Patents Assigned to Department of Science & Technology
  • Patent number: 7692047
    Abstract: 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: Grant
    Filed: September 26, 2007
    Date of Patent: April 6, 2010
    Assignee: Secretary, Department of Science & Technology
    Inventors: Anjali Uday Patel, Nikunj Bhagwatiprasad Bhatt
  • Patent number: 7691171
    Abstract: 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: Grant
    Filed: August 6, 2004
    Date of Patent: April 6, 2010
    Assignee: Department of Science & Technology (DST) A Department under the Ministry of Science and Technology, Government of India
    Inventor: Chandrika Varadachari
  • Patent number: 7670405
    Abstract: 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: Grant
    Filed: August 6, 2004
    Date of Patent: March 2, 2010
    Assignee: Department of Science & Technology (DST)
    Inventor: Chandrika Varadachari
  • Publication number: 20060196240
    Abstract: 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: Application
    Filed: August 6, 2004
    Publication date: September 7, 2006
    Applicant: Department of Science & Technology (DST)
    Inventor: Chandrika Varadachari
  • Patent number: 6617847
    Abstract: 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: Grant
    Filed: April 19, 2002
    Date of Patent: September 9, 2003
    Assignees: Department of Science & Technology, Council of Scientific & Industrial Research
    Inventors: Amitava Mitra, Sarmistha Palit Sagar, Dipak Kumar Bhattacharya
  • Patent number: 6348160
    Abstract: 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: Grant
    Filed: June 2, 2000
    Date of Patent: February 19, 2002
    Assignee: Department of Science & Technology
    Inventors: Akella Bhanumathi, Vakkalanka Venkata Narasimhacharya, Kodidasu Umakantham