Patents by Inventor David G. Symonds

David G. Symonds 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).

  • Apparatus for feeding a moving web to a stenter apparatus
    Patent number: 4210987
    Abstract: A process and apparatus for introducing a moving web to a stenter apparatus at the commencement of the stenter apparatus operation comprises gripping and transporting the web between at least two belt conveyors which are driven at a linear speed substantially equal to the linear speed of the edge grips of the stenter apparatus, transferring the moving web into the moving edge grips of the stenter apparatus, and disengaging the belt conveyors from gripping and transporting contact with the moving web when continuous web transportation through the stenter apparatus has been established. Useful in processes for the production of oriented and heat-set thermoplastics films such as polyethylene terephthalate films for feeding the film to the stenter apparatus at the beginning of the film production process or if a malfunction necessitating re-feeding occurs in the stenter apparatus. Preferably incorporates means for feeding the film to a dump until re-feeding can occur, then severing the film and re-feeding.
    Type: Grant
    Filed: March 10, 1978
    Date of Patent: July 8, 1980
    Assignee: Imperial Chemical Industries Limited
    Inventors: Nigel C. Benson, John M. F. Hughes, Denis Kingslake, David G. Symonds
  • Process for feeding a moving web to a stenter apparatus
    Patent number: 4173611
    Abstract: A process and apparatus for introducing a moving web to a stenter apparatus at the commencement of the stenter apparatus operation comprises gripping and transporting the web between at least two belt conveyors which are driven at a linear speed substantially equal to the linear speed of the edge grips of the stenter apparatus, transferring the moving web into the moving edge grips of the stenter apparatus, and disengaging the belt conveyors from gripping and transporting contact with the moving web when continuous web transportation through the stenter apparatus has been established. Useful in processes for the production of oriented and heat-set thermoplastics films such as polyethylene terephthalate films for feeding the film to the stenter apparatus at the beginning of the film production process or if a malfunction necessitating re-feeding occurs in the stenter apparatus. Preferably incorporates means for feeding the film to a dump until re-feeding can occur, then severing the film and re-feeding.
    Type: Grant
    Filed: July 15, 1977
    Date of Patent: November 6, 1979
    Assignee: Imperial Chemical Industries Limited
    Inventors: Nigel C. Benson, John M. F. Hughes, Denis Kingslake, David G. Symonds