Patents by Inventor Ronald S. Hamilton

Ronald S. Hamilton 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).

  • Contact lens mould
    Patent number: 5578332
    Abstract: A mould for cast moulding a contact lens includes a first cup member having a male mould surface and a second cup member with a female mould surface. The two cup members form a piston and cylinder and are used in a pressure vessel so as to apply loading pressure to deflect the mould surfaces to maintain the surfaces in contact with a lens being cast. The mould is opened with the mould surface facing upwardly. Hydrating fluid is added to the first cup member and a cover sealed to the top of the first cup member.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: November 26, 1996
    Assignee: British Technology Group Ltd.
    Inventors: Ronald S. Hamilton, William E. Seden
  • Disposable contact lens package
    Patent number: 5573108
    Abstract: A mould for cast moulding a contact lens includes a first cup member having a male mould surface and a second cup member with a female mould surface. The two cup members form a piston and cylinder and are used in a pressure vessel so as to apply loading pressure to deflect the mould surfaces to maintain the surfaces in contact with a lens being cast. The mould is opened with the mould surface facing upwardly. Hydrating fluid is added to the first cup member and a cover sealed to the top of the first cup member.
    Type: Grant
    Filed: April 26, 1994
    Date of Patent: November 12, 1996
    Assignee: British Technology Group Ltd.
    Inventors: Ronald S. Hamilton, William E. Seden
  • Contact lens
    Patent number: 5293186
    Abstract: To improve its gas-permeability, a contact lens, which may be of any normal material, even a gas-impermeable material such as polymethylmethacrylate, is microperforated with 66000 holes distributed in equispaced sectors leaving unperforated the central (optically important) part and the outermost rim of the lens. With a smaller hole size, some one million holes can be accommodated. In a modification, some or all of the holes go only part way through the thickness of the contact lens.
    Type: Grant
    Filed: July 9, 1992
    Date of Patent: March 8, 1994
    Assignee: British Technology Group Ltd.
    Inventors: William E. Seden, Ronald S. Hamilton
  • Method of casting a contact lens
    Patent number: 5143660
    Abstract: A mould for cast moulding a contact lens comprises a first cup member having a male mould surface and a second cup member with a female mould surface. The two cup members form a piston and cylinder and are used in a pressure vessel so as to apply loading pressure to deflect the mould surfaces to maintain the surfaces in contact with a lens being cast. The mould is opened with the mould surface facing upwardly. Hydrating fluid is added to the first cup member and a cover sealed to the top of the first cup member.
    Type: Grant
    Filed: December 3, 1990
    Date of Patent: September 1, 1992
    Assignee: National Research Development Corporation
    Inventors: Ronald S. Hamilton, William E. Seden