Patents by Inventor Clive R. Day

Clive R. Day 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).

  • Glass fibres and optical communication
    Patent number: 4675038
    Abstract: An improved method of manufacturing an optical fibre by vapor phase deposition of layers of cladding and core material for an optical fibre on the inside of a tubular substrate, followed by heating of the tube to cause it to collapse into a preform and drawing of the preform to form the fibre, includes performing the collapse with the introduction of chlorine gas acting as a drying agent. An alternative to chlorine gas is a vapor which decomposes in situ to yield chlorine without producing a solid deposit.
    Type: Grant
    Filed: April 21, 1986
    Date of Patent: June 23, 1987
    Assignee: British Telecommunications Public Limited Company
    Inventors: Benjamin J. Ainslie, Clive R. Day, Keith J. Beales
  • Optical fibres
    Patent number: 4566754
    Abstract: An optical fibre capable of monomode transmission in, and having a wavelength of zero dispersion in, the 1.55 .mu.m window and having a core comprising silica and germanium dioxide and a cladding comprising silica is drawn from an appropriate preform at a temperature in the range from 1900.degree. C. to 2000.degree. C. Fibres thus produced have low loss compared with fibres drawn at higher temperature.
    Type: Grant
    Filed: March 23, 1982
    Date of Patent: January 28, 1986
    Assignee: British Telecommunications
    Inventors: Keith J. Beales, Clive R. Day, Benjamin J. Ainslie, James D. Rush
  • Method for manufacture of graded index optical fibres
    Patent number: 4351659
    Abstract: A graded index optical fiber is produced in a double crucible with an elongate heated exit nozzle. The core and cladding glasses of the fiber diffuse into one another in the nozzle.
    Type: Grant
    Filed: October 26, 1981
    Date of Patent: September 28, 1982
    Assignee: The Post Office
    Inventors: Keith J. Beales, Clive R. Day, George R. Newns