Patents by Inventor Ashok N. Prabhu
Ashok N. Prabhu 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: 4733018Abstract: Improved copper conductor inks useful in fabricating multilevel circuits are provided. The inks comprise copper powder, a novel zinc-aluminum-lead-borosilicate glass frit, bismuth oxide and a suitable organic vehicle. The inks are advantageous in that the films formed therefrom are oxidation resistant and have a reduced tendency for flux components to leach into adjacent dielectric films.Type: GrantFiled: October 2, 1986Date of Patent: March 22, 1988Assignee: RCA CorporationInventors: Ashok N. Prabhu, Kenneth W. Hang, Edward J. Conlon
-
Patent number: 4619836Abstract: A method is disclosed for fabricating thick film electrical components which are exceptionally uniform in electrical properties and have increased density wherein a thick film ink comprised of (i) an organic vehicle which is reactive with a plasma to form gaseous reaction products at a temperature below its thermal decomposition temperature, (ii) a glass frit having a glass transition temperature above the thermal degradation temperature, and (iii) a particulate material having the desired electrical properties for the thick film electrical component are applied to a suitable substrate in a pattern corresponding to the electrical component. The applied layer is then subjected to a suitable plasma at a temperature below the thermal degradation temperature for a time sufficient to remove the organic vehicle from the applied layer. The resultant layer is then heated at or above the glass transition temperature of the glass frit until the glass frit fuses and forms a composite with the particulate material.Type: GrantFiled: December 31, 1985Date of Patent: October 28, 1986Assignee: RCA CorporationInventors: Ashok N. Prabhu, Edward J. Conlon, Franco N. Sechi
-
Patent number: 4479890Abstract: An improved ink composition suitable for the formation of thick film resistor inks which can be terminated directly to copper foil conductors. The subject compositions comprise an epoxy resin, conductive carbon particles, a suitable solvent and particulate alumina, wherein the alumina is present in an amount at least equal to the resin content on a weight basis.Type: GrantFiled: October 5, 1982Date of Patent: October 30, 1984Assignee: RCA CorporationInventors: Ashok N. Prabhu, Simon M. Boardman
-
Patent number: 4467009Abstract: Improved medium and high value resistor inks are disclosed. The subject inks comprise indium oxide, a barium calcium borosilicate glass frit, a suitable organic vehicle and a temperature coefficient of resistance modifier selected from the group consisting of ferric oxide and vanadium oxide.Type: GrantFiled: January 21, 1983Date of Patent: August 21, 1984Assignee: RCA CorporationInventors: Ashok N. Prabhu, Kenneth W. Hang
-
Patent number: 4452844Abstract: Low value resistor inks comprising a conductive component consisting of stannous oxide and molybdenum trioxide or a mixture of molybdenum trioxide and metallic molybdenum; a glass powder selected from the group consisting of a barium aluminum borate glass and a barium calcium borosilicate glass; and a suitable organic vehicle are improved by the addition of a TCR modifier. Cadmium oxide is added to raise the TCR value of the subject resistor inks, and ferric oxide, vanadium oxide or mixtures thereof is added to lower the TCR value thereof.Type: GrantFiled: January 21, 1983Date of Patent: June 5, 1984Assignee: RCA CorporationInventors: Ashok N. Prabhu, Kenneth W. Hang
-
Patent number: 4415624Abstract: Improved air-fireable resistor and conductor inks useful in constructing multilayer integrated circuits on porcelain-coated metal substrates are provided. The subject inks comprise a barium calcium borosilicate glass frit, a suitable organic vehicle, and a functional component, i.e., ruthenium dioxide, in the resistor inks and one or more precious metals plus bismuth oxide in the conductor inks.Type: GrantFiled: January 3, 1983Date of Patent: November 15, 1983Assignee: RCA CorporationInventors: Ashok N. Prabhu, Kenneth W. Hang
-
Patent number: 4401709Abstract: Improved thick-film overglaze inks useful in constructing multilayer integrated circuits on circuit boards, particularly porcelain-coated metal circuit boards, are provided. The subject inks comprise: a glass consisting of lead oxide, a modifier component consisting of the oxides of cadmium, zinc, barium and antimony and a glass-forming component consisting of aluminum oxide, boron trioxide and silicon dioxide; a suitable organic vehicle and, if desired, a colorant oxide.Type: GrantFiled: July 9, 1982Date of Patent: August 30, 1983Assignee: RCA CorporationInventors: Ashok N. Prabhu, Kenneth W. Hang
-
Patent number: 4399320Abstract: Improved conductor inks useful in constructing multilayer circuits, particularly on porcelain-coated metal substrates, are provided. The subject inks comprise: copper powder, a barium calcium borosilicate glass frit, a suitable organic vehicle and bismuth oxide, which is present either in admixture with the copper powder or as a component of the glass frit.Type: GrantFiled: July 9, 1982Date of Patent: August 16, 1983Assignee: RCA CorporationInventors: Ashok N. Prabhu, Kenneth W. Hang
-
Patent number: 4380750Abstract: Improved indium oxide resistor inks useful in constructing multilayer integrated circuits, particularly on porcelain-coated metal substrates, are provided. The subject inks, which are characterized by an improved temperature coefficient of resistance (TCR), comprise: indium oxide, magnesium oxide as a TCR controlling agent, a barium calcium borosilicate glass frit and a suitable organic vehicle.Type: GrantFiled: July 6, 1981Date of Patent: April 19, 1983Assignee: RCA CorporationInventors: Ashok N. Prabhu, Kenneth W. Hang
-
Patent number: 4379195Abstract: Improved resistor inks useful in constructing multilayer integrated circuits, particularly on porcelain-coated metal substrates, are provided. The subject inks comprise: a conductive component consisting of stannous oxide and molybdenum trioxide or a mixture of molybdenum trioxide and metallic molybdenum; a glass powder selected from the group consisting of a barium aluminum borate glass and a barium calcium borosilicate glass; and a suitable organic vehicle.Type: GrantFiled: July 6, 1981Date of Patent: April 5, 1983Assignee: RCA CorporationInventors: Ashok N. Prabhu, Kenneth W. Hang
-
Patent number: 4377642Abstract: Improved thick-film overglaze inks useful in constructing multilayer integrated circuits on circuit boards, particularly porcelain-coated metal circuit boards, are provided. The subject inks comprise: a glass consisting of lead oxide, a modifier component consisting of the oxides of cadmium, zinc, barium and antimony and a glass-forming component consisting of aluminum oxide, boron trioxide and silicon dioxide; a suitable organic vehicle and, if desired, a colorant oxide.Type: GrantFiled: July 6, 1981Date of Patent: March 22, 1983Assignee: RCA CorporationInventors: Ashok N. Prabhu, Kenneth W. Hang
-
Patent number: 4376725Abstract: Improved conductor inks useful in constructing multilayer circuits, particularly on porcelain-coated metal substrates, are provided. The subject inks comprise: copper powder, a barium calcium borosilicate glass frit, a suitable organic vehicle and bismuth oxide, which is present either in admixture with the copper powder or as a component of the glass frit.Type: GrantFiled: July 6, 1981Date of Patent: March 15, 1983Assignee: RCA CorporationInventors: Ashok N. Prabhu, Kenneth W. Hang
-
Patent number: 4369254Abstract: Novel thick-film crossover dielectric inks useful in constructing multilayer circuits on suitable substrates are provided. The subject inks comprise a barium magnesium borosilicate glass powder, a pinhole reducing component comprising silicon dioxide, an alkaline earth aluminum borosilicate glass having a high softening point or mixtures thereof and a suitable organic vehicle.Type: GrantFiled: July 6, 1981Date of Patent: January 18, 1983Assignee: RCA CorporationInventors: Ashok N. Prabhu, Kenneth W. Hang
-
Patent number: 4369220Abstract: Novel thick-film crossover dielectric inks useful in constructing multilayer circuits on suitable substrates are provided. The subject inks comprise a barium magnesium borosilicate glass powder, a pinhole reducing component comprising silicon dioxide, an alkaline earth aluminum borosilicate glass having a high softening point or mixtures thereof and a suitable organic vehicle.Type: GrantFiled: May 5, 1982Date of Patent: January 18, 1983Assignee: RCA CorporationInventors: Ashok N. Prabhu, Kenneth W. Hang