Patents by Inventor Larry C. Takiff
Larry C. Takiff 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).
-
Publication number: 20090325079Abstract: Disclosed is a photopolymerizable holographic recording medium for data storage that comprises colloidal metal, and which exhibits a threshold for a second stage polymerization which is substantially insensitive to the light used for both forming holograms and interrogating the medium during servo and/or read events. Also disclosed is a method of preparing said photopolymerizable holographic recording medium. Also disclosed is a method for preparing a colloidal without additives in a viscous medium.Type: ApplicationFiled: June 22, 2009Publication date: December 31, 2009Inventors: Erdem A. Cetin, Richard T. Ingwall, Richard A. Minns, David A. Waldman, Larry C. Takiff
-
Patent number: 7297448Abstract: Disclosed is a photopolymerizable holographic recording medium for data storage that comprises colloidal metal, and which exhibits a threshold for a second stage polymerization which is substantially insensitive to the light used for both forming holograms and interrogating the medium during servo and/or read events. Also disclosed is a method of preparing said photopolymerizable holographic recording medium. Also disclosed is a method for preparing a colloidal without additives in a viscous medium.Type: GrantFiled: November 20, 2002Date of Patent: November 20, 2007Assignee: Aprilis, Inc.Inventors: Erdem A. Cetin, Richard T. Ingwall, Richard A. Minns, David A. Waldman, Larry C. Takiff
-
Publication number: 20030152842Abstract: Disclosed is a photopolymerizable holographic recording medium for data storage that comprises colloidal metal, and which exhibits a threshold for a second stage polymerization which is substantially insensitive to the light used for both forming holograms and interrogating the medium during servo and/or read events. Also disclosed is a method of preparing said photopolymerizable holographic recording medium. Also disclosed is a method for preparing a colloidal without additives in a viscous medium.Type: ApplicationFiled: November 20, 2002Publication date: August 14, 2003Applicant: Aprilis, Inc.Inventors: Erdem A. Cetin, Richard T. Ingwall, Richard A. Minns, David A. Waldman, Larry C. Takiff
-
Patent number: 6004719Abstract: A process for producing an image uses an imaging medium comprising an acid-generating layer or phase comprising a mixture of a superacid precursor, a sensitizing dye and a secondary acid generator, and a color-change layer comprising an image dye. The sensitizing dye has first and second forms, the first form having substantially greater substantial absorption in a first wavelength range than the second form. The superacid precursor is not capable, in the absence of the first form of the sensitizing dye, of being decomposed by radiation in the first wavelength range. The secondary acid generator is capable of thermal decomposition, catalyzed by superacid, to form a secondary acid. While at least part of the sensitizing dye is in its first form, the medium is imagewise exposed to radiation in the first wavelength range, thereby causing, in the exposed areas of the acid-generating layer, the formation of superacid.Type: GrantFiled: May 19, 1997Date of Patent: December 21, 1999Assignee: Polaroid CorporationInventors: Russell A. Gaudiana, Robert W. Haddock, Serajul Haque, Iris B. Kliman Bloom, John L. Marshall, Socorro M. Ramos, Larry C. Takiff, Stephen J. Telfer, Michael A. Young
-
Patent number: 5741630Abstract: A process for producing and fixing an image uses an imaging medium comprising an acid-generating layer or phase comprising a mixture of a superacid precursor, a sensitizer and a secondary acid generator, and a color-change layer comprising an image dye. The sensitizer can absorb radiation of a sensitizer wavelength which does not, in the absence of the sensitizer, cause decomposition of the superacid precursor to form the corresponding superacid. The secondary acid generator is capable of acid-catalyzed thermal decomposition by the first acid to form a second acid, and the image dye undergoes a color change upon contact with the second acid. The medium is imagewise exposed to radiation of the sensitizer wavelength, thereby causing the sensitizer, in exposed areas, to decompose superacid precursor with formation of the fist acid. The medium is then heated to cause, in the exposed areas, acid-catalyzed thermal decomposition of the secondary acid generator and formation of the second acid.Type: GrantFiled: April 25, 1994Date of Patent: April 21, 1998Assignee: Polaroid CorporationInventors: John L. Marshall, Rita S. Shon Baker, Larry C. Takiff, Stephen J. Telfer, John C. Warner
-
Patent number: 5631118Abstract: A process for producing an image uses an imaging medium comprising an acid-generating layer or phase comprising a mixture of a superacid precursor, a sensitizing dye and a secondary acid generator, and a color-change layer comprising an image dye. The sensitizing dye has first and second forms, the first form having substantially greater substantial absorption in a first wavelength range than the second form. The superacid precursor is capable of being decomposed to produce superacid by radiation in a second wavelength range, but is not, in the absence of the sensitizing dye, capable of being decomposed by radiation in the first wavelength range. The secondary acid generator is capable of acid-catalyzed thermal decomposition by unbuffered superacid to form a secondary acid.Type: GrantFiled: April 28, 1995Date of Patent: May 20, 1997Assignee: Polaroid CorporationInventors: Russell A. Gaudiana, Robert W. Haddock, John L. Marshall, Larry C. Takiff, Stephen J. Telfer, Michael A. Young
-
Patent number: 5582956Abstract: A process for producing and fixing an image uses an imaging medium comprising an acid-generating layer or phase comprising a mixture of a superacid precursor, a sensitizer and a secondary acid generator, and a color-change layer comprising an image dye. The sensitizer can absorb radiation of a sensitizer wavelength which does not, in the absence of the sensitizer, cause decomposition of the superacid precursor to form the corresponding superacid. The secondary acid generator is capable of acid-catalyzed thermal decomposition by the first acid to form a secondary acid, and the image dye undergoes a color change upon contact with the secondary acid. The medium is imagewise exposed to radiation of the sensitizer wavelength, thereby causing the sensitizer, in exposed areas, to decompose superacid precursor with formation of the fist acid. The medium is then heated to cause, in the exposed areas, acid-catalyzed thermal decomposition of the secondary acid generator and formation of the secondary acid.Type: GrantFiled: April 28, 1995Date of Patent: December 10, 1996Assignee: Polaroid CorporationInventors: Anne Ehret, John L. Marshall, Rita S. S. Baker, Larry C. Takiff, Stephen J. Telfer, John C. Warner
-
Patent number: 5441850Abstract: A process for producing an image uses an imaging medium comprising an acid-generating layer or phase comprising a mixture of a superacid precursor, a sensitizing dye and a secondary acid generator, and a color-change layer comprising an image dye. The sensitizing dye has a unprotonated form and a protonated form, the protonated form having substantially greater substantial absorption in a first wavelength range than the unprotonated form. The superacid precursor is capable of being decomposed to produce superacid by radiation in a second wavelength range, but is not, in the absence of the sensitizing dye, capable of being decomposed by radiation in the first wavelength range. The secondary acid generator is capable of acid-catalyzed thermal decomposition by unbuffered superacid to form a second acid.Type: GrantFiled: April 25, 1994Date of Patent: August 15, 1995Assignee: Polaroid CorporationInventors: John L. Marshall, Larry C. Takiff, Stephen J. Telfer
-
Patent number: 5401607Abstract: An infra-red sensitive acid-generating medium comprises a binder, an iodonium salt; and a squarylium dye capable of absorbing infra-red radiation having a wavelength within the range of about 700 to about 1200 nm, the dye having a squarylium ring the 1- and 3-positions of which are each connected, via a single sp.sup.2 carbon atom, to a pyrylium, thiopyrylium, benzpyrylium or benzthiopyrylium nucleus, at least one of the sp.sup.2 carbon atoms having a hydrogen atom attached thereto, and the 2-position of the squarylium ring bearing an O.sup.-, amino or substituted amino, or sulfonamido group.Type: GrantFiled: June 29, 1993Date of Patent: March 28, 1995Assignee: Polaroid CorporationInventors: Larry C. Takiff, Stephen J. Telfer, Kenneth C. Waterman
-
Patent number: 5210064Abstract: The addition, to a thermal imaging medium comprising a color-forming compound which undergoes a change of color upon heating above a color-forming temperature for a color-forming time, the color-forming compound being of the cyclic sulfonamide type described in U.S. Pat. Nos. 4,720,449 and 4,960,901, of a quinone or hydroquinone increases the sensitivity of the imaging medium and helps to prevent fading of images produced therefrom while the images are being projected.Type: GrantFiled: November 20, 1991Date of Patent: May 11, 1993Assignee: Polaroid CorporationInventors: Rita S. Shon Baker, Larry C. Takiff