Patents by Inventor Rupert Alec Selway

Rupert Alec Selway 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).

  • Lightly cross-linked hydrogel formed from N-vinyl lactam and hydrophobic acrylic ester comonomer
    Patent number: 4036814
    Abstract: A copolymeric hydrogel for contact lenses with physiological saline uptake 65-85% is formed from an N-vinyl lactam e.g. N-vinyl-2-pyrrolidone and up to 15% of a hydrophobic comonomer of formula ##STR1## where R.sup.1 is H or C.sub.1 -C.sub.4 alkyl (preferably methyl) X is --O-- or --NH-- and R.sup.2 is aryl, C.sub.1 -C.sub.6 alkyl substituted by aryl or aryloxy, or C.sub.1 -C.sub.6 alkoxy substituted by aryl or aryloxy. Preferably the aryl or aryloxy group contain one or two six-membered carbocyclic aromatic rings; they may be C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, or halogen, substituted. Crosslinking agents used preferably have their two functional groups differing in reactivity e.g. allyl, or 3-allyloxy-2-hydroxypropyl, methacrylates.
    Type: Grant
    Filed: June 25, 1975
    Date of Patent: July 19, 1977
    Assignee: Warner-Lambert Company
    Inventors: John Gordon Bernard Howes, Nicholas Mario DA Costa, Rupert Alec Selway, William Duncan Potter