Method of manufacturing porous polytetrafluoroethylene...

Details Method of manufacturing porous polytetrafluoroethylene... Method of manufacturing porous polytetrafluoroethylene...

2007-03-23

2010-12-07

Greene, Jason M (Department: 1797)

Gas separation: processes

Selective diffusion of gases

Selective diffusion of gases through substantially solid...

C095S273000, C096S004000, C096S013000, C096S014000, C055S522000, C055S525000, C055SDIG007, C264S210700, C264S288800, C264S289300, C264S291000, C264S294000, C428S311510, C428S315500

Reexamination Certificate

active

07846238

ABSTRACT:
Provided is a method of manufacturing a porous polytetrafluoroethylene (PTFE) membrane capable of achieving both a high collection efficiency and a low pressure drop, though it has a larger average pore size and a greater thickness than conventional porous PTFE membranes. This manufacturing method includes: stretching an unsintered polytetrafluoroethylene sheet by a factor of 5 to 30 in a predetermined direction at a temperature equal to or higher than the melting point of polytetrafluoroethylene; further stretching the stretched sheet by a factor of 5 to 40 in a direction different from the predetermined direction at a temperature lower than the melting point; and after the stretchings, heating the stretched sheet at a temperature equal to or higher than the melting point.

REFERENCES:
patent: 5510176 (1996-04-01), Nakamura et al.
patent: 5772884 (1998-06-01), Tanaka et al.
patent: 5814405 (1998-09-01), Branca et al.
patent: 5910277 (1999-06-01), Ishino et al.
patent: 6030428 (2000-02-01), Ishino et al.
patent: 6261979 (2001-07-01), Tanaka et al.
patent: 0 661 336 (1995-07-01), None
patent: 7-196831 (1995-08-01), None
patent: 10-030031 (1998-02-01), None
patent: 10-165787 (1998-06-01), None
patent: 10-165787 (1998-06-01), None
patent: 10-287759 (1998-10-01), None
patent: 11-080397 (1999-03-01), None
patent: 11-080397 (1999-03-01), None
patent: 2004-231756 (2004-08-01), None
patent: WO 94/16802 (1994-08-01), None
patent: WO 98/26860 (1998-06-01), None

Affiliated with

Also associated with

Rating

Method of manufacturing porous polytetrafluoroethylene... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of manufacturing porous polytetrafluoroethylene..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of manufacturing porous polytetrafluoroethylene... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4225881