Patents by Inventor Donald Leroy Johnston

Donald Leroy Johnston 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).

  • Vented needle for medical liquids
    Patent number: 4058121
    Abstract: A thermoplastic needle for injecting sterile liquid into a vial with lateral turbulent motion while air from such vial escapes through a special vent groove on the needle. The needle also has spaced stop wings adjacent a rear portion of the vent groove to prevent overinsertion and occlusion of the vent groove.
    Type: Grant
    Filed: June 29, 1976
    Date of Patent: November 15, 1977
    Assignee: American Hospital Supply Corporation
    Inventors: Pradip Vinobchandra Choksi, Donald Leroy Johnston, Walter Seemayer
  • Destructible Luer lock syringe and method of destructing same
    Patent number: 4027669
    Abstract: A destructible hypodermic syringe with a segmented Luer lock sleeve surrounding a scored needle adapter. The individual segments of this sleeve have sufficient lateral stability to lock a needle on the adapter, and at least one segment can flex laterally in an outward direction so the adapter can be broken at its scored line.
    Type: Grant
    Filed: April 12, 1976
    Date of Patent: June 7, 1977
    Assignee: American Hospital Supply Corporation
    Inventors: Donald Leroy Johnston, Manuel Garfield Perkins, Lynn Zaugg Youngberg