Patents by Inventor John David Hardstone

John David Hardstone 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).

  • Aminoglycoside antibiotics and intermediates therefor
    Patent number: 4024332
    Abstract: Certain novel derivatives of naturally-occurring aminoglycoside antibiotics such as neamine, kanamycins A and B, 3',4'-dideoxykanamycin B, 3',4'-dideoxy-4,5-dehydrokanamycin B, tobramycin and the gentamicins C.sub.2 and C.sub.1a. The novel derivatives possess an optionally-substituted homo-or heteroarylmethyl group on the nitrogen atom of the aminomethyl moiety at the C-6' position of the natural aminoglycoside and are useful as antibacterial agents.
    Type: Grant
    Filed: June 4, 1974
    Date of Patent: May 17, 1977
    Assignee: Pfizer Inc.
    Inventors: Brian Richard Fenner, John David Hardstone, Michael Ramond Graves Leeming