Patents by Inventor Raimund H. Silva

Raimund H. Silva has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Electrolytic cell with cation exchange membrane having high equivalent weight component
    Patent number: 4544471
    Abstract: Composite fluorocarbon cation exchange membrane having at least two layers of fluorinated polymer containing pendant side chains with sulfonyl groups wherein the equivalent weight of one such layer differs from the adjacent layer by at least 100.
    Type: Grant
    Filed: September 20, 1982
    Date of Patent: October 1, 1985
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Raimund H. Silva, Roger A. Smith
  • Protective clothing of fabric containing a layer of highly fluorinated ion exchange polymer
    Patent number: 4518650
    Abstract: A protective garment fabricated at least in part from a composite fabric which contains a layer of a highly fluorinated ion exchange polymer having sulfonic acid functional groups, all the components of said composite fabric being hydrophilic.
    Type: Grant
    Filed: August 7, 1981
    Date of Patent: May 21, 1985
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Walther G. Grot, Joseph T. Rivers, Raimund H. Silva
  • Sacrificial reinforcements in cation exchange membrane
    Patent number: 4477321
    Abstract: A fluorocarbon cation exchange membrane containing a sacrificial reinforcement for tear resistance which, in use as a cation exchange membrane for alkali metal chloride electrolysis, degrades to provide low voltage operation of the electrolytic cell.
    Type: Grant
    Filed: January 15, 1982
    Date of Patent: October 16, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Thomas C. Bissot, Raimund H. Silva
  • Protective clothing of fabric containing a layer of highly fluorinated ion exchange polymer
    Patent number: 4469744
    Abstract: A protective garment fabricated at least in part from a fabric which contains a layer of a highly fluorinated ion exchange polymer having functionality of the sulfonic and/or carboxylic type in the form of an alkali metal, ammonium or amine salt.
    Type: Grant
    Filed: August 7, 1981
    Date of Patent: September 4, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Walther G. Grot, Joseph T. Rivers, Raimund H. Silva
  • Solvents of carboxyl ester compounds and fluoropolymers
    Patent number: 4446269
    Abstract: Solutions are disclosed with solvents having completely halogenated, saturated, hydrocarbon backbones and solubility parameters within a particular range. Preferred solvent have at least one ether linkage. An exemplary solvent is ##STR1## wherein X is F, Cl, Br, and I; n is 0, 1, and 2; m is 1, 2, and 3; and Y is COOCH.sub.3 and SO.sub.2 F. The solutions include perfluorinated copolymers having high equivalent weight which have been prepared from tetrafluoroethylene and perfluorinated sulfonyl fluoride- or carboxyl-containing vinyl monomers.
    Type: Grant
    Filed: March 3, 1982
    Date of Patent: May 1, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Raimund H. Silva, Paul R. Resnick, Roger A. Smith
  • Membranes and composites from fluoropolymer solutions
    Patent number: 4414280
    Abstract: Solutions and membranes formed therefrom are disclosed with solvents having completely halogenated, saturated, hydrocarbon backbones and solubility parameters within a particular range. Preferred solvent have at least one ether linkage. An exemplary solvent is ##STR1## wherein X is F, Cl, Br, and I; n is 0, 1, and 2; m is 1, 2, and 3; and Y is COOCH.sub.3 and SO.sub.2 F. The solutions include perfluorinated copolymers having high equivalent weight which have been prepared from tetrafluoroethylene and perfluorinated sulfonyl fluoride- or carboxyl-containing vinyl monomers.
    Type: Grant
    Filed: December 3, 1981
    Date of Patent: November 8, 1983
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Raimund H. Silva, Paul R. Resnick, Roger A. Smith
  • Cation exchange membrane with high equivalent weight component
    Patent number: 4411750
    Abstract: Composite fluorocarbon cation exchange membrane having at least two layers of fluorinated polymer containing pendant side chains with sulfonyl groups wherein the equivalent weight of one such layer differs from the adjacent layer by at least 100.
    Type: Grant
    Filed: September 20, 1982
    Date of Patent: October 25, 1983
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Raimund H. Silva, Roger A. Smith
  • Cation exchange membrane with high equivalent weight component
    Patent number: 4401711
    Abstract: Composite fluorocarbon cation exchange membrane having at least two layers of fluorinated polymer containing pendant side chains with sulfonyl groups wherein the equivalent weight of one such layer differs from the adjacent layer by at least 100.
    Type: Grant
    Filed: November 2, 1981
    Date of Patent: August 30, 1983
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Raimund H. Silva, Roger A. Smith
  • Solutions of sulfonyl fluoride compounds and fluoropolymers
    Patent number: 4348310
    Abstract: Solutions are disclosed with solvents having completely halogenated, saturated, hydrocarbon backbones and solubility parameters within a particular range. Preferred solvent have at least one ether linkage. An exemplary solvent is ##STR1## wherein X is F, Cl, Br, and I; n is 0, 1, and 2; m is 1, 2, and 3; and Y is COOCH.sub.3 and SO.sub.2 F. The solutions include perfluorinated copolymers having high equivalent weight which have been prepared from tetrafluoroethylene and perfluorinated sulfonyl fluoride- or carboxyl-containing vinyl monomers.
    Type: Grant
    Filed: August 8, 1980
    Date of Patent: September 7, 1982
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Raimund H. Silva, Paul R. Resnick, Roger A. Smith