Patents by Inventor Richard D. Howells

Richard D. Howells 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).

  • Patent number: 5874616
    Abstract: A method for preparing fluoroalkylsulfonyl imides by reacting a fluoroalkylsulfonamide with a fluoroalkylsulfonyl halide or a fluorosulfonyl halide in the presence of a non-nucleophilic base. One reaction is:Z--R.sub.f --SO.sub.2 NH.sub.2 +Z--R'.sub.f --SO.sub.2 --X+2B(Z--R.sub.f --SO.sub.2)(Z--R'.sub.f --SO.sub.2)N.sup.-.BH.sup.+ +BHX,where each Z is a fluorine atom or a polymerizable organic functional group, R.sub.f and R'.sub.f are fluoroalkylene groups optionally containing catenary oxygen or nitrogen, X is a halogen atom, and B is a non-nucleophilic base.Unsymmetrical imides and polymeric imides can be prepared.
    Type: Grant
    Filed: December 22, 1995
    Date of Patent: February 23, 1999
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Richard D. Howells, William M. Lamanna, Alan D. Fanta, Jennifer Waddell
  • Patent number: 5099026
    Abstract: Fluorochemical oxazolidinone compositions are provided. They are normally solid, water-insoluble, fluoroaliphatic radical-containing 2-oxazolidinone compounds which have one or more 2-oxazolidinone moieties, at least one of which has a monovalent fluoroaliphatic radical bonded to the 5-position carbon atom thereof by an organic linking group.
    Type: Grant
    Filed: February 7, 1991
    Date of Patent: March 24, 1992
    Inventors: Davis H. Crater, Richard D. Howells, Richard M. Stern, John A. Temperante
  • Patent number: 5025052
    Abstract: Fluorochemical oxazolidinones compositions are provided. They ar normally solid, water-insoluble, fluoroaliphatic radical-containing 2-oxazolidinone compounds which have one or more 2-oxazolidinone moieties, at least one of which has a monovalent fluoroaliphatic radical bonded to the 5-position carbon atom thereof by an organic linking group.
    Type: Grant
    Filed: February 27, 1990
    Date of Patent: June 18, 1991
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Davis H. Crater, Richard D. Howells, Richard M. Stern, John A. Temperante
  • Patent number: 4668726
    Abstract: Cationic and non-ionic fluorochemicals, mixtures of cationic and non-ionic fluorochemicals, blends of the mixtures with fluorochemical poly(oxyalkylenes), and compositions of the fluorochemicals with hydrocarbon nonionic surfactants are provided. These fluorochemicals and compositions, in dispersions, emulsions and microemulsions, may be applied to porous fibrous substrates to give oil and water repellancy and soil resistance.
    Type: Grant
    Filed: December 30, 1985
    Date of Patent: May 26, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Richard D. Howells
  • Patent number: 4625069
    Abstract: Coordination compounds of rhodium are solid salts having donor ligands of [(aryl).sub.3 P].sub.3 Rh.sup.+ and a non-coordinated counterion derived from a fluorochemical acid, the salts having the formula:[(aryl).sub.3 P].sub.3 Rh.sup.+ (counterion).sup.-.The salts are prepared by reacting [(aryl).sub.3 P].sub.4 RhH, which is and uncharged rhodium hydride, with a fluorochemical acid selected form acids having the formulae:HC(R)(SO.sub.2 R.sub.f).sub.2, R.sub.f 'SO.sub.3 H, and HN(SO.sub.2 R.sub.f).sub.2wherein R.sub.f and R.sub.f ' are perfluoroalkyl groups and R is lower alkyl substituted or unsubstituted phenyl, hydrogen, Cl, SO.sub.2 R.sub.f or R.sub.f. Carbonylation of the [(aryl).sub.3 P].sub.3 Rh.sup.+ (counterion).sup.- compounds of this invention, e.g., by contacting the salts of the invention with carbon monoxide gas, produces salts having the formula:[(aryl).sub.3 P].sub.3 Rh(CO).sub.n.sup.+(counterion).sup.-,wherein n is 1 or 2, and (counterion).sup.- is as defined above.
    Type: Grant
    Filed: August 26, 1985
    Date of Patent: November 25, 1986
    Assignee: Minnesota Mining and Manufacturing
    Inventors: Allen R. Siedle, Richard D. Howells
  • Patent number: 4582882
    Abstract: Fluorochemical copolymers, useful as wet-end papermaking additives which impart oil and water repellency and food stain resistance to ovenable paperboard under food cooking conditions, and as a treatment for imparting oil and water repellency to textile fibers. The fluorochemical copolymers are derived (by weight) from about 60 to 80% fluorochemical acrylate, 1 to 30% halogenated alkyl or alkoxyalkyl acrylate, 1 to 15% glycidyl acrylate or methacrylate, 1 to 6% of certain cationic acrylates or methacrylates, and 0 to 20% vinylidene chloride.
    Type: Grant
    Filed: April 5, 1985
    Date of Patent: April 15, 1986
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Michael M. Lynn, Richard D. Howells
  • Patent number: 4566981
    Abstract: Cationic and non-ionic fluorochemicals, mixtures of cationic and non-ionic fluorochemicals, blends of the mixtures with fluorochemical poly(oxyalkylenes), and compositions of the fluorochemicals with hydrocarbon nonionic surfactants are provided. These fluorochemicals and compositions, in dispersions, emulsions and microemulsions, may be applied to porous fibrous substrates to give oil and water repellancy and soil resistance.
    Type: Grant
    Filed: March 30, 1984
    Date of Patent: January 28, 1986
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Richard D. Howells
  • Patent number: 4556720
    Abstract: Coordination compounds of rhodium are solid salts having donor ligands of [(aryl).sub.3 P].sub.3 Rh.sup.+ and a non-coordinated counterion derived from a fluorochemical acid, the salts having the formula:[(aryl).sub.3 P].sub.3 Rh.sup.+ (counterion).sup.-.The salts are prepared by reacting [(aryl).sub.3 P].sub.4 RhH, which is an uncharged rhodium hydride, with a fluorochemical acid selected form acids having the formulae:HC(R)(SO.sub.2 R.sub.f).sub.2, R.sub.f 'SO.sub.3 H, and HN(SO.sub.2 R.sub.f).sub.2wherein R.sub.f and R.sub.f ' are perfluoroalkyl groups and R is lower alkyl substituted or unsubstituted phenyl, hydrogen, Cl, SO.sub.2 R.sub.f or R.sub.f. Carbonylation of the [(aryl).sub.3 P].sub.3 Rh.sup.+ (counterion).sup.- compounds of this invention, e.g., by contacting the salts of the invention with carbon monoxide gas, produces salts having the formula:[(aryl).sub.3 P].sub.3 Rh(CO).sub.n.sup.+ (counterion).sup.-,wherein n is 1 or 2, and (counterion).sup.- is as defined above.
    Type: Grant
    Filed: October 12, 1983
    Date of Patent: December 3, 1985
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Allen R. Siedle, Richard D. Howells
  • Patent number: 4540497
    Abstract: Novel fluoroaliphatic radical-containing, substituted guanidines useful in the form of organic solutions or aqueous dispersions in the treatment of fibrous substrates, such as textile fibers, to impart oil and water repellency.
    Type: Grant
    Filed: November 9, 1982
    Date of Patent: September 10, 1985
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: John C. Chang, Richard D. Howells
  • Patent number: 4533713
    Abstract: Compounds containing (a) a fluoroaliphaticsulfonamido moiety, and (b) a moiety containing (1) at least two oxirane groups, (2) at least two non-terminal N-.beta.-hydroxyalkylene groups, or (3) at least one oxirane group and at least one non-terminal N-.beta.-hydroxyalkylene group. The compound is capable of being cured with a curing agent to give a cured product having excellent water resistance and oil resistance.
    Type: Grant
    Filed: May 6, 1983
    Date of Patent: August 6, 1985
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Richard D. Howells
  • Patent number: 4525423
    Abstract: Fluorochemical copolymers, useful as wet-end papermaking additives which impart oil and water repellency and food stain resistance to ovenable paperboard under food cooking conditions, and as a treatment for imparting oil and water repellency to textile fibers. The fluorochemical copolymers are derived (by weight) from about 60 to 80% fluorochemical acrylate, 1 to 30% halogenated alkyl or alkoxyalkyl acrylate, 1 to 15% glycidyl acrylate or methacrylate, 1 to 6% of certain cationic acrylates or methacrylates, and 0 to 20% vinylidene chloride.
    Type: Grant
    Filed: October 13, 1982
    Date of Patent: June 25, 1985
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Michael M. Lynn, Richard D. Howells
  • Patent number: 4474982
    Abstract: 1-Halomethyl-2-alkoxyethyl acrylates and methacrylates useful for making acrylate and methacrylate polymers and copolymers. Preferred monomers are used to prepare fluorochemical copolymers which impart oil and water repellency to cellulosic materials and textile fibers. The fluorochemical copolymers are derived (by weight) from about 1 to 30% of the preferred monomers, 60 to 80% fluorochemical acrylate, 1 to 15% glycidyl acrylate or methacrylate, 1 to 6% of certain cationic acrylates or methacrylates, and 0 to 20% vinylidene chloride.
    Type: Grant
    Filed: October 13, 1982
    Date of Patent: October 2, 1984
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Richard D. Howells