Patents Assigned to Department of Science and Technology
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Publication number: 20130095340Abstract: A method of producing a composite plasma spray coating using simultaneous feeding of powder and solution precursor feedstock in a plasma spray gun is disclosed, comprising the steps of a) spraying a powder feedstock comprising micron sized particles into a plasma spray plume; and b) spraying a liquid feedstock comprising liquid precursor solution into the plasma spray plume, wherein the spraying of the powder feedstock and spraying of the liquid feedstock are independently controllable. The method allows control of coating composition and microstructure to deposit nanostructured and microstructured layers either sequentially to form layered coatings, or simultaneously to form either composite coatings or continuously gradient coatings to address diverse applications. Thermal barrier coatings produced using the new method have demonstrated twice the life compared to conventional air plasma sprayed coatings.Type: ApplicationFiled: May 31, 2012Publication date: April 18, 2013Applicants: NEW MATERIALS ( ARCI) DEPARTMENT OF SCIENCE AND TECHNOLOGY, Govt. of IndiaInventors: Govindarajan Sivakumar, Shrikant Vishwanath Joshi
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Patent number: 7692047Abstract: The present invention relates to an improved process for the selective alkylation of phenols using heteropolyacid catalyst supported onto zirconia under mild conditions. The process is economically viable since the catalyst regenerated after the initial reaction on further use gives the product in high yield.Type: GrantFiled: September 26, 2007Date of Patent: April 6, 2010Assignee: Secretary, Department of Science & TechnologyInventors: Anjali Uday Patel, Nikunj Bhagwatiprasad Bhatt
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Patent number: 7691171Abstract: This invention provides a process for the preparation of water insoluble, bio-release iron-manganese fertilizer which comprises, heating phosphoric acid with a mixture of (i) source of iron oxide such as goethite and hematite, (ii) pyrolusite and (iii) one or more basic compound(s) selected from oxide(s) or carbonate(s) of magnesium, calcium, sodium and potassium, (b) neutralisation followed by drying and pulverisation.Type: GrantFiled: August 6, 2004Date of Patent: April 6, 2010Assignee: Department of Science & Technology (DST) A Department under the Ministry of Science and Technology, Government of IndiaInventor: Chandrika Varadachari
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Patent number: 7670405Abstract: This invention describes a process for the preparation of bio-release molybdenum fertilizers which comprises heating molybdenum trioxide, one or more basic compound(s) of metal(s) selected from magnesium, calcium and sodium, and phosphoric acid till a solid polyphosphate is obtained and finally obtaining the dried powder.Type: GrantFiled: August 6, 2004Date of Patent: March 2, 2010Assignee: Department of Science & Technology (DST)Inventor: Chandrika Varadachari
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Publication number: 20080114192Abstract: The present invention relates to an improved process for the selective alkylation of phenols using heteropolyacid catalyst supported onto zirconia under mild conditions. The process is economically viable since the catalyst regenerated after the initial reaction on further use gives the product in high yield.Type: ApplicationFiled: September 26, 2007Publication date: May 15, 2008Applicant: Secretary, Department of Science and TechnologyInventors: Anjali Uday Patel, Nikunj Bhagwatiprasad Bhatt
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Publication number: 20060196240Abstract: This invention provides a process for the preparation of water insoluble, bio-release iron-manganese fertilizer which comprises, heating phosphoric acid with a mixture of (i) source of iron oxide such as goethite and hematite, (ii) pyrolusite and (iii) one or more basic compound(s) selected from oxide(s) or carbonate(s) of magnesium, calcium, sodium and potassium, (b) neutralisation followed by drying and pulverisation.Type: ApplicationFiled: August 6, 2004Publication date: September 7, 2006Applicant: Department of Science & Technology (DST)Inventor: Chandrika Varadachari
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Patent number: 6706899Abstract: The present invention relates to a novel acyclic chiral compound of Garcinia acid of formula I, Wherein: R2=R5=lower aryl ester or alkyl ester or substituted aryl alcohol or alkyl alcohol R3=substituted aryl ester or alkyl ester or substituted aryl alcohol R1=R4=hydroxyl or And a process for preparing the sameType: GrantFiled: September 5, 2001Date of Patent: March 16, 2004Assignee: Department of Science and Technology, Technology BhavanInventors: Ibrahim Ibnu Saud, Tom Thomas Puthiyaparampil
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Patent number: 6703515Abstract: The present invention relates to a novel chiral compound of Hibiscus acid bearing lactone moiety of formula I, Wherein: R1═R2═alkali salt of carboxylic acid or acid chloride or lower esters or the N-substituted cyclic imides. R3═hydroxyl or protected hydroxyl group and a process for preparing the same.Type: GrantFiled: September 5, 2001Date of Patent: March 9, 2004Assignee: Department of Science and Technology, Technology BhavanInventors: Ibrahim Ibnu Saud, Chitra Gopinath, Beena Thomas
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Patent number: 6649745Abstract: The present invention relates to a novel oligospirostanoside having the structure 3-0-[&agr;-L-rhamnopyranosyl-(1→2)-&agr;-L-rhamnopyranosyl-(1→4)-0-&bgr;-D-glucopyranosyl]-25(S)-5&bgr;-spirostan-3&bgr;-ol isolated from Asparagus racemosus and to a pharmaceutical composition containing the novel oligospirostanoside and to a method for immunomodulation using said oligospirostanoside by administering a pharmaceutically effective amount of said novel oligospirostanoside.Type: GrantFiled: March 20, 2002Date of Patent: November 18, 2003Assignees: Council of Scientific and Industrial Research, Department of Science and Technology, Zandu Pharmaceutical Works LimitedInventors: Sukhdev Swami Handa, Om Prakash Suri, Vishwa Nath Gupta, Krishan Avtar Suri, Naresh Kumar Satti, Vikram Bhardwaj, Kasturi Lal Bedi, Anamika Khajuria, Anpurna Kaul, Girish G. Parikh, Prabhakar Kulhar, Ulhas Salunkhe, Raman Krishnamurthy
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Patent number: 6617847Abstract: The present invention relate to a device for the non-destructive evaluation of such structures and components as are in service and which are intended to continue in use for an extended period during which time a number of defects such as residual stress, fatigue, creep or the formation of magnetic phase in non-ferromagnetic steel can develop; in addition to its primary purpose of detecting and/or determining the stated defects in-service steel structures or components, the device of the present invention also possesses the advantage that it can be applied for the sorting and classification of steels of different compositions according to the results of defects detected.Type: GrantFiled: April 19, 2002Date of Patent: September 9, 2003Assignees: Department of Science & Technology, Council of Scientific & Industrial ResearchInventors: Amitava Mitra, Sarmistha Palit Sagar, Dipak Kumar Bhattacharya
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Patent number: 6489493Abstract: The present invention relates to a novel acyclic chiral derivatives of Hibiscus acid of formula I, wherein: R1=R5=lower aryl or alkyl ester or substituted aryl or alkyl alcohol R3=substituted aryl or alkyl ester or substituted aryl alcohol R2=R4=hydroxyl or and a process for preparing the same.Type: GrantFiled: September 5, 2001Date of Patent: December 3, 2002Assignee: Department of Science and Technology, Technology BhavanInventors: Ibrahim Ibnu Saud, Rani Rajasekharan Nair
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Patent number: 6489492Abstract: The present invention relates to a novel chiral derivative of Garcinia acid bearing lactone ring moiety of formula I, wherein: R1=R3=alkali salt of carboxyl acid, or acid chloride or lower esters or part of N-substituted cyclic imides. R2=hydroxyl or protected hydroxyl group and a process for preparing the same.Type: GrantFiled: September 5, 2001Date of Patent: December 3, 2002Assignee: Department of Science and TechnologyInventors: Ibrahim Ibnu Saud, Grace Thomas, Paleappadam Vavan Sasi
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Patent number: 6419851Abstract: Melt processable liquid crystalline terpolyesters of the formula I below: where R is Cl, C6H5, CH3CO, CH3, and process for the preparation thereof are disclosed. The process comprises acetylating 8(3-hydroxyphenyl)octanoic acid and hydroquinone using an acetylating agent followed by acidolysis polycondensation for the removal of acetic acid to effect higher molecular weight formation, post-polymerisation being effected at higher temperatures but below the decomposition temperature.Type: GrantFiled: March 28, 2000Date of Patent: July 16, 2002Assignees: Council of Scientific and Industrial Research, Department of Science and TechnologyInventors: Veena Vijayanathan, Vadakkethonippurathu Sivankutty Nair Prasad, Chennakkattu Krishna Sadasivan Pillai
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Patent number: 6409937Abstract: The invention relates to a process for the preparation of melt processable liquid crystalline terpolyesters of the general formula I by the in situ acetylation of a monomer selected from (4-hydroxyphenyl) acetic acid/ 3(4-hydroxyphenyl)propionic acid and hydroquinone/4,4′-biphenol/2,6-naphthylene diol followed by acidolysis polycondensation with or without a solvent and a catalyst, under reduced pressure for the efficient removal of acetic acid to effect higher molecular weight formation. Post polymerisation is effected at higher temperatures below the decomposition temperature purification by soxhlet extraction using solvent mixtures selected from acetone-alcohol, acetone-methylethyl ketone.Type: GrantFiled: March 28, 2000Date of Patent: June 25, 2002Assignees: Council of Scientific & Industrial Research, Department of Science and TechnologyInventors: Vadakkethonippurathu Sivankutty Nair Prasad, Chennakkattu Krishna Sadasivan Pillai, Marayil Ravindranathan
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Patent number: 6348160Abstract: The present invention relates to the preparation of compositions and/or ferroelectric ceramic materials having niobate anions in combination with lead, barium, lanthanum, and bismuth cations. In preferred embodiments, the compositions comprised the formula Pb(x−3y/2−3z/2)Ba(1−x)LayBizNb2O6, wherein x is from about 0.4 to about 0.6, y is from about 0.01 to about 0.03, and z is from about 0.01 to about 0.03. The compositions may be easily poled, and have unexpectedly high piezoelectric charge coefficients and unexpectedly high dielectric constants. The invention also provides processes for preparing the compositions, ferroelectric ceramic materials, and articles comprising the ferroelectric ceramic materials.Type: GrantFiled: June 2, 2000Date of Patent: February 19, 2002Assignee: Department of Science & TechnologyInventors: Akella Bhanumathi, Vakkalanka Venkata Narasimhacharya, Kodidasu Umakantham
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Patent number: 6204424Abstract: An eco-friendly synergistic heterogeneous solid catalyst for use in reactions such as alkylation, acylation, oligomerization, isomerization, hydration, dehydration, etherification, esterification, hydrocracking and nitration of organic compounds comprising: a synergistic combination of sulfated metal oxide and mesoporous zeotypes comprising: Silicon (Si) 50-60 wt %, Zirconium (Zr) 40-50 wt %, Sulfur (S) 5-10 wt % and having a surface area in the range of 200-500 m2/g; a pore volume in the range of 0.1-0.3 m3/g; a pore diameter in the range of 25-35 Å; and a XRD peak at 2&thgr; being 0-3. The invention also covers the process of manufacture of the above catalysts and its use in particular for producing oligomers from alpha-olefins, Friedel-Crafts alkylation and acylation reactions.Type: GrantFiled: December 14, 1998Date of Patent: March 20, 2001Assignee: Secretary, Department of Science and Technology, Government of IndiaInventors: Ganapati Dadasahab Yadav, Munivemmal Sellamuthupillai Krishnan, Nirav Shashikant Doshi, Ajit Atmaram Pujari, Mohamed Sheik Mohamed Mujeebur Rahuman
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Patent number: 6147228Abstract: A process for the isolation of Garcinia acid from the fresh or dried rinds of the fruits of Garcinia indica, Garcinia cambogia and/or Garcinia atroviridis.Type: GrantFiled: July 30, 1999Date of Patent: November 14, 2000Assignee: Department of Science and Technology Government of IndiaInventors: Ibrahim Ibnusaud, Tom Thomas Puthiaparampil, Beena Thomas
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Patent number: 6127553Abstract: The invention relates to a process for the isolation of Hibiscus acid or (+)hydroxycitric acid lactone (2S,3R-dihydroxy-1,2,3-propanetricarboxylic acid lactone) from the leaves of Hibiscus furcatus, Hibiscus sabdariffa and Hibiscus cannabinus. Garcinia acid, one of the optical isomers of hydroxycitric acid is a potentially interesting molecule and found extensive application in the pharmacological as well as synthetic fronts.Type: GrantFiled: July 30, 1999Date of Patent: October 3, 2000Assignee: Department of Science and Technology, Goverment of IndiaInventors: Ibrahim Ibnusaud, Rani Rajasekharan, Teena Philip, Salini Thomas