Patents by Inventor Ping W. Tang
Ping W. Tang 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: 6130032Abstract: A photographic element exhibiting improved yellow dye stability comprises a light sensitive silver halide emulsion layer having associated therewith a yellow dye forming coupler having the formula: wherein:R.sup.1 and R.sup.2 in the formula are independently selected alkyl, aryl, amino or heterocyclic groups, each free of hydrogen bonded to the atom linking the group to the rest of the coupler;R.sup.3 is a H or a substituent;X is C, S, or P, and n is 1 or 2;each Z is an independently selected substituent group substitutable to a phenyl ring provided that at least one such group is an electron withdrawing group and s is 1 to 3;each Y is an independently selected substituent group and r is 1 to 3.Type: GrantFiled: September 26, 1997Date of Patent: October 10, 2000Assignee: Eastman Kodak CompanyInventors: Ping W. Tang, James H. Reynolds, Daniel E. Corcoran
-
Patent number: 5864042Abstract: The invention provides a process for preparing a 4-amino-5-mercapto-3-substituted-?1,2,4!triazole comprising reacting a thiocarbohydrazide with a carboxylic acid in the presence of an organic solvent and a boron compound having the formula ##STR1## where R.sup.2, R.sup.3, and R.sup.4 are independently selected from the group consisting of hydrogen, hydroxy, amino, alkyl, aryl, alkoxy, and aryloxy groups. The process provides a safer low temperature process for preparing the desired compound.Type: GrantFiled: January 21, 1998Date of Patent: January 26, 1999Assignee: Eastman Kodak CompanyInventors: Ping W. Tang, Francesco DeBellis
-
Patent number: 5609996Abstract: A photographic light sensitive silver halide emulsion layer has associated therewith a pyrazoloazole dye-forming coupler having the formula: ##STR1## wherein: R.sup.1 is a substituent bonded to the pyrazolotriazole nucleus by a fully substituted carbon atom;X is hydrogen or a coupling-off group;L is a divalent linking group;R.sup.2, R.sup.3, and R.sup.4 are independently hydrogen or substituent groups; andZ.sub.a, Z.sub.b, and Z.sub.c are independently --C(R')(R")--, .dbd.N--, .dbd.C(R')--, or --NH--, wherein R', and R" are independently H or a substituent, provided that one of either the Z.sub.a --Z.sub.b or the Z.sub.b --Z.sub.c bond is a double bond and the other is a single bond, and provided that when the Z.sub.b --Z.sub.c bond is a double bond, it may form part of a fused ring.Type: GrantFiled: February 29, 1996Date of Patent: March 11, 1997Assignee: Eastman Kodak CompanyInventors: Ping W. Tang, Stanley W. Cowan, David J. Decker, Terrence C. Mungal
-
Patent number: 5576150Abstract: The invention provides a photographic light sensitive silver halide emulsion layer having associated therewith a pyrazolotriazole dye-forming coupler having formula: ##STR1## wherein: R.sub.1 is a substituent bonded to the pyrazolotriazole nucleus by a fully substituted carbon atom;X is hydrogen or a coupling-off group;R.sub.2, R.sub.3, R.sub.4, and R.sub.6 are independently hydrogen or substituent groups;q is from 1 to 3;R.sub.5 and R.sub.7 are independently alkyl, alkoxy, aryl, or aryloxy groups;G is a substituent group and n is from 0 to 3; andY is a substituent group and m is 0 to 4.The invention also provides a coupler compound, a photographic element containing the emulsion layer of the invention, and an imaging process.Type: GrantFiled: February 29, 1996Date of Patent: November 19, 1996Assignee: Eastman Kodak CompanyInventors: Ping W. Tang, Stanley W. Cowan, David J. Decker, Daniel E. Corcoran
-
Patent number: 5457020Abstract: Novel bicyclic pyrazolo couplers containing a ballast group of formula (I): ##STR1## are useful in photographic materials and processes. The couplers exhibit increased coupling activity, and provide formation of dyes having improved maximum magenta image dye density, hue, and dye light stability when employed in color photographic materials and processes.Type: GrantFiled: December 18, 1992Date of Patent: October 10, 1995Assignee: Eastman Kodak CompanyInventors: Philip T. S. Lau, Ping W. Tang, Stanley W. Cowan
-
Patent number: 5441863Abstract: Novel imidazo[3,2-a]imidazole cyan dye-forming couplers and photographic elements containing them are described. The couplers are represented by the following structure: ##STR1## wherein: EWG.sub.1 and EWG.sub.2 each independently represent an electron withdrawing group;X is hydrogen or a coupling-off group; andR.sup.1 is hydrogen or a substituent group.Type: GrantFiled: July 28, 1994Date of Patent: August 15, 1995Assignee: Eastman Kodak CompanyInventors: Ping W. Tang, Thomas H. Jozefiak, David J. Decker
-
Patent number: 5427898Abstract: Novel yellow dye-forming couplers, and photographic elements, emulsions and processes for developing images utilizing the novel couplers, are disclosed. The novel couplers include (a) an acyl acetanilide in which the acyl group has a monocyclic or multicyclic carbon center attached to the carbonyl moiety, and (b) an aryloxy coupling-off group at the coupling position of the acylacetanilide, the coupling-off group having in the ortho position a polarizable substituent.Type: GrantFiled: September 19, 1994Date of Patent: June 27, 1995Assignee: Eastman Kodak CompanyInventors: Ping W. Tang, Philip T. S. Lau, Stanley W. Cowan, Terrence Mungal
-
Patent number: 5424179Abstract: Novel cyclic azole couplers and photographic elements containing them are described. The couplers are represented by the following structure: ##STR1## wherein: COUP is a cyclic azole coupler moiety;R.sub.1, R.sub.2 and R.sub.3 independently represent hydrogen or a substituent;L is a linking group joining the azole ring and the aryleneoxy group;G is a bi-valent linking group; andm is an integer of 0 to 2.Type: GrantFiled: August 11, 1994Date of Patent: June 13, 1995Assignee: Eastman Kodak CompanyInventors: Ping W. Tang, Terrence C. Mungal
-
Patent number: 5360713Abstract: Yellow dye-forming couplers of the acylacetanilide class, having an electron withdrawing group or electronegative element attached to the keto functional group, have excellent light-absorption characteristics and are useful in photographic elements.Type: GrantFiled: November 12, 1992Date of Patent: November 1, 1994Assignee: Eastman Kodak CompanyInventors: Ping W. Tang, Philip T. S. Lau, Stanley W. Cowan
-
Patent number: 5358829Abstract: Novel bicyclic pyrazolo couplers contain a sulfone group of formula (I):--L--NHC(.dbd.O)--(L).sub.n --B--SO.sub.2 --R.sup.1 Iwherein:each L is independently a divalent group linking the adjacent groups;n is 0 or 1;B is a divalent group selected from aryl, aryloxy, aryloxyalkyl, and --C(R.sup.2)(R.sup.3)-- wherein R.sup.2 and R.sup.3 are independently hydrogen or alkyl; andR.sup.1 is a substituted or unsubstituted alkyl having 1 to 22 carbon atomsThese couplers are useful in photographic materials and processes. They exhibit improved color reproduction and dye light stability when employed in color photographic materials and processes.Type: GrantFiled: December 18, 1992Date of Patent: October 25, 1994Assignee: Eastman Kodak CompanyInventors: Ping W. Tang, Stanley W. Cowan
-
Patent number: 5122450Abstract: A biochemical reagent comprises an oligosaccharide, preferably one which has been liberated from an immunogenic glycoprotein or proteoglycan, which is immobilized on a carrier via an intermediate spacer molecule such as a lipid. The lipid molecule should preferably have at least two long lipid tails so that the oligosaccharide is held in spaced relationship to the carrier where is exhibits antibody-binding ability which is almost indistinguishable from that of the original glycoprotein or proteoglycan. The reagent has its application in biochemical testing of oligosaccharides and systems which bind to them.Type: GrantFiled: August 20, 1987Date of Patent: June 16, 1992Assignee: Research Corporation LimitedInventors: Ten Feizi, Ping W. Tang
-
Patent number: 5100772Abstract: A magenta dye-forming coupler for photographic material is disclosed. The coupler is a polymer derived from a monomer having the formula: ##STR1## R.sub.1 represents hydrogen or a substituent, X represents hydrogen or a group capable of being released by a coupling reaction with an oxidized aromatic primary amine developing agent,Z represents the atoms necessary to complete a heterocyclic ring,L represents a divalent linking group,A represents --CONH--, --COO--, --O--, --OOC--, --NHCO--, --NHCONH--, --NHSO.sub.2 --, or a substituted or unsubstituted phenylene group,D represents --O--, --NR"--, or --CONR"--,R represents a substituted or unsubstituted aliphatic or a substituted or unsubstituted aromatic substituent, having at least 6 carbon atoms,R' represents H, substituted or unsubstituted lower alkyl of from 1 to 4 carbon atoms, carboxyl, or halogen, andR" represents substituted or unsubstituted: alkyl, aryl, or acetyl.Type: GrantFiled: December 24, 1990Date of Patent: March 31, 1992Assignee: Eastman Kodak CompanyInventors: Tienteh Chen, Stanley W. Cowan, Edward Schofield, Ping W. Tang
-
Patent number: 4914005Abstract: The reduction of cyan image dye to a leuco compound in a color photographic element by ferrous ion contained in a bleach processing solution is inhibited by the presence in the element of a polymeric latex having recurring units that are derived from certain lower alkoxyacrylate monomers optionally copolymerized with recurring units derived from certain acrylic ionomers.Type: GrantFiled: August 11, 1989Date of Patent: April 3, 1990Assignee: Eastman Kodak CompanyInventors: Philip T. S. Lau, Ping W. Tang, Stanley W. Cowan
-
Photographic materials and process comprising polymeric couplers with alkoxyalkylacrylate comonomers
Patent number: 4612278Abstract: Photographic silver halide materials comprise a polymeric coupler which is at least a copolymer having a repeating unit (A) which comprises at least one coupler moiety (COUP) capable of forming a dye upon coupling with an oxidized color developing agent and at least one repeating unit (B) which is derived from a monomer which is an alkoxyalkylacrylate. The polymeric coupler optionally comprises at least one repeating unit (C) derived from such monomers as those useful for repeating unit (A), those useful for repeating unit (B) and other monomers which can be selected to provide useful physical and chemical properties. The photographic material comprising such a polymeric coupler upon exposure and processing enables formation of a dye image having increased dye density.Type: GrantFiled: July 17, 1985Date of Patent: September 16, 1986Assignee: Eastman Kodak CompanyInventors: Philip Lau, Ping W. Tang