Back to results
US 6,395,325 B1Granted
Porous membranes
AssigneeSciMed Life Systems, Inc.
InventorsAnant V. Hedge, David K. Swanson
Life of this patent
Estimating the term…
Abstract
This invention relates to a novel method for the formation of porous hydrophilic membranes, to the membranes themselves, and to uses for them.
Claims42
A method for forming a porous membrane, comprising:
- dissolving one or more polymers in one or more solvents at a temperature at which a true solution of the polymer or polymers forms;
- applying the solution to a surface;
- and,
- drying the applied solution at a temperature that is above the flash point of the solvent or each of the solvents and below the softening point of the polymer or each of the polymers until the solvent or solvents have been substantially completely removed.
1 more element
A method for forming a selectively porous membrane, comprising:
- dissolving one or more first polymers in one or more first solvents at a temperature at which a true solution of the first polymer or polymers forms to obtain a first solution;
- applying the first solution to a surface;
- drying the applied solution at a temperature that is above the flash point of the solvent or each of the solvents and below the softening point of the polymer or each of the polymers until the solvent or solvents have been substantially completely removed to form a porous membrane;
- masking the porous membrane to protect those areas in which porosity is to be maintained;
- dissolving one or more second polymers in one or more second solvents at a temperature at which a true solution of the second polymer or polymers forms to give a second solution;
- applying the second solution to the masked membrane;
- drying the applied second solution at a temperature that is below the flash point of the second solvent or each of the solvents and below the softening point of the second polymer or each of the polymers until the second solvent or solvent have been substantially completely removed to form a non-porous membrane over those portions of the porous membrane where porosity is not to be maintained;
- and,
- removing the mask.
6 more elements
Dependencies are inferred from the claim text.