Patents by Inventor Rene De Keyzer
Rene De Keyzer 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: 7278728Abstract: An ink-jet printing system including at least one ink-jet ink and a means for jetting an ink-jet ink onto a surface of a substantially non-absorbing ink-jet ink-receiver, characterized in that the ratio ? Sd/? Ld of the dispersive surface energy of said ink-receiver surface ? Sd over the dispersive surface energy of said ink-jet ink ? Ld is greater than 0.9. A process for ink-jet printing is also claimed. High areal throughput ink-jet printing (e.g. >100 m2/hour) with curable inks can be performed on different kinds of ink-receiver surfaces with a good image quality and colour density due to a controlled spreading of the ink-drops which can be directly cured.Type: GrantFiled: January 24, 2005Date of Patent: October 9, 2007Assignee: Agfa Graphics NVInventors: Guido Desie, Dirk Quintens, Bavo Muys, Patrick Mertens, Rene De Keyzer, Roland Claes
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Publication number: 20050190245Abstract: An ink-jet printing system comprising at least one ink-jet ink and a means for jetting an ink-jet ink onto a surface of a substantially non-absorbing ink-jet ink-receiver, characterized in that the ratio ? Sd/? Ld of the dispersive surface energy of said ink-receiver surface a ? Sd over the dispersive surface energy of said ink-jet ink a ? Ld is greater than 0.9. A process for ink-jet printing is also claimed. High areal throughput ink-jet printing (e.g. >100 m2/hour) with curable inks can be performed on different kinds of ink-receiver surfaces with a good image quality and colour density due to a controlled spreading of the ink-drops which can be directly cured.Type: ApplicationFiled: January 24, 2005Publication date: September 1, 2005Applicant: AGFA-GEVAERTInventors: Guido Desie, Dirk Quintens, Bavo Muys, Patrick Mertens, Rene De Keyzer, Roland Claes
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Patent number: 6686313Abstract: A monosheet black and white substantially light-insensitive thermographic recording material comprising a thermosensitive element and a support, the thermosensitive element containing a substantially light-insensitive organic silver salt and an organic reducing agent therefor in thermal working relationship therewith and a binder, wherein the thermographic recording material comprises a reaction product of an amino-group containing polymer and a compound according to formula (I): wherein each of R1, R2, R3 and R4 is independently hydrogen or an optionally substituted alkyl, aryl, heteroaryl, alkoxy or aryloxy group; L is a divalent linking group selected from the group consisting of oxygen and optionally substituted alkyl, aryl, heteroaryl, alkenyl and alkynyl groups; and m is either 0 or 1; and n is either 0 or 1; and a preparation process therefor.Type: GrantFiled: November 28, 2001Date of Patent: February 3, 2004Assignee: Agfa-GevaertInventors: Carlo Uyttendaele, Rene De Keyzer, Johan Loccufier, Ivan Hoogmartens
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Patent number: 6436625Abstract: A photosensitive element including a silver halide emulsion having silver halide grains containing an organic hole-trapping dopant. In a preferred embodiment the dopant is represented by formula (I): R—COOM (I) wherein R is hydrogen, an alkyl group, an aryl group, an aralkyl group or hetero-aryl group, and M is hydrogen or any metal or organic group which can form a salt or by formula (II): wherein: X and Y are independently selected from O, S, Se, m is 1 and n is 1 or 2, R1 and R2 are hydrogen, an alkyl group, an aryl or aralkyl group or a heteroaryl group, wherein R1 and R2 may be the same or different and may form a ring, E represents a group linked to the carbon atom by a heteroatom, having at least one free electron pair, M+ is a proton or an organic or inorganic (metal) counterion. Moreover a photosensitive element is provided where the photosensitive element can be a photoaddressable thermographic element.Type: GrantFiled: May 29, 2001Date of Patent: August 20, 2002Assignee: Agfa-GevaertInventors: René De Keyzer, Mona Treguer, Jacqueline Belloni, Remita Hynd
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Publication number: 20020111270Abstract: A monosheet black and white substantially light-insensitive thermographic recording material comprising a thermosensitive element and a support, the thermosensitive element containing a substantially light-insensitive organic silver salt and an organic reducing agent therefor in thermal working relationship therewith and a binder, wherein the thermographic recording material comprises a reaction product of an amino-group containing polymer and a compound according to formula (I): 1Type: ApplicationFiled: November 28, 2001Publication date: August 15, 2002Applicant: Agfa-GevaertInventors: Carlo Uyttendaele, Rene De Keyzer, Johan Loccufier, Ivan Hoogmartens
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Patent number: 6344311Abstract: A photosensitive element comprising a silver halide emulsion having silver halide grains containing an organic hole-trapping dopant.Type: GrantFiled: September 21, 2000Date of Patent: February 5, 2002Assignee: Agfa-GevaertInventors: René De Keyzer, Mona Treguer, Jacqueline Belloni, Remita Hynd
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Publication number: 20010031435Abstract: A photosensitive element comprising a silver halide emulsion having silver halide grains containing an organic hole-trapping dopant.Type: ApplicationFiled: May 29, 2001Publication date: October 18, 2001Applicant: Agfa-GevaertInventors: Rene De Keyzer, Mona Treguer, Jacqueline Belloni, Hynd Remita
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Patent number: 6277549Abstract: A photosensitive element comprising a silver halide emulsion having silver halide grains containing an organic hole-trapping dopant. In a preferred embodiment said dopant is represented by formula (I): R—COOM (I) wherein R is hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aralkyl group or hetero-aryl group, and M is hydrogen or any metal or organic group which can form a salt or by formula (II): wherein: X and Y are independently selected from O, S, Se, m is 1 and n is 1 or 2, R1 and R2 are hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl or aralkyl group or a substituted or unsubstituted heteroaryl group, wherein R1 and R2 may be the same or different and may form a ring, E represents a group linked to the carbon atom by a heteroatom, having at least one free electron pair, M+ is a proton or an organic or inorganic (metal) counterion.Type: GrantFiled: December 11, 1998Date of Patent: August 21, 2001Assignee: Agfa-GevaertInventors: René De Keyzer, Mona Treguer, Jacqueline Belloni, Remita Hynd
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Patent number: 6063558Abstract: A photosensitive element which comprises on a support at least one photosensitive silver halide emulsion layer and at least a non-light sensitive layer, wherein the silver halide emulsion layer comprises a chalcogenic compound satisfying formula (1): ##STR1## wherein: X represents Se or Te, forming a double bond with its neighbouring C-atom,Nu represents a nucleophilic group which brings an electron pair in heterolytic bond formation; Nu has a pK.sub.a -value of at least 2.0 if Nu is an acidic group,L represents a divalent linking group representing each group which can position an electron donating atom in any of the 5th to the 8th position vis-a-vis the carbon atom of the carbon-chalcogen double bond,AQB represents the necessary atoms to form a heterocyclic 5- or 6-membered ring, provided that when A is a Nitrogen-atom, B is an atom selected from the group consisting of NR.sup.1, O, S, Se and Te,R.sup.Type: GrantFiled: May 25, 1999Date of Patent: May 16, 2000Assignee: Agfa-Gevaert, N.V.Inventors: Johan Loccufier, Rene De Keyzer, Antonius Rutges
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Patent number: 5985536Abstract: A photosensitive element is disclosed comprising on at least one side of a support one or more silver halide emulsion layers and a non-light sensitive hydrophilic colloidal layer characterized in that at least one emulsion layer comprises silver halide crystals having an oligomeric platinum complex containing only carbonyl ligands, which is represented by formula (1):[Pt.sub.3 (CO).sub.6 ].sub.n.sup.2- (1)wherein n is not more than 10.The invention also provides a method for the preparation of a photosensitive element as described hereinbefore comprising the step of introducing the oligomeric platinum carbonyl containing complex as represented by formula (1) during grain formation in at least one silver halide emulsion.Type: GrantFiled: September 23, 1998Date of Patent: November 16, 1999Assignee: Agfa-Gevaert, N. V.Inventors: Rene De Keyzer, Mona Treguer, Jacqueline Belloni-Cofler, Hynd Remita
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Patent number: 5910402Abstract: A photosensitive element which comprises a support, at least one silver halide emulsion layer and at least a non-light sensitive hydrophilic colloidal layer, wherein the silver halide emulsion layer comprises a selenium compound represented by formula (1): ##STR1## wherein: Q represents R.sup.1 SO.sub.2 or R.sup.2 R.sup.3 P=X;each of R.sup.1, R.sup.2 and R.sup.3 the same or different represents OR.sup.4, NR.sup.5 R.sup.6, SR.sup.7, SeR.sup.8 an alkyl group, an aryl group or a heteroaryl group;X represents O, S or Se;each of R.sup.4, R.sup.5, R.sup.6, R.sup.7 and R.sup.8 the same or different represents hydrogen, an alkyl group, an aryl group or a heteroaryl group, or R.sup.5 and R.sup.6 together represents the atoms necessary to form a N-containing ring.The invention also provides a method for the preparation of a photosensitive element as disclosed hereinbefore comprising the step of chemically sensitizing at least one of the silver halide emulsions by means of a selenium compound as defined.Type: GrantFiled: May 26, 1998Date of Patent: June 8, 1999Assignee: AGFA-Gevaert, N.V.Inventors: Rene De Keyzer, Johan Loccufier, Kathy Elst
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Patent number: 5712076Abstract: The present invention provides an imaging element comprising in the order given on a hydrophilic surface of a support (i) an image receiving layer containing physical development nuclei, (ii) a photosensitive layer containing one or more silver halide emulsions being in water permeable relationship with said image receiving layer, characterized in that said one or more silver halide emulsions comprise substantially no silver bromide and that said imaging element comprises on top of said photosensitive layer an antistress layer, being in water permeable relationship with said photosensitive layer and comprising an unhardened gelatin in an amount ranging from 0.60 to 1.75 g/m.sup.2.Type: GrantFiled: October 29, 1996Date of Patent: January 27, 1998Assignee: AGFA-Gevaert, N.V.Inventors: Paul Coppens, Bartholomeus Van Der Linden, Rene De Keyzer
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Patent number: 5707774Abstract: According to the present invention, a method is provided for preparing physical development nuclei for use in silver salt diffusion transfer processing, said physical development nuclei comprising a heavy metal sulphide, said method comprising the steps of:precipitating said heavy metal sulphide by bringing a water soluble heavy metal compound in reactive association with a water soluble sulphide in an aqueous liquid andsaid precipitation being carried out in the presence of a hydrophilic polymer so as to disperse said heavy metal sulphide, said hydrophilic polymer comprising a heterocyclic group, characterized in that said heterocyclic group is present in a recurring unit of said hydrophilic polymer, said recurring unit being comprised in said polymer in an amount between 0.1 mol % and 5 mol %.Type: GrantFiled: September 12, 1996Date of Patent: January 13, 1998Assignee: AGFA-Gevaert, N.V.Inventors: Lode Deprez, Ronny De Clercq, Rene De Keyzer
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Patent number: 5691105Abstract: The present invention provides a method for obtaining an imaging element suitable for use in a silver salt diffusion transfer process comprising the steps of coating a support with a layer comprising physical development nuclei and a photosensitive layer comprising a photosensitive silver halide emulsion, said photosensitive layer being in water permeable relationship with said image receiving layer, characterized in that said physical development nuclei consist of a substantially homogeneous solid solution of two or more different metals and are prepared by pulsed high flux radiolysis.According to the invention there is further provided a method for making a lithographic printing plate comprising the steps of image-wise exposing an imaging element prepared as defined above and subsequently developing a thus obtained image-wise exposed imaging element by means of an alkaline processing solution in the presence of a developing agent and a silver halide solvent.Type: GrantFiled: November 12, 1996Date of Patent: November 25, 1997Assignee: AGFA-Gevaert, N.V.Inventors: Rene De Keyzer, Yves Van Meenen
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Patent number: 5645971Abstract: The present invention provides a method for making a lithographic printing plate according to the silver salt diffusion transfer process comprising the steps of image-wise exposing an imaging element comprising on a support a photosensitive layer comprising a silver halide emulsion and an image receiving layer containing physical development nuclei and developing said imaging element in the presence of developing agent(s) and silver halide solvent(s) using an alkaline processing liquid characterized in that said development is carried out in the presence of a meso-ionic compound. The present invention further provides an imaging element and alkaline processing liquid for use in said method.Type: GrantFiled: June 20, 1996Date of Patent: July 8, 1997Assignee: Agfa-Gevaert, N.V.Inventors: Ludo Van Rompuy, Rene De Keyzer, Jean-Marie Dewanckele, Marcel Monbaliu, Jos Vaes
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Patent number: 5629131Abstract: The present invention provides an image receiving material comprising a receiving layer containing physical development nuclei characterized in that said physical development nuclei are grown on a colloidal smectic clay. Said image receiving material may be provided wih a photosensitive silver halide emulsion layer or may form a separate receiving element.The image receiving materials of the present invention can also be used for making lithographic printing plates having good printing properties.Type: GrantFiled: April 29, 1996Date of Patent: May 13, 1997Assignee: Agfa-Gevaert, N.V.Inventors: Rene De Keyzer, Yves Van Meenen
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Patent number: 5612166Abstract: The present invention provides an imaging element comprising in the order given on a hydrophilic surface of a support (i) an image receiving layer containing physical development nuclei, (ii) a photosensitive layer containing a silver halide emulsion being in water permeable relationship with said image receiving layer and (iii) an intermediate layer between said image receiving layer and said photosensitive layer, characterized in that said intermediate layer comprises particles of an alkali insoluble non-polymeric organic compound having a melting point of at least 50.degree. C, said particles having a number average size between 0.1 .mu.m and 10 .mu.m.According to the present invention there is also provided a method for making an offset printing plate according to the silver salt diffusion transfer process by using said imaging element+.Type: GrantFiled: June 3, 1996Date of Patent: March 18, 1997Assignee: Agfa-Gevaert, N.V.Inventors: Paul Coppens, Rene De Keyzer, Johan Loccufier
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Patent number: 5536618Abstract: The present invention provides a method for making a lithographic printing plate according to the silver salt diffusion transfer process comprising the steps of exposing and developing an imaging element comprising on a support a silver halide emulsion layer and an image-receiving layer in the presence of a silver halide solvents corresponding to the following formula:Z.sup.1 --(R.sup.1 --X.sup.1).sub.n --(R.sup.2 --X.sup.2)--L--(X.sup.3 --R.sup.3)--(X.sup.4 --R.sup.4).sub.m --Z.sup.2 (I)wherein X.sup.1, X.sup.2, X.sup.3 and X.sup.4 each independently represents --S--, --NH-- or --N(R.sup.5 --Z.sup.3)--, R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 each independently represents an alkylene, an alkenylene or an alkynylene, n and m each independently represents an integer from 0 to 4, Z.sup.1, Z.sup.2 and Z.sup.Type: GrantFiled: February 27, 1995Date of Patent: July 16, 1996Assignee: AGFA-Gevaert, N.V.Inventors: Rene De Keyzer, Paul Callant, Jean-Marie Dewanckele, Marcel Monbaliu
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Patent number: 5340705Abstract: An aqueous alkaline processing liquid for use in silver halide photography, wherein said liquid comprises one or more alkanolamines, the said alkanolamines consisting of one or more tertiary alkanolamines in a total amount in the range from 0.3 mol/l to 1.5 mol/l, and one or more secondary alkanolamines in an amount from 0 mol % to 30 mol % with respect to the amount of tertiary alkanolamine(s), and said liquid also contains sulphite ions in an amount in the range of 16 g/l to 30 g/l.Type: GrantFiled: March 2, 1993Date of Patent: August 23, 1994Assignee: AGFA-Gevaert, N.V.Inventors: Rene De Keyzer, Raymond L. Odeurs, Luc A. De Brabandere
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Patent number: 5283156Abstract: The present invention provides a method for making a lithographic printing plate according to the silver salt diffusion transfer process comprising the steps of image-wise exposing an imaging element comprising on a support a photosensitive layer comprising a silver halide emulsion and an image receiving layer containing physical development nuclei and developing said imaging element in the presence of developing agent(s) and silver halide solvent(s) using an alkaline processing liquid characterized in that said development is carried out in the presence of a regulator according to one of the formulas as specified in the claims. The present invention further provides an imaging element and alkaline processing liquid for use in said method.Type: GrantFiled: December 4, 1992Date of Patent: February 1, 1994Assignee: Agfa-Gevaert, N.V.Inventors: Marcel Monbaliu, Rene De Keyzer, Jean-Marie Dewanckele, Jos Vaes, Ludo Van Rompuy