Patents by Inventor David C. Weigel
David C. Weigel 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: 5576074Abstract: A process is described for providing a conductive metal circuit using a coherent radiation source. The circuit pattern is directly written onto a laser addressable element having a supercooling material layer. A conductive metal toner is then applied to the light struck areas and fired in a furnace to provide a conductive metal circuit.Type: GrantFiled: August 23, 1995Date of Patent: November 19, 1996Assignee: Minnesota Mining and Manufacturing CompanyInventors: David C. Weigel, David A. Morgan
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Patent number: 5278024Abstract: A photothermographic composite structure for use in a solvent-free dye thermal positive imaging diffusion-transfer process comprising:(a) an image-receiving element comprising a polymeric dyeable image-receiving layer having a glass transition temperature in the range of 20.degree. to 200.degree. C., and(b) strippably adhered to said image-receiving element, an imageable photothermographic element comprising in at least one layer thereof a binder, a silver source material, photosensitive silver halide in catalytic proximity to said silver source material, and a formazan dye.Type: GrantFiled: December 30, 1992Date of Patent: January 11, 1994Assignee: Minnesota Mining and Manufacturing CompanyInventors: Richard C. Cotner, David C. Weigel, Kumars Sakizadeh
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Patent number: 5275932Abstract: Thermal recording material containing a suitable substrate coated with an image forming layer. The image forming layer contains a thermally reducible source of silver, a 3-indazolinone or urea compound; a polymeric binder; and optionally, an auxiliary reducing agent and toner. Preferably, an anti-stick layer is coated on top of the imaging layer.The 3-indazolinone and urea compounds have been found to enhance the thermal image forming capability of thermal recording material.Type: GrantFiled: July 22, 1992Date of Patent: January 4, 1994Assignee: Minnesota Mining and Manufacturing CompanyInventors: David C. Weigel, Oanh V. Pham
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Patent number: 5206112Abstract: A photothermographic composite structure for use in a solvent-free dye thermal positive imaging diffusion-transfer process comprising:(a) an image-receiving element comprising a polymeric dyeable image-receiving layer having a glass transition temperature in the range of 20.degree. to 200.degree. C., and(b) strippably adhered to said image-receiving element, an imageable photothermographic element comprising in at least one layer thereof a binder, a silver source material, photosensitive silver halide in catalytic proximity to said silver source material, and a formazan dye.Type: GrantFiled: June 27, 1991Date of Patent: April 27, 1993Assignee: Minnesota Mining and Manufacturing CompanyInventors: Richard C. Cotner, David C. Weigel, Kumars Sakizadeh
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Patent number: 5185231Abstract: Certain fluoran dyes have been found to be effective reducing agents for silver ion in dry silver constructions. The fluoran dyes have the following structure: ##STR1## wherein: R.sup.1 represents methyl or n-butyl;R.sup.2 represents n-butyl or cyclohexyl;R.sup.3 represents hydrogen, methyl, or methoxy; andR.sup.4 represents ##STR2## where X represents halogen (preferably chlorine); and a binder.Type: GrantFiled: August 26, 1991Date of Patent: February 9, 1993Assignee: Minnesota Mining and Manufacturing CompanyInventor: David C. Weigel
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Patent number: 5026633Abstract: Photothermographic dry silver emulsions containing a benzylidene lenco dye and a development accelerator provide a high density yellow image upon exposure to actinic radiation and thermal developing at a relatively low temperature and for a short period of time.Type: GrantFiled: July 27, 1989Date of Patent: June 25, 1991Assignee: Minnesota Mining and Manufacturing CompanyInventor: David C. Weigel
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Patent number: 4923792Abstract: A photothermographic element comprising:(A) a coating comprising a support bearing a photothermographic medium, the medium comprising a light sensitive silver halide in reactive association with a silver salt of an organic acid and a color generating reducing agent which is a leuco compound which is oxidizable by silver ions into a colored dye of the general formula: ##STR1## in which: n=0, 1 or 2,R.sup.1 represents H, CN, lower alkyl of 1 to 5 carbon atoms, aryl or COOR.sup.6 in which R.sup.6 is lower alkyl of 1 to 5 carbon atoms or aryl,R.sup.2 and R.sup.3 independently represent CN, NO.sub.2, COOR.sup.6, SO.sub.2 R.sup.6, CONHR.sup.6 in which R.sup.6 is as defined above or R.sup.2 and R.sup.3 together represent the necessary atoms to form a 5- or 6-membered carbocyclic or heterocyclic ring having ring atoms selected from C, N, O and S atoms, whch carbocyclic or heterocyclic rings possess at least one conjugated electron withdrawing substituent,R.sup.4 and R.sup.Type: GrantFiled: June 20, 1989Date of Patent: May 8, 1990Assignee: Minnesota Mining and Manufacturing CompanyInventors: Duncan M. A. Grieve, Stephen S. C. Poon, Tran V. Thien, Kumars Sakizadeh, David C. Weigel
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Patent number: 4883747Abstract: A photothermographic element comprising a support bearing a photothermographic medium, the medium comprising a light sensitive silver halide in reactive association with a silver salt of an organic acid and a color generating reducing agent which is a leuco compound which is oxidisable by silver ions into a colored dye of the general formula: ##STR1## in which: n=0, 1 or 2,R.sup.1 represents H, CN, lower alkyl of 1 to 5 carbon atoms, aryl or COOR.sup.6 in which R.sup.6 is lower alkyl of 1 to 5 carbon atoms or aryl,R.sup.2 and R.sup.3 independently represent CN, NO.sub.2, COOR.sup.6, SO.sub.2 R.sup.6, CONHR.sup.6 in which R.sup.6 is as defined above or R.sup.2 and R.sup.3 together represent the necessary atoms to form a 5- or 6-membered carbocyclic or heterocyclic ring having ring atoms selected from C, N, O and S atoms, which carbocyclic or heterocyclic rings possess at least one conjugated electron withdrawing substituent,R.sup.4 and R.sup.Type: GrantFiled: May 31, 1988Date of Patent: November 28, 1989Assignee: Minnesota Mining and Manufacturing CompanyInventors: Duncan M. A. Grieve, Stephen S. C. Poon, Tran V. Thien, Kumars Sakizadeh, David C. Weigel
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Patent number: 4795697Abstract: Alkyl ketazine dyes are stabilized by the presence of poly(vinyl chloride) and/or poly(vinylidene chloride) binders in photothermographic emulsions.Type: GrantFiled: December 29, 1986Date of Patent: January 3, 1989Assignee: Minnesota Mining and Manufacturing CompanyInventors: Kim M. Vogel, David C. Weigel, Roger A. Mader
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Patent number: 4782010Abstract: The use of phenazine, phenoxazine and phenothiazine color forming developers in photothermographic dry silver emulsions provides a stable imaging system under both light and dark storage.Type: GrantFiled: December 29, 1986Date of Patent: November 1, 1988Assignee: Minnesota Mining and Manufacturing CompanyInventors: Roger A. Mader, David C. Weigel, Louis M. Leichter, Kristen A. Hoff
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Patent number: 4587211Abstract: Certain effective leuco dyes for silver halide/silver salt/reducing agent photothermographic color imaging materials tend to bleach in the final image. The presently disclosed system of a syringaldazine and a stabilizing binder resin is more stable.Type: GrantFiled: February 1, 1985Date of Patent: May 6, 1986Assignee: Minnesota Mining and Manufacturing CompanyInventors: Takuzo Ishida, David C. Weigel
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Patent number: 4585734Abstract: Certain effective toning systems for silver halide/silver salt/reducing agent photothermographic imaging materials tend to bleach the final image. The presently disclosed toning system of phthalazine and an active-hydrogen containing heterocyclic compound is more stable than some previous toners.Type: GrantFiled: February 1, 1985Date of Patent: April 29, 1986Assignee: Minnesota Mining and Manufacturing CompanyInventor: David C. Weigel
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Patent number: 4328181Abstract: Indicator material for monitoring personal exposure to hazardous substances in ambient air comprising a pigment material, a binder and a sensitizer coated upon a transparent support member as a porous coating which permits gaseous diffusion throughout the coating is disclosed. Detection or monitoring is effected when the indicator material undergoes a visually observable reaction with hazardous material in the atmosphere at room temperature.Type: GrantFiled: July 6, 1979Date of Patent: May 4, 1982Assignee: Minnesota Mining and Manufacturing Co.Inventors: Leon W. Anders, David C. Weigel