Patents by Inventor Rajasekar Vaidyanathan
Rajasekar Vaidyanathan 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: 11767445Abstract: A pre-treatment coating composition includes evaporable liquid vehicle and a pre-treatment coating matrix, including from 30 wt % to 70 wt % multivalent organic salt, from 5 wt % to 30 wt % dispersed polyurethane binder having a weight average molecular weight from 30,000 Mw to 100,000 Mw, from 0.5 wt % to 8 wt % of a high molecular weight polyvinyl alcohol binder, and from 10 wt % to 30 wt % of a low molecular weight polyvinyl alcohol binder. The low molecular weight polyvinyl alcohol binder and the high molecular weight polyvinyl alcohol binder are present in the pre-treatment coating matrix at a 3:1 to 15:1 weight ratio, and weight percentages are based on dry weight of the pre-treatment coating matrix.Type: GrantFiled: September 12, 2019Date of Patent: September 26, 2023Assignee: Hewlett-Packard Development Company, L.P.Inventors: Rajasekar Vaidyanathan, Jason Swei
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Publication number: 20220194109Abstract: A pre-treatment coating composition includes evaporable liquid vehicle and a pre-treatment coating matrix, including from 30 wt % to 70 wt % multivalent organic salt, from 5 wt % to 30 wt % dispersed polyurethane binder having a weight average molecular weight from 30,000 Mw to 100,000 Mw, from 0.5 wt % to 8 wt % of a high molecular weight polyvinyl alcohol binder, and from 10 wt % to 30 wt % of a low molecular weight polyvinyl alcohol binder. The low molecular weight polyvinyl alcohol binder and the high molecular weight polyvinyl alcohol binder are present in the pre-treatment coating matrix at a 3:1 to 15:1 weight ratio, and weight percentages are based on dry weight of the pre-treatment coating matrix.Type: ApplicationFiled: September 12, 2019Publication date: June 23, 2022Applicant: Hewlett-Packard Development Company, L.P.Inventors: Rajasekar Vaidyanathan, Jason Swei
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Publication number: 20220056302Abstract: A pre-treatment coating composition can include an evaporable liquid vehicle and a pre-treatment coating matrix carried by the evaporable liquid vehicle. The pre-treatment coating matrix in this example can include from 30 wt % to 70 wt % multivalent organic salt including a multivalent metal acetate or a multivalent metal propionate, from 5 wt % to 30 wt % dispersed polymeric binder having a weight average molecular weight from 20,000 Mw to 1,000,000 Mw, from 0.5 wt % to 8 wt % of a high molecular weight polyvinyl alcohol binder, and from 10 wt % to 30 wt % of a low molecular weight polyvinyl alcohol binder. The low molecular weight polyvinyl alcohol binder and the high molecular weight polyvinyl alcohol binder in this example can be present in the pre-treatment coating matrix at a 3:1 to 15:1 weight ratio. Weight percentages in this example are based on dry weight of the pre-treatment coating matrix.Type: ApplicationFiled: March 9, 2020Publication date: February 24, 2022Applicant: Hewlett-Packard Development Company, L.P.Inventors: Rajasekar Vaidyanathan, Mark Drake, Jason Swei
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Patent number: 10071585Abstract: The present disclosure provides a print medium, a printed article, and a method of printing. The print medium can include a thin paper substrate having weight ranging from 40 GSM to 150 GSM, and a pre-treatment coating applied to the thin paper substrate at a weight ranging from 0.3 GSM to 15 GSM. The pre-treatment coating can include from 10 wt % to 80 wt % of a fixer, from 3 wt % to 50 wt % of a latex polymer, and from 5 wt % to 50 wt % of a water holding agent.Type: GrantFiled: May 20, 2014Date of Patent: September 11, 2018Assignee: Hewlett-Packard Development Company, L.P.Inventors: Jason Swei, Rajasekar Vaidyanathan, Bor-Jiunn Niu
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Patent number: 9962983Abstract: A printable recording media containing a substrate; a pre-coat layer including more than about 60 wt % of one or more inorganic pigments by total dry weight of the pre-coat layer; a topcoating layer including more than about 60 wt % of one or more inorganic pigments; up to 25 wt % of binders and up to about 5 wt % of a combination of natural and synthetic rheology modifiers, by total weight of the top-coating layer, wherein the ratio of the amount of natural rheology modifiers to the amount of synthetic rheology modifiers is from about 90:10 to about 50:50. Also disclosed herein is a method for making such printable recording media.Type: GrantFiled: March 31, 2014Date of Patent: May 8, 2018Assignee: Hewlett-Packard Development Company, L.P.Inventors: Lokendra Pal, Jason Swei, Rajasekar Vaidyanathan, Silke Courtenay
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Publication number: 20170066270Abstract: A printable recording media containing a substrate; a pre-coat layer including more than about 60 wt % of one or more inorganic pigments by total dry weight of the pre-coat layer; a topcoating layer including more than about 60 wt % of one or more inorganic pigments; up to 25 wt % of binders and up to about 5 wt % of a combination of natural and synthetic rheology modifiers, by total weight of the top-coating layer, wherein the ratio of the amount of natural rheology modifiers to the amount of synthetic rheology modifiers is from about 90:10 to about 50:50. Also disclosed herein is a method for making such printable recording media.Type: ApplicationFiled: March 31, 2014Publication date: March 9, 2017Applicant: Hewlett-Packard Development Company, L.P.Inventors: Lokendra Pal, Jason Swei, Rajasekar Vaidyanathan, Silke Courtenay
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Publication number: 20170036473Abstract: The present disclosure provides a print medium, a printed article, and a method of printing. The print medium can include a thin paper substrate having weight ranging from 40 GSM to 150 GSM, and a pre-treatment coating applied to the thin paper substrate at a weight ranging from 0.3 GSM to 15 GSM. The pre-treatment coating can include from 10 wt % to 80 wt % of a fixer, from 3 wt % to 50 wt % of a latex polymer, and from 5 wt % to 50 wt % of a water holding agent.Type: ApplicationFiled: May 20, 2014Publication date: February 9, 2017Inventors: Jason Swei, Rajasekar Vaidyanathan, Born-Jiunn Niu
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Publication number: 20160075159Abstract: A printable recording media containing a base substrate; a pre-coat layer including more than about 60 wt % of one or more particulate inorganic pigments by total dry weight of said pre-coat layer; an ink-receiving layer, disposed on said pre-coat layer, comprising a mixture of about 10 to about 90 wt % of a first pigment including precipitated calcium carbonate particles, about 5 to about 60 wt % of a second pigment having a larger size and a different shape than said first pigment particles, and about 1 to about 50 wt % of a third pigment having a surface area of at least 50 m2/gram, wherein said weight percentages are by combined weight of the first, second and third pigments by total dry weight of said ink-receiving layer. Also disclosed herein is a method for producing printed images using said recording media.Type: ApplicationFiled: April 24, 2013Publication date: March 17, 2016Inventors: Xi Zeng, JR., Lokendra Pal, Rajasekar Vaidyanathan
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Publication number: 20110003097Abstract: A print medium for ink-jet printing comprises a photobase substrate, a porous ink-receiving layer and a subbing layer. The photobase substrate can include paper and a moisture barrier layer coated on at least one side of the paper. The porous ink-receiving layer can include metal oxide or semi-metal oxide particulates treated with an organosilane reagent and aluminum chlorohydrate, and a polyvinyl alcohol binder. The subbing layer can be disposed between the moisture barrier layer of the photobase and the ink-receiving layer and include a polyvinyl alcohol or a copolymer of a polyvinyl alcohol.Type: ApplicationFiled: January 31, 2008Publication date: January 6, 2011Inventors: Tienteh Chen, Xulong Fu, Rajasekar Vaidyanathan, Bryan Darr, Mark Drake, Christine E. Steichen