Title of Invention

A NOVEL METHOD FOR DESIGN PROCESS USING SHEET METALS

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.
Full Text

Documents:

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
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:
# Inventor's Name Inventor's Address
1 PRASHANT P. DATE Department of Mechanical Engineering, IIt Bombay, Powai, Mumbai 400 076
2 ANUP KUMAR SHARMA RESEARCHER, RESEARCH & DEVELOPMENT, TATA STEEL, JAMSHEDPUR 831001
3 S.G. DESAI RESEARCH SCHOLAR, DEPARTMENT OF MECHANICAL ENGINEERING,IIT BOMBAY, POWAI, MUMBAI 400 076
PCT International Classification Number B21D24/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA