Patents by Inventor Donald J. Henderson

Donald J. Henderson 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).

  • Patent number: 5549149
    Abstract: The tambour door assembly (16), for a bathtub (10) having side access or other structures, has a plurality of tambour slats (76 or 401). Shafts (78 or 404) are mounted in the ends of the tambour slats. Rollers 82 are mounted on the shafts (78 or 404) and guided by door guide assemblies 64. A flexible water impervious membrane (86) is clamped to the tambour slats (76 or 401) by clamp plates (414) having a surface (416), that is an arc about an axis parallel to the long axis of the tambour slats, in contact with the membrane. The membrane (86) maintains a predetermined space or pitch between the shafts (78 or 404). Sprockets (92) mesh with the shafts (78 or 404) and transmit force from one tambour slat to another through the membrane (86). If desired a motor can be provided to rotate the sprockets (92) and open and close the tambour door (16).
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: August 27, 1996
    Assignee: Siltech Products Incorporated
    Inventors: Arthur A. Sills, Frederick A. Kilbourn, Brian K. Nelson, Donald J. Henderson
  • Patent number: 5446929
    Abstract: The bath tub (10) having side access has a main tub body (12), a door support, a tambour door assembly (16), a door seal 18 and a control system (20). The door support includes door guide assemblies (64). A tambour door (66) with a plurality of tambour slats (76 or 401) and a flexible impervious membrane (86) is guided by the door guide assemblies (64). The tambour door (66) is in a horizontal position under the floor (27) when it is open and in a vertical position closing the open side (28) of the main tub body (12) when it is closed. A seal (18) seals between the main tub body and the membrane (86). The seal (18) includes a tube (155) that is inflated to seal between the main tub (12) and the tambour door (66). The control system (20) closes the drain 46 when the tambour door (66) is closed and the seal (18) is inflated and the tambour door (66) is constrained in the closed position.
    Type: Grant
    Filed: July 12, 1993
    Date of Patent: September 5, 1995
    Assignee: Siltech Products, Inc.
    Inventors: Arthur A. Sills, Frederick A. Kilbourn, Brian K. Nelson, Donald J. Henderson
  • Patent number: 5351345
    Abstract: The bath tub (10) having side access has a main tub body (12), a door support, a tambour door assembly (16), a door seal 18 and a control system (20). The door support includes door guide assemblies (64). A tambour door (66) with a plurality of tambour slats (76 or 401) and a flexible impervious membrane (86) is guided by the door guide assemblies (64). The tambour door (66) is in a horizontal position under the floor (27) when it is open and in a vertical position closing the open side (28) of the main tub body (12) when it is closed. A seal (18) seals between the main tub body and the membrane (86). The seal (18) includes a tube (155) that is inflated to seal between the main tub (12) and the tambour door (66). The control system (20) closes the drain 46 when the tambour door (66) is closed and the seal (18) is inflated and the tambour door (66) is constrained in the closed position.
    Type: Grant
    Filed: July 8, 1992
    Date of Patent: October 4, 1994
    Assignee: Siltech Products Incorporated
    Inventors: Arthur A. Sills, Frederick A. Kilbourn, Brian K. Nelson, Donald J. Henderson
  • Patent number: 4396342
    Abstract: An actuator is extensible in a first position within a truck receptacle to move a pusher to a primary rearward position in the receptacle; and the actuator is extensible in a second position in the receptacle to move the pusher to a secondary rearward position in the receptacle, said secondary position located closer to a discharge opening than said primary position. Swingable means is provided, and to which the actuator is operatively connected, for swinging that connection to the actuator between the first and second positions.
    Type: Grant
    Filed: September 22, 1980
    Date of Patent: August 2, 1983
    Assignee: Dempster Systems Inc.
    Inventor: Donald J. Henderson
  • Patent number: D355245
    Type: Grant
    Filed: July 27, 1993
    Date of Patent: February 7, 1995
    Assignee: Siltech Products Incorporated
    Inventors: Arthur A. Sills, Frederick A. Kilbourn, Brian K. Nelson, Donald J. Henderson