include mechanical brakes, an adjustable upper armrest assembly with removable padded forearm supports and two pairs of handles, at least one of which is disposed sufficiently forward to place the user within the polygonal footprint defined by the front and rear wheels to provide support without leaning, stooping, or risking falls.
    Type: Application
    Filed: January 25, 2017
    Publication date: October 4, 2018
    Applicant: Protostar, Inc., a Delaware Corporation
    Inventors: Peter James Fellingham, Yichuan Pan, David A Purcell, Nebojsa Sataric
  • Patent number: 10085909
    Abstract: A collapsible upright wheeled walker with adjustable armrests that support sufficient user upper-body weight to facilitate a natural upright gait and provide unassisted mobility for a wide range of mobility-impaired individuals. The apparatus may be easily and quickly folded (and unfolded) and may include bilateral stabilizing wheel suspensions to facilitate navigation over uneven terrain. The apparatus includes a frame-stiffening folder assembly and may also include mechanical brakes, an adjustable upper armrest assembly with removable padded forearm supports and two pairs of handles, at least one of which is disposed sufficiently forward to place the user within the polygonal footprint defined by the front and rear wheels to provide support without leaning, stooping, or risking falls.
    Type: Grant
    Filed: January 25, 2017
    Date of Patent: October 2, 2018
    Assignee: Protostar, Inc., a Delaware Corporation
    Inventors: Peter James Fellingham, Yichuan Pan, David A Purcell, Nebojsa Sataric
  • Publication number: 20170319424
    Abstract: A collapsible upright wheeled walker with adjustable armrests that support sufficient user upper-body weight to facilitate a natural upright gait and provide unassisted mobility for a wide range of mobility-impaired individuals. The apparatus may be easily and quickly folded (and unfolded) and may include bilateral stabilizing wheel suspensions to facilitate navigation over uneven terrain. The apparatus includes a frame-stiffening folder assembly and may also include mechanical brakes, an adjustable upper armrest assembly with removable padded forearm supports and two pairs of handles, at least one of which is disposed sufficiently forward to place the user within the polygonal footprint defined by the front and rear wheels to provide support without leaning, stooping, or risking falls.
    Type: Application
    Filed: January 25, 2017
    Publication date: November 9, 2017
    Applicant: Protostar, Inc., a Delaware Corporation
    Inventors: Peter James Fellingham, Yichuan Pan, David A Purcell, Nebojsa Sataric
  • Publication number: 20170258664
    Abstract: An upright wheeled walker with bilateral stabilizing wheel suspensions, and an automatic braking system integrated with obstacle avoidance systems, terrain sensors and user feedback controls. The walker provides user upper body weight support in a wheeled walker with a user safety system including a plurality of sensor, processor and control elements and an automatic braking system for avoiding unseen obstacles and automatic speed limiting on inclines.
    Type: Application
    Filed: January 26, 2017
    Publication date: September 14, 2017
    Applicant: Protostar, Inc., a Delaware Corporation
    Inventor: David A. Purcell
  • Patent number: 9585807
    Abstract: A collapsible upright wheeled walker with adjustable armrests that support sufficient user upper-body weight to facilitate a natural upright gait and provide unassisted mobility for a wide range of mobility-impaired individuals. The apparatus may be easily and quickly folded (and unfolded) and may include bilateral stabilizing wheel suspensions to facilitate navigation over uneven terrain. The apparatus includes a frame-stiffening folder assembly and may also include mechanical brakes, an adjustable upper armrest assembly with removable padded forearm supports and two pairs of handles, at least one of which is disposed sufficiently forward to place the user within the polygonal footprint defined by the front and rear wheels to provide support without leaning, stooping, or risking falls.
    Type: Grant
    Filed: May 6, 2016
    Date of Patent: March 7, 2017
    Assignee: Protostar, Inc., a Delaware Corporation
    Inventors: Peter James Fellingham, Yichuan Pan, David A Purcell, Nebojsa Sataric
  • Publication number: 20160331626
    Abstract: A collapsible upright wheeled walker with adjustable armrests that support sufficient user upper-body weight to facilitate a natural upright gait and provide unassisted mobility for a wide range of mobility-impaired individuals. The apparatus may be easily and quickly folded (and unfolded) and may include bilateral stabilizing wheel suspensions to facilitate navigation over uneven terrain. The apparatus includes a frame-stiffening folder assembly and may also include mechanical brakes, an adjustable upper armrest assembly with removable padded forearm supports and two pairs of handles, at least one of which is disposed sufficiently forward to place the user within the polygonal footprint defined by the front and rear wheels to provide support without leaning, stooping, or risking falls.
    Type: Application
    Filed: May 6, 2016
    Publication date: November 17, 2016
    Applicant: Protostar, Inc., a Delaware Corporation
    Inventors: Peter James Fellingham, Yichuan Pan, David A. Purcell, Nebojsa Sataric
  • Patent number: 6565197
    Abstract: An ink jet printer having an inking system that includes an ink jet cartridge, a large ink reservoir mounted inside the housing of the ink jet printer at a location which is remote from the ink jet cartridge and tubing connecting the ink reservoir to the ink jet cartridge. The large ink reservoirs may be pancake shaped, and may be stacked in side by side horizontal manner within the housing. A portion of the reservoir is transparent, and is visible to the operator for operator monitoring of ink level through openings in the printer housing placed in juxtaposition with the transparent portion of the large ink reservoirs.
    Type: Grant
    Filed: November 10, 1997
    Date of Patent: May 20, 2003
    Assignee: Encad, Inc.
    Inventors: Richard A. Murray, William M. Fries, David A. Purcell
  • Patent number: 6375298
    Abstract: An ink jet printer with intelligent components includes an ink jet cartridge and a roll of print media, each of which incorporate memory elements. Environmental sensors such as temperature and humidity sensors may also be provided. Data from the memory elements and environmental sensors is used to optimize printer operations, and to provide additional information to printer operators.
    Type: Grant
    Filed: February 23, 2001
    Date of Patent: April 23, 2002
    Assignee: Encad, Inc.
    Inventors: David A. Purcell, Richard A. Murray, Dan J. Dull
  • Patent number: 6347857
    Abstract: A droplet deposition analysis system for an ink jet printer including a flexible transparent substrate. The printer may include a light source on one side of the substrate, and an optical detector on the other side of the substrate.
    Type: Grant
    Filed: September 23, 1999
    Date of Patent: February 19, 2002
    Assignee: Encad, Inc.
    Inventors: David A. Purcell, David A. Neese, Warren Free
  • Publication number: 20010007458
    Abstract: An ink jet printer with intelligent components includes an ink jet cartridge and a roll of print media, each of which incorporate memory elements. Environmental sensors such as temperature and humidity sensors may also be provided. Data from the memory elements and environmental sensors is used to optimize printer operations, and to provide additional information to printer operators.
    Type: Application
    Filed: February 23, 2001
    Publication date: July 12, 2001
    Inventors: David A. Purcell, Richard A. Murray, Dan J. Dull
  • Patent number: 6227643
    Abstract: An ink jet printer with intelligent components includes an ink jet cartridge and a roll of print media, each of which incorporate memory elements. Environmental sensors such as temperature and humidity sensors may also be provided. Data from the memory elements and environmental sensors is used to optimize printer operations, and to provide additional information to printer operators.
    Type: Grant
    Filed: February 25, 1998
    Date of Patent: May 8, 2001
    Assignee: ENCAD, Inc.
    Inventors: David A. Purcell, Richard A. Murray, Dan J. Dull
  • Patent number: 5686947
    Abstract: An ink jet printer having an inking system that includes an ink jet cartridge, a large ink reservoir mounted inside the housing of the ink jet printer at a location which is remote from the ink jet cartridge and tubing connecting the ink reservoir to the ink jet cartridge. The large ink reservoirs may be pancake shaped, and may be stacked in side by side horizontal manner within the housing. A portion of the reservoir is transparent, and is visible to the operator for operator monitoring of ink level through openings in the printer housing placed in juxtaposition with the transparent portion of the large ink reservoirs.
    Type: Grant
    Filed: May 3, 1995
    Date of Patent: November 11, 1997
    Assignee: ENCAD, Inc.
    Inventors: Richard A. Murray, William M. Fries, David A. Purcell