Patents by Inventor Donald A. McLean

Donald A. McLean 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: 5640952
    Abstract: The personal emergency breathing system includes a canister with a filtration unit for supplying filtered ambient air to a gas mask. The mask includes a fitting from which a regulator and hose coupled to an air tank may be removed after exhaustion of the supply of air and to which the canister is coupled to supply filtered ambient air to the user. Upon removal of the canister from the mask, the canister affords an indication of prior use of the canister and is simultaneously disabled from resecurement to the gas mask.
    Type: Grant
    Filed: September 1, 1995
    Date of Patent: June 24, 1997
    Inventors: Linsey J. Swann, Donald A. McLean
  • Patent number: 5574768
    Abstract: A screen film cassette for radiographic use. The cassette includes front and rear screen-film combinations housed in container, and each screen-film combination includes a pair of intensifying screens which sandwich a film. A dividing filter is located between the two screen-film combinations to improve X-ray beam intensity incident on the back screen-film combination. The filter also reduces the transfer of visible light energy or K-characteristic photon energy, generated in one screen-film combination during the imaging process, to the adjacent screen-film combination. The invention provides for improved radiographic film contrast and image resolution.
    Type: Grant
    Filed: September 8, 1995
    Date of Patent: November 12, 1996
    Assignee: The University of Sydney
    Inventor: Donald McLean
  • Patent number: 5520649
    Abstract: The syringe includes a barrel, a plunger, and an adapter for mounting the needle in the distal end of the barrel. The adapter includes a protrusion projecting away from the needle end and into the barrel defining an annular space between the barrel and the protrusion. The plunger and protrusion have complementary surfaces whereby the plunger may grip the adapter for removal of the adapter into the interior of the barrel after use. These complementary surfaces afford initial resistance to further axial movement of the plunger toward the adapter, signalling the user that further axial pressure will permanently lock the plunger and adapter to one another whereby, upon application of full axial pressure on the plunger, the complementary surfaces of the plunger and adapter permanently lock to one another to enable joint unitary movement of the plunger and adapter together with the needle carried by the adapter into the barrel.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: May 28, 1996
    Assignee: Inviro Medical Devices Ltd.
    Inventors: Laurel A. Novacek, Fraser R. Sharp, Donald A. McLean
  • Patent number: 5462531
    Abstract: The syringe includes a barrel, a plunger, and an adapter for mounting the needle in the distal end of the barrel. The adapter includes a protrusion projecting away from the needle end and into the barrel defining an annular space between the barrel and the protrusion. The plunger and protrusion have complementary surfaces whereby the plunger may grip the adapter for removal of the adapter into the interior of the barrel after use. These complementary surfaces afford initial resistance to further axial movement of the plunger toward the adapter, signalling the user that further axial pressure will permanently lock the plunger and adapter to one another whereby, upon application of full axial pressure on the plunger, the complementary surfaces of the plunger and adapter permanently lock to one another to enable joint unitary movement of the plunger and adapter together with the needle carried by the adapter into the barrel.
    Type: Grant
    Filed: December 21, 1994
    Date of Patent: October 31, 1995
    Assignee: Inviro Medical Devices Ltd.
    Inventors: Laurel A. Novacek, Fraser R. Sharp, Donald A. McLean
  • Patent number: 5415638
    Abstract: The syringe includes a barrel, a plunger, and an adapter for mounting the needle in the distal end of the barrel. The adapter includes a protrusion projecting away from the needle end and into the barrel defining an annular space between the barrel and the protrusion. The plunger and protrusion have complementary surfaces whereby the plunger may grip the adapter for removal of the adapter into the interior of the barrel after use. These complementary surfaces afford initial resistance to further axial movement of the plunger toward the adapter, signalling the user that further axial pressure will permanently lock the plunger and adapter to one another whereby, upon application of full axial pressure on the plunger, the complementary surfaces of the plunger and adapter permanently lock to one another to enable joint unitary movement of the plunger and adapter together with the needle carried by the adapter into the barrel.
    Type: Grant
    Filed: September 30, 1993
    Date of Patent: May 16, 1995
    Assignee: Inviro Medical Devices, Ltd.
    Inventors: Laurel A. Novacek, Fraser R. Sharp, Donald A. McLean
  • Patent number: 5360404
    Abstract: The syringe includes a plunger and an adapter carrying a needle, the adapter being threaded into the end of the barrel for withdrawal, upon connection with the plunger and together with the needle, into the interior of the barrel. To prevent the adapter from unseating from the barrel end before or during use, the needle guard and hub are connected to enable axial pressure from the needle guard to be transmitted through the hub to the adapter to attach the hub to the adapter. Cooperating surfaces on the needle guard and needle hub are engageable to enable a torque to be applied to the adapter only in a direction opposite to the direction of rotation of the adapter during unseating. To the extent rotation of the needle guard in the opposite direction applies a torque to the adapter, that torque is insufficient to unseat the adapter from the barrel end.
    Type: Grant
    Filed: October 15, 1993
    Date of Patent: November 1, 1994
    Assignee: Inviro Medical Devices Ltd.
    Inventors: Laurel A. Novacek, Fraser R. Sharp, Donald A. McLean
  • Patent number: 5263933
    Abstract: The syringe includes a barrel, a plunger, and an adapter for mounting the needle in the distal end of the barrel. The adapter includes a protrusion projecting away from the needle end and into the barrel defining an annular space between the barrel and the protrusion. The plunger and protrusion have complementary surfaces whereby the plunger may grip the adapter for removal of the adapter into the interior of the barrel after use. The adapter includes vent passages communicating between the central passage through the adapter and the annular space whereby air can be vented from the barrel after receiving fluid within the barrel and prior to injection. Thus, the syringe may be oriented in a vertical position needle end uppermost with the vent passages forming the most superior portion of the barrel interior whereby air may be vented.
    Type: Grant
    Filed: July 8, 1992
    Date of Patent: November 23, 1993
    Assignee: Patco Ventures Ltd.
    Inventors: Laurel A. Novacek, Fraser R. Sharp, Donald A. McLean
  • Patent number: 5205827
    Abstract: The syringe includes a barrel, a plunger, and an adapter for mounting the needle in the distal end of the barrel. The adapter includes a protrusion projecting away from the needle end and into the barrel defining an annular space between the barrel and the protrusion. The plunger and protrusion have complementary surfaces whereby the plunger may grip the adapter for removal of the adapter into the interior of the barrel after use. The adapter includes vent passages communicating between the central passage through the adapter and the annular space whereby air can be vented from the barrel after receiving fluid within the barrel and prior to injection. Thus, the syringe may be oriented in a vertical position needle end uppermost with the vent passages forming the most superior portion of the barrel interior whereby air may be vented.
    Type: Grant
    Filed: November 29, 1991
    Date of Patent: April 27, 1993
    Assignee: Patco Ventures Ltd.
    Inventors: Laurel A. Novacek, Fraser R. Sharp, Donald A. McLean
  • Patent number: 5122124
    Abstract: This invention relates to a safety syringe needle device which has medical and industrial application. More particularly, this invention pertains to a syringe which, after being used by a person to inject medication or fluid into a patient, or in sampling or exposure to toxic materials, or the like, can be transformed by the person to withdraw the needle into the barrel of the syringe for disposal purposes, thereby eliminating needle stick injuries among such persons.
    Type: Grant
    Filed: October 3, 1990
    Date of Patent: June 16, 1992
    Assignee: Patco Ventures Ltd.
    Inventors: Laurel A. Novacek, Fraser R. Sharp, Donald A. McLean
  • Patent number: 5112318
    Abstract: The syringe includes a barrel, a plunger, and an adapter for mounting the needle in the distal end of the barrel. The adapter includes a protrusion projecting away from the needle end and into the barrel defining an annular space between the barrel and the protrusion. The plunger and protrusion have complementary surfaces whereby the plunger may grip the adapter for removal of the adapter into the interior of the barrel after use. The adapter includes vent passages communicating between the central passage through the adapter and the annular space whereby air can be vented from the barrel after receiving fluid within the barrel and prior to injection. Thus, the syringe may be oriented in a vertical position needle end uppermost with the vent passages forming the most superior portion of the barrel interior whereby air may be vented.
    Type: Grant
    Filed: April 18, 1991
    Date of Patent: May 12, 1992
    Assignee: Patco Ventures Ltd.
    Inventors: Laurel A. Novacek, Fraser R. Sharp, Donald A. McLean
  • Patent number: 4833807
    Abstract: This invention pertains to a novel waterproof locking wriststrap which is useful for personnel identification and admission control to amusement parks, waterslide parks, and other admission charge crowd related activities. A wriststrap comprising: (a) a strap which has at one end thereof one or more protrusions and at the opposite end one or more grooves, which protrusion and groove are adapted to mate with one another in an interlocking relationship, the end with the groove having therein at least one opening; and (b) a lock which can be moved into place over the protrusion when it mates with the groove, the lock having therein tangs which are adapted to extend into the opening of the strap.
    Type: Grant
    Filed: December 4, 1987
    Date of Patent: May 30, 1989
    Assignee: Panorama Plastics Ltd.
    Inventor: Donald A. McLean
  • Patent number: D270029
    Type: Grant
    Filed: March 23, 1981
    Date of Patent: August 9, 1983
    Assignee: Sun-Rype Products Ltd.
    Inventor: Donald A. McLean