1
Peter John Degen, Ioannis P Sipsas, Gregory C Rapisarda, Joseph Gregg: Polyvinylidene fluoride membrane and method for removing viruses from solutions. Pall Corporation, Leydig Voit & Mayer, April 7, 1998: US05736051 (40 worldwide citation)

The present invention provides an isotropic, skinless, porous, polyvinylidene fluoride membrane having a K.sub.UF of at least about 15 psi (103 kPa), and preferably below about 50 psi (345 kPa), when tested using liquid pairs having an interfacial tension of about 4 dynes/cm (4 mN/m). The present in ...


2
Peter John Degen, Joseph Yuen Lee, Ioannis P Sipsas: Resilient battery separator. Pall Corporation, Leydig Voit & Mayer, July 8, 1997: US05645956 (8 worldwide citation)

The present invention provides a battery separator comprising a nonwoven web of first and second fibers having a mean diameter of about 15 .mu.m or less, wherein the first fibers comprise at least about 60 wt. % of a first polyolefin having a first melting temperature and no more than about 40 wt. % ...


3
Ioannis P Sipsas, Brian Mullaney, Leigh A Kelderhouse: Polyolefin compositions containing coated mica particles to prevent yellowing and methods therefore. The Mearl Corporation, Ostrolenk Faber Gerb & Soffen, December 27, 1994: US05376698 (8 worldwide citation)

Antioxidant containing polyolefin compositions are provided including titanium dioxide-coated mica particles comprising a coating of silica and alumina calcined thereon to prevent yellowing of the compositions. Process for preventing the yellowing of antioxidant containing polyolefin compositions is ...


4
Joseph Y Lee, Richard F Salinaro, Ioannis P Sipsas: Method of removing metal ions using an ion exchange membrane. Pall Corporation, Leydig Voit & Mayer, April 30, 2002: US06379551 (7 worldwide citation)

The present invention provides an ion exchange membrane having a porous polymeric support grafted with an organic moiety to which is covalently bonded at least one ion exchange group, and methods for preparing the ion exchange membrane. A method for treating a fluid containing ions wherein ions are ...


5
Ioannis P Sipsas, Isaac Rothmann, Irving Joffee: Uniform polyvinylidene difluoride membranes. Pall Corporation, Leydig Voit & Mayer, March 30, 1993: US05198505 (5 worldwide citation)

A heat-treated, hydrophobic, polyvinylidene difluoride membrane is provided having uniform crystallinity as evidenced by a difference in crystallinity over the membrane of less than about 10 percent. Also provided is a hydrophilic, polyvinylidene difluoride membrane prepared from a heat-treated, hyd ...


6
Ioannis P Sipsas, Isaac Rothmann, Irving Joffee: Method for making uniform polyvinylidene difluoride membranes. Pall Corporation, Leydig Voit & Mayer, March 23, 1993: US05196508 (3 worldwide citation)

A method is provided for enhancing the characteristics of a hydrophobic polyvinylidene difluoride membrane which comprises heating the membrane to a temperature of at least 80.degree. C. but less than the temperature at which the membrane softens and deforms for a time sufficient to achieve a state ...


7
Peter J Degen, Joseph Y Lee, Ioannis P Sipsas, Ralph B DiPalma: Rechargeable batteries and methods of preparing same. Pall Corporation, Leydig Voit & Mayer, July 7, 1998: US05776629 (1 worldwide citation)

The present invention provides a rechargeable battery comprising (a) a container having a top, a bottom, and one or more side walls, and, positioned within the container, (b) an anode subject to shedding during charge/discharge cycling, (c) a cathode subject to shedding during charge/discharge cycli ...


8
Peter John Degen, Joseph Yuen Lee, Ioannis P Sipsas: Resilient battery separator. Pall, December 11, 1996: TW293186

The present invention provides a battery separator comprising a ?nonwoven web of first and second fibers having a mean diameter of ?about 15 (muon)m or less, in which the first fibers comprise at ?least about 60 wt.% of a first polyolefin having a first melting ?temperature and no more than about 40 ...


9