continued from part 1 - Controller General of Patents, Designs, and ...

(12) PATENT APPLICATION PUBLICATION (21) Application No.6457/DELNP/2008 A
(19) INDIA
(22) Date of filing of Application :23/07/2008 (43) Publication Date : 24/10/2008
(54) Title of the invention : BIAXIALLY ORIENTED MICROPOROUS MEMBRANE
(51) International classification :B29C 65/00 (71)Name of Applicant :
(31) Priority Document No :60/775,112
1)CELGARD LLC
(32) Priority Date :21/02/2006
Address of Applicant :13800 SOUTH LAKES DRIVE
(33) Name of priority country :U.S.A.
CHARLOTTE, NORT CAROLINA 28273, USA. U.S.A.
(86) International Application No :PCT/US2007/062095 (72)Name of Inventor :
Filing Date
:14/02/2007
1)XIANGYUN WEI
(87) International Publication No :WO 2007/098339 2)CHARLES HAIRE
(61) Patent of Addition to Application
Number
Filing Date
:NA
:NA
(62) Divisional to Application Number :NA
Filing Date
:NA
(57) Abstract :
A microporous membrane is made by a dry- stretch process and has substantially round shaped pores and a ratio of machine direction
tensile strength to transverse direction tensile strength in the range of 0.5 to 5.0. The method of making the foregoing microporous
membrane includes the steps of : extruding a polymer into a nonporous precursor, and biaxially stretching the nonporous precursor,
the biaxial stretching including a machine direction stretching and a transverse direction stretching, the transverse direction including a
simultaneous controlled machine direction relax.
No. of Pages : 28 No. of Claims : 23
The Patent Office Journal 24/10/2008 25998