Title of Invention | A NOVEL METHOD FOR DESIGN PROCESS USING SHEET METALS |
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Abstract | This invention relates to the preparation of ferrofluids wherein the precipitation of the magnetic particles are effected in the presence of surface modifying agents to obtain narrow particle size distribution (3 to 15 nm) that are amenable to controlled dispersion in liquid medium to produce tailored ferrofluids. A novel two stage process for the preparation of ferrofluid is adopted. Stage i involves the precipitation of the superparamagnetic particles of magnetite in the presence of surface modifying agents at pH between 8 and 10.5 that are further processed to obtain surface modified mangetic particles. Stage II involves the dispersion of the as prepared dried superparamaagnetic particles in a known volume of carrier liquid to obtain tailored ferrofluids without any dilution or further processing. This method is superior to prior processes as dried powder with specific magnetic prperties can be used to manufacture tailored ferrofluids. In addition, transportation is simpler and non hazardous. |
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474-mum-2004-claims(20-4-2005).pdf
474-MUM-2004-CLAIMS(AMENDED)-(13-8-2010).pdf
474-MUM-2004-CLAIMS(AMENDED)-(26-8-2011).pdf
474-mum-2004-correspondence(20-4-2005).pdf
474-mum-2004-correspondence(ipo)-(17-3-2010).pdf
474-mum-2004-description(complete)-(20-4-2005).pdf
474-mum-2004-description(provisional)-(21-4-2004).pdf
474-mum-2004-drawing(20-4-2005).pdf
474-mum-2004-form 1(20-4-2005).pdf
474-mum-2004-form 1(21-4-2004).pdf
474-mum-2004-form 18(29-1-2006).pdf
474-mum-2004-form 2(complete)-(20-4-2005).pdf
474-mum-2004-form 2(provisional)-(21-4-2004).pdf
474-MUM-2004-FORM 2(TITLE PAGE)-(26-8-2011).pdf
474-mum-2004-form 2(title page)-(complete)-(20-4-2005).pdf
474-mum-2004-form 2(title page)-(provisional)-(21-4-2004).pdf
474-mum-2004-form 26(21-4-2004).pdf
474-mum-2004-form 3(20-4-2005).pdf
474-mum-2004-form 3(21-4-2004).pdf
474-mum-2004-form 5(20-4-2005).pdf
474-MUM-2004-FORM 8(15-5-2008).pdf
474-MUM-2004-REPLY TO EXAMINATION REPORT(13-8-2010).pdf
474-MUM-2004-REPLY TO HEARING(26-8-2011).pdf
Patent Number | 249217 | ||||||||||||
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Indian Patent Application Number | 474/MUM/2004 | ||||||||||||
PG Journal Number | 42/2011 | ||||||||||||
Publication Date | 21-Oct-2011 | ||||||||||||
Grant Date | 11-Oct-2011 | ||||||||||||
Date of Filing | 21-Apr-2004 | ||||||||||||
Name of Patentee | INDIAN INSTITUTE OF TECHNOLOGY, BOMBAY | ||||||||||||
Applicant Address | Indian Institute of Technology, Powai, Mumbai 40076 | ||||||||||||
Inventors:
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PCT International Classification Number | B21D24/00 | ||||||||||||
PCT International Application Number | N/A | ||||||||||||
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PCT Conventions:
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