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).
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Patent number: 5536016Abstract: 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: GrantFiled: September 26, 1994Date of Patent: July 16, 1996Assignee: Mikohn Gaming CorporationInventor: David J. Thompson
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Patent number: 5372389Abstract: 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: GrantFiled: June 22, 1993Date of Patent: December 13, 1994Assignee: Graco Inc.Inventors: Jimmy W. S. Tam, David J. Thompson
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Patent number: 5011077Abstract: 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: GrantFiled: September 18, 1989Date of Patent: April 30, 1991Assignees: British Steel plc, British Railways BoardInventors: William H. Hodgson, Colin G. Stanworth, David J. Thompson
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Patent number: 4742173Abstract: 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: GrantFiled: September 19, 1986Date of Patent: May 3, 1988Assignee: Imperial Chemical Industries PLCInventors: Damien G. McDonnell, Paul F. Gordon, Anthony J. Hughes, David J. Thompson
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Patent number: 4668811Abstract: 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: GrantFiled: July 27, 1984Date of Patent: May 26, 1987Assignee: Imperial Chemical Industries PLCInventors: Damien G. McDonnell, Paul F. Gordon, Anthony J. Hughes, David J. Thompson
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Patent number: 4506957Abstract: 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: GrantFiled: April 6, 1983Date of Patent: March 26, 1985Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern IrelandInventors: Kenneth J. Harrison, Edward P. Raynes, Frances C. Saunders, David J. Thompson, David F. Newton
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Patent number: 4496221Abstract: 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: GrantFiled: February 24, 1982Date of Patent: January 29, 1985Assignee: Secretary of State for Defence in Her Britanic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland of WhitehallInventors: Kenneth J. Harrison, Edward P. Raynes, Frances C. Saunders, David J. Thompson
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Patent number: 4493785Abstract: 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: GrantFiled: April 6, 1983Date of Patent: January 15, 1985Assignee: Imperial Chemical Industries PLCInventors: David F. Newton, David J. Thompson
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Patent number: 4483594Abstract: 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: GrantFiled: April 13, 1983Date of Patent: November 20, 1984Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern IrelandInventors: Kenneth J. Harrison, Edward P. Raynes, Frances C. Saunders, David J. Thompson
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Patent number: 4464282Abstract: 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: GrantFiled: August 24, 1982Date of Patent: August 7, 1984Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britian and Northern IrelandInventors: Kenneth J. Harrison, Edward P. Raynes, Frances C. Saunders, David J. Thompson
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Patent number: 4455253Abstract: 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: GrantFiled: February 24, 1982Date of Patent: June 19, 1984Assignee: Imperial Chemical Industries PLCInventor: David J. Thompson
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Patent number: 4446047Abstract: 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: GrantFiled: August 24, 1982Date of Patent: May 1, 1984Assignee: Imperial Chemical Industries PLCInventor: David J. Thompson
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Patent number: 4405211Abstract: 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: GrantFiled: July 27, 1981Date of Patent: September 20, 1983Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern IrelandInventors: Kenneth J. Harrison, Edward P. Raynes, Frances C. Saunders, David J. Thompson
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Patent number: 4391489Abstract: 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: GrantFiled: July 27, 1981Date of Patent: July 5, 1983Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern IrelandInventors: Kenneth J. Harrison, Edward P. Raynes, Frances C. Saunders, David J. Thompson