Patents by Inventor David J. Thompson

David J. Thompson 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).

  • Patent number: 5536016
    Abstract: A progressive system for a match number game. An ante coin acceptor is located near each played card on each player's station. A progressive coin acceptor is also located on each player station. A player places an ante bet or a progressive bet by placing coins in the ante and progressive coin acceptors. A controller controls the operation of the coin acceptors.The operator of the game causes the ante and progressive controllers connected to all ante and progressive acceptors to drop all sensed coins into a drop bucket, to activate verification light at each acceptor that the coin has been received and to lockout the coin acceptor to prevent future insertion of coins. The game is played by announcing randomly selective numbers from 1 to 30. At the beginning of the game, the first three randomly selected numbers called, if those three match on a given card and if the player has placed a progressive bet, the player wins the progressive jackpot.
    Type: Grant
    Filed: September 26, 1994
    Date of Patent: July 16, 1996
    Assignee: Mikohn Gaming Corporation
    Inventor: David J. Thompson
  • Patent number: 5372389
    Abstract: The nozzle swivel joint includes two couplings which are joined together at mutually flat interface surfaces. Each coupling has an axial flow passage, and the two couplings are held together in mutually rotatable position by a manifold with a threaded end; the manifold having inlet and outlet ports respectively aligned to the flow passages in the couplings. The manifold is sealably affixed to one of the couplings, with a gasket forming a seal about the threadable manifold. An O-ring is compressed between the respective flat interface surfaces to provide a limited friction seal for restricting relative rotation between the couplings, while at the same time permitting rotation to occur with a limited amount of force.
    Type: Grant
    Filed: June 22, 1993
    Date of Patent: December 13, 1994
    Assignee: Graco Inc.
    Inventors: Jimmy W. S. Tam, David J. Thompson
  • Patent number: 5011077
    Abstract: A rail which has secured to it a composite body for absorbing vibrational energy whereby to reduce noise generated by vehicular traffic on the rail. The composite body comprises a visco-elastic damping medium 5 bonded to, and sandwiched between, both the rail and a constraining member, e.g. a steel strip 6, substantially stiffer in tension than the damping medium.
    Type: Grant
    Filed: September 18, 1989
    Date of Patent: April 30, 1991
    Assignees: British Steel plc, British Railways Board
    Inventors: William H. Hodgson, Colin G. Stanworth, David J. Thompson
  • Patent number: 4742173
    Abstract: A metal dithiene of the formula: ##STR1## wherein R.sup.1 is C.sub.3 to C.sub.20 alkyl;R.sup.2 is selected from alkyl, alkylamino, dialkylamino, alkylthio and alkoxy in which each alkyl contains up to 20 carbon atoms;R.sup.3 is H, halogen or a group represented by R.sup.2 ; andM is a metal selected from Groups Ib, IIb, VIIb, and VIIIb of the Periodic Table,and a composition of the metal dithiene in a liquid crystal medium. The composition is suitable for use in a light valve for a laser-addressed liquid crystal display.
    Type: Grant
    Filed: September 19, 1986
    Date of Patent: May 3, 1988
    Assignee: Imperial Chemical Industries PLC
    Inventors: Damien G. McDonnell, Paul F. Gordon, Anthony J. Hughes, David J. Thompson
  • Patent number: 4668811
    Abstract: A metal dithiene of the formula: ##STR1## wherein R.sup.1 is C.sub.3 to C.sub.20 alkyl;R.sup.2 is selected from alkyl, alkylamino, dialkylamino, alkylthio and alkoxy in which each alkyl contains up to 20 carbon atoms;R.sup.3 is H, halogen or a group represented by R.sup.2 ;and M is a metal selected from Groups Ib, IIb, VIIb, and VIIIb of the Periodic Table,and a composition of the metal dithiene in a liquid crystal medium. The composition is suitable for use in a light valve for a laser-addressed liquid crystal display.
    Type: Grant
    Filed: July 27, 1984
    Date of Patent: May 26, 1987
    Assignee: Imperial Chemical Industries PLC
    Inventors: Damien G. McDonnell, Paul F. Gordon, Anthony J. Hughes, David J. Thompson
  • Patent number: 4506957
    Abstract: A material suitable for a guest-host liquid crystal device comprises a solution of a liquid crystal material and a pleochroic dye characterized in that the dye comprises at least one anthraquinone compound free from water-solubilizing and ionic substituents and having the formula: ##STR1## wherein each of R and R.sup.1 independently represents an n-alkyl group having from 4 to 7 carbon atoms inclusive and wherein each of R.sup.2 and R.sup.3 is independently selected from hydrogen and alkyl groups having from 1 to 4 carbon atoms inclusive.
    Type: Grant
    Filed: April 6, 1983
    Date of Patent: March 26, 1985
    Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
    Inventors: Kenneth J. Harrison, Edward P. Raynes, Frances C. Saunders, David J. Thompson, David F. Newton
  • Patent number: 4496221
    Abstract: A material suitable for a guest-host liquid crystal device comprises a soion of a liquid crystal material and a pleochroic dye where in the pleochroic dye comprises at least one anthrquinone compound free from water solubilizing and ionic substituents and having the formula: ##STR1## wherein Q is NH.sub.2, OH, alkyl, aryl, NO.sub.2 or halo;n is 0 to 4;each X independently is H, --SR, --NZ.sub.1 Z.sub.2 or Q;each R independently is alkyl, aryl or cycloalkyl;Z.sub.1 and Z.sub.2 are independently H, alkyl, cycloalkyl or aryl; provided that there are at least two groups X which are different --SR groups.
    Type: Grant
    Filed: February 24, 1982
    Date of Patent: January 29, 1985
    Assignee: Secretary of State for Defence in Her Britanic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland of Whitehall
    Inventors: Kenneth J. Harrison, Edward P. Raynes, Frances C. Saunders, David J. Thompson
  • Patent number: 4493785
    Abstract: New pleochroic anthraquinones, suitable for use in colored liquid crystal displays based upon the guest-host effect, of the formula: ##STR1## wherein R & R.sup.1, each independently, represents C.sub.4-7 -n-alkyl; andR.sup.2 & R.sup.3, each independently, represents H or C.sub.1-4 -alkyl.The invention also concerns processes for the preparation of the pleochroic compounds and some intermediate compounds.
    Type: Grant
    Filed: April 6, 1983
    Date of Patent: January 15, 1985
    Assignee: Imperial Chemical Industries PLC
    Inventors: David F. Newton, David J. Thompson
  • Patent number: 4483594
    Abstract: A material suitable for a guest-host liquid crystal device comprises a solution of a liquid crystal material and a pleochroic dye wherein the pleochroic dye comprises at least one compound having a formula: ##STR1## wherein one of X and Y is OH and the other is NHR wherein R is H or lower alkyl; each of R.sub.1 and R.sub.2 independently represents alkyl, aryl, aralkyl, alkoxy or --NR.sub.3 R.sub.4 wherein each of R.sub.3 and R.sub.4 is independently H or lower alkyl, provided that R.sub.2 is always adjacent to an OH group.
    Type: Grant
    Filed: April 13, 1983
    Date of Patent: November 20, 1984
    Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
    Inventors: Kenneth J. Harrison, Edward P. Raynes, Frances C. Saunders, David J. Thompson
  • Patent number: 4464282
    Abstract: A material suitable for a guest-host liquid crystal device comprises a solution of a liquid crystal material and a pleochroic dye wherein the pleochroic dye comprises at least one anthraquinone compound free from water solubilizing and ionic substituents and having the formula: ##STR1## wherein P is OH or NH.sub.2 ; each group X.sup.A is independently selected from OH, NO.sub.2, SR and NZ.sub.1 Z.sub.2 provided that one group X.sup.A is SR and the other group X.sup.A is OH, NO.sub.2 or NZ.sub.1 Z.sub.2 is 1 or 2; each group Q.sub.1 is independently alkyl having from 1 to 20 carbon atoms; each group R is independently selected from alkyl having from 1 to 20 carbon atoms, aryl having up to 15 carbon atoms and cycloalkyl having from 4 to 8 carbon atoms.
    Type: Grant
    Filed: August 24, 1982
    Date of Patent: August 7, 1984
    Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britian and Northern Ireland
    Inventors: Kenneth J. Harrison, Edward P. Raynes, Frances C. Saunders, David J. Thompson
  • Patent number: 4455253
    Abstract: An anthraquinone dye free from water-solubilizing and ionic substituents of the general formula: ##STR1## wherein Q is NH.sub.2, OH, alkyl, aryl, NO.sub.2 or halo;n is 0 to 4;each X independently is H, --SR, --NZ.sub.1 Z.sub.2 or Q;each R independently is alkyl, aryl or cycloalkyl;Z.sub.1 and Z.sub.2 are independently H, alkyl, cycloalkyl or aryl;provided that there are at least two different --SR groups and that where only two X's represent --SR groups at least one R is aryl and the two --SR groups are in the 1 & 5 or the 1 & 8 positions.In addition to the normal textile applications the dye is suitable for use in the coloration of liquid crystals for electro-optic displays.
    Type: Grant
    Filed: February 24, 1982
    Date of Patent: June 19, 1984
    Assignee: Imperial Chemical Industries PLC
    Inventor: David J. Thompson
  • Patent number: 4446047
    Abstract: An anthraquinone dye from water-solubilizing and ionic substituents of the general formula: ##STR1## wherein Q is NH.sub.2, OH, alkyl, aryl, NO.sub.2 or halo;n is 0 to 4;each X independently is H, --SR, --NZ.sub.1 Z.sub.2 or Q;each R independently is alkyl, aryl or cycloalkyl;Z.sub.1 & Z.sub.2 are independently H, alkyl, cycloalkyl or aryl;provided that there are at least two different --SR groups and that where only two X's represent --SR groups at least one R is aryl and the two --SR groups are in the 1 & 5 or the 1 & 8 positions.In addition to the normal textile applications the dye is suitable for use in the coloration of liquid crystals for electro-optic displays.
    Type: Grant
    Filed: August 24, 1982
    Date of Patent: May 1, 1984
    Assignee: Imperial Chemical Industries PLC
    Inventor: David J. Thompson
  • Patent number: 4405211
    Abstract: A material suitable for a guest-host liquid crystal device comprises a solution of a liquid crystal material and a pleochroic dye wherein the pleochroic dye comprises at least one compound having a formula: ##STR1## wherein: R represents a group selected from optionally substituted alkyl and optionally substituted monocyclic aryl;Q represents a group selected from halo, OH, --NO.sub.2, alkyl, aryl and --NR.sub.1 R.sub.2, wherein each of R.sub.1 and R.sub.2 independently represents a group selected from H, alkyl and aryl;x represents an integer from 1 to 4; andy represents an integer from 0 to 4;x+y being in the inclusive range 2 to 4;provided that when x+y=2, x=1 and y=1.
    Type: Grant
    Filed: July 27, 1981
    Date of Patent: September 20, 1983
    Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
    Inventors: Kenneth J. Harrison, Edward P. Raynes, Frances C. Saunders, David J. Thompson
  • Patent number: 4391489
    Abstract: A material suitable for a guest-host liquid crystal device comprises a solution of a liquid crystal material and a pleochroic dye wherein the pleochroic dye comprises at least one compound having a formula: ##STR1## wherein one of X and Y is OH and the other is NHR wherein R is H or lower alkyl; each of R.sub.1 and R.sub.2 independently represents alkyl, aryl, aralkyl, alkoxy or --NR.sub.3 R.sub.4 wherein each of R.sub.3 and R.sub.4 is independently H or lower alkyl, provided that R.sub.2 is always adjacent to an OH group.
    Type: Grant
    Filed: July 27, 1981
    Date of Patent: July 5, 1983
    Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
    Inventors: Kenneth J. Harrison, Edward P. Raynes, Frances C. Saunders, David J. Thompson