Patents by Inventor Philippos Pantelis

Philippos Pantelis 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).

  • Wavelength-selective optical device utilizing a selectively variable surface acoustic wave grating in a polar organic material
    Patent number: 5448665
    Abstract: A wavelength-selective arrangement interacts with optical radiation propagating in a transmission medium. The arrangement includes a selector member made of a polar organic material which exhibits piezoelectric properties, the selector member having an interaction surface for interacting with the radiation. The selector member is provided with structure for propagating surface acoustic waves along the interaction surface so as to create a grating and thereby determine its interacting properties in relation to the wavelength of the radiation, in a selectively variable manner.
    Type: Grant
    Filed: July 11, 1994
    Date of Patent: September 5, 1995
    Assignee: British Telecommunications public limited company
    Inventors: Stephen V. Kershaw, Stephen A. Cassidy, Philippos Pantelis, Richard A. Pethrick, Sandra Gilmour
  • Compositions having non-linear optical properties
    Patent number: 4748074
    Abstract: Non linear optical compositions contain a vinylidene fluoride copolymer and an additive having molecular optoelelectronic activity, e.g. methyl-N-(2,4-dinitrophenyl)-alaninate. Poled films derived from the composite display optoelectronic activity. There is a marked contrast with known techniques in which single crystals are utilized. The compositions are used to make laminates which display good waveguide properties.
    Type: Grant
    Filed: December 16, 1985
    Date of Patent: May 31, 1988
    Assignee: British Telecommunications Public Limited Company
    Inventors: Philippos Pantelis, Graham J. Davies
  • Optical waveguides containing compositions having non-linear optical properties
    Patent number: 4746577
    Abstract: Non linear optical compositions contain a vinylidene fluoride copolymer and an additive having molecular optoelectronic activity, e.g. methyl-N-(2,4-dinitrophenyl)-alaninate. Poled films derived from the composite display optoelectronic activity. There is a marked contrast with known techniques in which single crystals are utilized. The compositions are used to make laminates which display good waveguide properties.
    Type: Grant
    Filed: February 24, 1987
    Date of Patent: May 24, 1988
    Assignee: British Telecommunications Public Limited Company
    Inventors: Philippos Pantelis, Graham J. Davies
  • Piezoelectric and pyroelectric film
    Patent number: 4557880
    Abstract: Film with piezoelectric and pyroelectric properties is obtained by extruding PVDF, stretching the extrudate and applying a corona discharge, preferably at the place where stretching occurs. The PVDF may be homopolymer, but copolymers of at least 50 mole % of vinylidene fluoride with tetrafluoroethylene and/or trifluoroethylene may be used.
    Type: Grant
    Filed: March 14, 1983
    Date of Patent: December 10, 1985
    Assignee: British Telecommunications
    Inventor: Philippos Pantelis
  • Method for producing piezoelectric polymeric material
    Patent number: 4239608
    Abstract: A method of enhancing the piezoelectric properties of a polymeric material exhibiting such properties includes the step of exposing the material to a quantity of .gamma. radiation lying within the range of from 1 Mrad to 200 Mrads. The material is subsequently poled. Best results are obtained when the material is exposed to between 1 Mrad and 100 Mrads of radiation. The material treated may be polyvinylidene fluoride.
    Type: Grant
    Filed: July 19, 1978
    Date of Patent: December 16, 1980
    Assignee: Post Office
    Inventor: Philippos Pantelis