Patents Assigned to Micron Separations, Inc.
  • Vacuum filter funnel
    Patent number: 5695639
    Abstract: A greatly simplified improved vacuum filter funnel consists of two pieces, namely an upper reservoir member and a lower spout member. The upper reservoir member has an annular ring downwardly extending from the bottom thereof which fits inside an annular rim upwardly extending from the top of the lower spout member. A filter disk rests on an integral grid at the top of the lower spout member and is held in place between the upper and lower members by solely the weight of the upper member. The filter disk is readily removed after simply lifting up the upper reservoir member. Both the reservoir and spout members are preferably constructed of a chemical and heat resistant organic plastic, for example polysulfone, so that the parts may be sterilized in an autoclave.
    Type: Grant
    Filed: January 30, 1996
    Date of Patent: December 9, 1997
    Assignee: Micron Separations, Inc.
    Inventor: James S. Johnson
  • Aromatic/aliphatic nylon polymer microporous membranes
    Patent number: 5693231
    Abstract: Polyamide (nylon) microporous membranes are prepared from a polyamide (nylon) polymer which contains aromatic rings, aliphatic carbon chains, and amide groups. The membranes exhibit improved long term performance characteristics.
    Type: Grant
    Filed: May 8, 1995
    Date of Patent: December 2, 1997
    Assignee: Micron Separations, Inc.
    Inventors: James S. Johnson, Michael J. Witham, Edward T. Carter
  • Alcohol-insoluble nylon microporous membranes
    Patent number: 5411663
    Abstract: Alcohol-insoluble polyamide (nylon) microporous separation membranes are prepared from alcohol-soluble polyamide (nylon) polymers. The membranes are hydrophilic and contain crosslinked amide groups of the structure: ##STR1## wherein d is an integer of about 1 to 3.
    Type: Grant
    Filed: March 17, 1993
    Date of Patent: May 2, 1995
    Assignee: Micron Separations, Inc.
    Inventor: James S. Johnson
  • Heat resistant microporous material production and products
    Patent number: 5215662
    Abstract: Microporous nylon materials which retain near constant time to hydrosaturation during and after heating to temperatures necessary for sealing together a plurality of surfaces, and the synthesis thereof. Nylon 46 dissolved into a mixture of liquid nylon 46 solvents and nonsolvents is dispersed on a fabric substrate, then precipitated to form a laminate, from which a wash removes the nonsolvents and forms the microporous material.
    Type: Grant
    Filed: September 17, 1990
    Date of Patent: June 1, 1993
    Assignee: Micron Separations Inc.
    Inventors: James S. Johnson, Edward T. Carter
  • Process for producing supported celluosic membranes and products
    Patent number: 4894157
    Abstract: A continuous process for producing a microporous cellulosic membranes supported with an integral non-woven polymer web by preparing a casting lacquer comprising at least one cellulosic polymer, at least one solvent and at least one non-solvent wherein the casting lacquer is at the point of incipient gelation.
    Type: Grant
    Filed: October 5, 1987
    Date of Patent: January 16, 1990
    Assignee: Micron Separations, Inc.
    Inventor: James S. Johnson