Patents by Inventor David N. Jones

David N. Jones 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).

  • Steroid intermediates
    Patent number: 4882439
    Abstract: Total synthesis of steroids with substitution in the 2,3, 6, 11 or 17 positions comprising the step of cyclization of a compound having the formula ##STR1## or analogues thereof, where X represents .dbd.O, ##STR2## or .beta.-substituted ##STR3## Y represents .dbd.O, .beta.-oriented ##STR4## or .beta.-orientated OH, R' and R.sup.2 may be the same or different and R' represents alkyl or aryl and R.sup.
    Type: Grant
    Filed: September 19, 1986
    Date of Patent: November 21, 1989
    Assignee: The University of Sheffield
    Inventor: David N. Jones
  • Process for plasticization and pumping of low bulk density plastics
    Patent number: 4461734
    Abstract: Process for the plasticization and pumping of low bulk density synthetic thermoplastic materials through extrusion die means employing a mixer type extruder, the extrudate from said extruder is passed through a rotary melt pump and the molten material is discharged therefrom through a die member.
    Type: Grant
    Filed: September 13, 1982
    Date of Patent: July 24, 1984
    Assignee: Union Carbide Corporation
    Inventors: David N. Jones, Urho S. Haapala, Leonard S. Scarola
  • Process for forming film from low strain hardening polymers
    Patent number: 4415711
    Abstract: A process is disclosed for forming blown film of a low strain hardening polymer, such as a low pressure polymerized-low density ethylene copolymer, including an improved film bubble expanding technique which permits high production rates to be achieved with good film bubble stability. Advantageously, most of the films produced by the process have a relatively high degree of film clarity.
    Type: Grant
    Filed: July 2, 1982
    Date of Patent: November 15, 1983
    Assignee: Union Carbide Corporation
    Inventor: David N. Jones
  • Low-energy extruder-pump system
    Patent number: 4350657
    Abstract: Method and apparatus are disclosed for the low energy melting, extrusion and pumping of material comprising feeding, metering, melting and mixing of such materials in an extruder having a melter screw and subsequently passing the resultant extrudate, through breaker plate and adapter means, to and through a rotary gear pump and, in turn, to a die member.
    Type: Grant
    Filed: November 4, 1980
    Date of Patent: September 21, 1982
    Assignee: Union Carbide Corporation
    Inventors: David N. Jones, Archibald L Burnett, John C. Miller
  • Method and apparatus for cooling film bubble of low strain hardening polymers
    Patent number: 4330501
    Abstract: A process and apparatus are disclosed for forming blown film of a low strain hardening polymer, such as a low pressure polymerized-low density ethylene copolymer, including an improved film bubble cooling technique which permits high production rates to be achieved with good film bubble stability. The disclosed process comprises cooling a molten film bubble by contacting the outside of the film bubble with separate annular streams of cooling fluid fed through at least two stacked annular cooling rings disposed around the film bubble, wherein all or substantially all of the cooling fluid exits the system through a common plane formed by the last cooling ring.
    Type: Grant
    Filed: June 30, 1980
    Date of Patent: May 18, 1982
    Assignee: Union Carbide Corporation
    Inventors: David N. Jones, Stuart J. Kurtz