Patents by Inventor Donald F. Hagen
Donald F. Hagen 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).
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Patent number: 6365769Abstract: Novel mixtures of perfluoroalkyl halides and derivatives thereof are described. These mixtures contain some compounds with a straight perfluoroalkyl group and some with a branched perfluoroalkyl group. Methods of preparation and use are also described.Type: GrantFiled: February 15, 2000Date of Patent: April 2, 2002Assignee: 3M Innovative Properties CompanyInventors: Frederick E. Behr, Rudolf J. Dams, Johan E. DeWitte, Donald F. Hagen
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Patent number: 6048952Abstract: Novel mixtures of perfluoroalkyl halides and derivatives thereof are described. These mixtures contain some compounds with a straight perfluoroalkyl group and some with a branched perfluoroalkyl group. Methods of preparation and use are also described.Type: GrantFiled: February 4, 1997Date of Patent: April 11, 2000Assignee: 3M Innovative Properties CompanyInventors: Frederick E. Behr, Rudolf J. Dams, Johan E. DeWitte, Donald F. Hagen
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Patent number: 5993935Abstract: A composite article is provided having covalently reactive particles incorporated in a continuous, porous matrix. The reactive particles have surfaces of covalently reactive functional groups capable of directly forming covalent chemical bonds with ligands without need for an intermediate activation step. An adduct composite article is also provided comprising a continuous, porous matrix and derivatized particles dispersed therein. The derivatized particles comprise a direct, covalent reaction product of ligand with the covalently reactive particles. Methods of making and using the composite articles and adduct composite articles are also provided. Preferred covalently reactive functional groups are azlactone-functional groups of the formula: ##STR1## wherein: R.sup.1 and R.sup.Type: GrantFiled: October 11, 1991Date of Patent: November 30, 1999Assignee: 3M Innovative Properties CompanyInventors: Jerald K. Rasmussen, Steven M. Heilmann, Larry R. Krepski, Patrick L. Coleman, Dean S. Milbrath, Margaret M. Walker, Donald F. Hagen, Paul E. Hansen, John C. Campbell
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Patent number: 5852148Abstract: Novel mixtures of perfluoroalkyl halides and derivatives thereof are described. These mixtures contain some compounds with a straight perfluoroalkyl group and some with a branched perfluoroalkyl group. Methods of preparation and use are also described.Type: GrantFiled: February 4, 1997Date of Patent: December 22, 1998Assignee: Minnesota Mining & Manufacturing CompanyInventors: Frederick E. Behr, Rudolf J. Dams, Johan E. DeWitte, Donald F. Hagen
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Patent number: 5738790Abstract: A solid phase extraction or chromatographic medium comprises a porous nonwoven fibrous matrix comprising at least one of polytetrafluoroethylene and blown microfibers, and sorptive or reactive hydrophobic siliceous molecular sieve particulates enmeshed in said matrix, the ratio of molecular sieves to matrix being in the range of 40:1 to 1:40.Type: GrantFiled: March 5, 1997Date of Patent: April 14, 1998Assignee: Minnesota Mining and Manufacturing CompanyInventors: Donald F. Hagen, Paul E. Hansen, Craig G. Markell
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Patent number: 5702610Abstract: A sheet article for solid phase extraction or solid phase reaction comprises at least one sorptive polymer pulp, and optionally at least one of sorptive and reactive particulate. The article can be used in a method of separating an analyte from a fluid comprising the step of passing a fluid comprising an analyte through a sheet article comprising poly(p- or m-phenylenephthalamide) pulp, the pulp optionally having incorporated therein solid phase particulates, the sheet article being capable of isolating the analyte from the fluid.Type: GrantFiled: January 9, 1996Date of Patent: December 30, 1997Assignee: Minnesota Mining and Manufacturing CompanyInventors: Donald F. Hagen, Simon S. Fung, Paul E. Hansen
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Patent number: 5700375Abstract: An efficient method removes oxidants from fluids (gases and liquids, particularly air) by means of solid phase extraction or reaction. The solid phase extraction or reaction medium comprises a porous, preferably fibrous, polymeric, membrane or web in which are incorporated oxidant scavenger particulates. Typical oxidants removed in the method include ozone, oxides of nitrogen, halogen, and peroxides. The method of the invention protects organic analytes in analytical applications and removes oxidants in remediation applications by use of oxidant scavenger particles in porous membranes.Type: GrantFiled: April 29, 1996Date of Patent: December 23, 1997Assignee: Minnesota Mining and Manufacturing CompanyInventors: Donald F. Hagen, Kenneth M. Hart, Glenn D. Johnson
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Patent number: 5688370Abstract: A sheet article for solid phase extraction or solid phase reaction has at least one sorptive polymer pulp at least one of sorptive and reactive particulate. The article can be used in a method of separating an analyte from a fluid by passing a fluid containing an analyte through a sheet article containing poly(p- or m-phenylenephthalamide) pulp and solid phase particles.Type: GrantFiled: April 25, 1995Date of Patent: November 18, 1997Assignee: Minnesota Mining and Manufacturing CompanyInventors: Donald F. Hagen, Simon S. Fung, Paul E. Hansen
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Patent number: 5639372Abstract: A solid phase extraction or chromatographic medium comprises a porous nonwoven fibrous matrix comprising at least one of polytetrafluoroethylene and blown microfibers, and sorptive or reactive hydrophobic siliceous molecular sieve particulates enmeshed in said matrix, the ratio of molecular sieves to matrix being in the range of 40:1 to 1:40.Type: GrantFiled: April 1, 1996Date of Patent: June 17, 1997Assignee: Minnesota Mining and Manufacturing CompanyInventors: Donald F. Hagen, Paul E. Hansen, Craig G. Markell
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Patent number: 5635060Abstract: A solid phase extraction or chromatographic medium comprises a porous nonwoven fibrous matrix comprising at least one of polytetrafluoroethylene and blown microfibers, and sorptive or reactive hydrophobic siliceous molecular sieve particulates enmeshed in said matrix, the ratio of molecular sieves to matrix being in the range of 40:1 to 1:40.Type: GrantFiled: April 1, 1996Date of Patent: June 3, 1997Assignee: Minnesota Mining and Manufacturing CompanyInventors: Donald F. Hagen, Paul E. Hansen, Craig G. Markell
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Patent number: 5618438Abstract: A functionalized macroporous poly(styrene divinylbenzene) particle comprises at least one ionic functional group covalently bonded thereto, the functionalized particle having sorptive capability towards an analyte, said functional group being present in the range of 0.1 to 2.5 milliequivalents per gram of poly(styrene divinylbenzene). The functionalized particles can be used in a packed column or enmeshed in a nonwoven web for utility in solid phase extraction applications.Type: GrantFiled: May 23, 1995Date of Patent: April 8, 1997Assignee: Minnesota Mining and Manufacturing CompanyInventors: James S. Fritz, Philip J. Dumont, Donald F. Hagen, Craig G. Markell, Luther W. Schmidt
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Patent number: 5616407Abstract: A functionalized macroporous poly(styrene divinylbenzene) particle comprises at least one ionic functional group covalently bonded thereto, the functionalized particle having sorptive capability towards an analyte, said functional group being present in the range of 0.1 to 2.5 milliequivalents per gram of poly(styrene divinylbenzene). The functionalized particles can be used in a packed column or enmeshed in a nonwoven web for utility in solid phase extraction applications.Type: GrantFiled: May 30, 1995Date of Patent: April 1, 1997Assignee: Minnesota Mining and Manufacturing CompanyInventors: James S. Fritz, Donald F. Hagen, Craig G. Markell
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Patent number: 5595649Abstract: A particle loaded, porous, fibrous compressed or fused article comprises a nonwoven fibrous polymeric web, which preferably is thermoplastic, melt-extrudable, and pressure-fusible blown microfibrous web, and sorptive particles enmeshed in said web, the particle loaded fibrous article has a Gurley number of at least two seconds, and the article is useful in separation science. A method of preparation of the article and method of use is also disclosed.Type: GrantFiled: February 16, 1995Date of Patent: January 21, 1997Assignee: Minnesota Mining and Manufacturing CompanyInventors: Craig G. Markell, Donald F. Hagen, Paul E. Hansen, Nicholas R. Baumann
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Patent number: 5558771Abstract: Composite articles are useful for separating mercury from fluids. The composite articles can be porous supports comprising an inert substrate having immobilized thereon finely divided gold optionally in combination with a tin salt coating. The porous support can be a particulate or porous fibrous webs. Alternatively, the composite articles can comprise a porous fibrous membrane having enmeshed therein the aforementioned porous supports which can be in particulate or fibrous forms. The method for separating elemental, ionic, or organic mercury in fluids comprises the step of contacting and passing a fluid containing mercury through a support comprising a porous, high surface area, inert substrate on which is immobilized finely divided elemental gold at a controlled rate for a time sufficient for the mercury to sorb to the elemental gold and to provide an immobilized gold-mercury amalgam on the support. If a tin salt also is immobilized on the inert substrate, mercury-tin salt can also be formed.Type: GrantFiled: December 4, 1995Date of Patent: September 24, 1996Assignee: Minnesota Mining and Manufacturing CompanyInventors: Donald F. Hagen, Wanda Bahmet, Louis C. Haddad, Robert E. Perkins
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Patent number: 5529686Abstract: A solid phase extraction or chromatographic medium comprises a porous nonwoven fibrous matrix comprising at least one of polytetrafluoroethylene and blown microfibers, and sorptive or reactive hydrophobic siliceous molecular sieve particulates enmeshed in said matrix, the ratio of molecular sieves to matrix being in the range of 40:1 to 1:40.Type: GrantFiled: May 23, 1995Date of Patent: June 25, 1996Assignee: Minnesota Mining and Manufacturing CompanyInventors: Donald F. Hagen, Paul E. Hansen, Craig G. Markell
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Patent number: 5507941Abstract: A method of removing olefinic impurity, such as perfluoroisobutylene, from fluoroperhalocarbon liquid, such as perfluorinated liquid, comprising the step of contacting the fluoroperhalocarbon liquid with a body of particles comprising particles selected from the group consisting of alumina, alkali metal oxide, alkali metal hydroxide, alkaline earth oxide, alkaline earth hydroxide, silicon oxide, tin oxide, zinc oxide, alkaline earth basic carbonate, and alkaline earth basic phosphate, transition metal oxide particles and mixtures thereof.Type: GrantFiled: January 18, 1994Date of Patent: April 16, 1996Assignee: Minnesota Mining and Manufacturing CompanyInventors: Venkateswarlu Pothapragada, Robert B. Fletcher, Donald F. Hagen, Frederick E. Behr
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Patent number: 5492627Abstract: Composite articles are useful for separating mercury from fluids. The composite articles can be porous supports comprising an inert substrate having immobilized thereon finely divided gold optionally in combination with a tin salt coating. The porous support can be a particulate or porous fibrous webs. Alternatively, the composite articles can comprise a porous fibrous membrane having enmeshed therein the aforementioned porous supports which can be in particulate or fibrous forms. The method for separating elemental, ionic, or organic mercury in fluids comprises the step of contacting and passing a fluid containing mercury through a support comprising a porous, high surface area, inert substrate on which is immobilized finely divided elemental gold at a controlled rate for a time sufficient for the mercury to sorb to the elemental gold and to provide an immobilized gold-mercury amalgam on the support. If a tin salt also is immobilized on the inert substrate, mercury-tin salt can also be formed.Type: GrantFiled: June 29, 1994Date of Patent: February 20, 1996Assignee: Minnesota Mining and Manufacturing CompanyInventors: Donald F. Hagen, Wanda Bahmet, Louis C. Haddad, Robert E. Perkins
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Patent number: 5470532Abstract: Composite reactive articles are useful for quantifying cyanide ions in solution. The composite reactive articles can be porous reactive supports comprising an inert substrate having immobilized thereon finely divided gold. The porous reactive supports can be particulate, porous fibrous membranes or solution-cast membranes. Alternatively, the composite reactive articles can comprise porous fibrous membranes having enmeshed therein the aforementioned porous supports which can be in particulate or fibrous forms.Type: GrantFiled: April 6, 1994Date of Patent: November 28, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: Donald F. Hagen, Louis C. Haddad, Robert E. Perkins, Craig G. Markell
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Patent number: 5415779Abstract: A particle loaded, porous, fibrous compressed or fused article comprises a nonwoven fibrous polymeric web, which preferably is thermoplastic, melt-extrudable, and pressure-fusible blown microfibrous web, and sorptive particles enmeshed in said web, the particle loaded fibrous article has a Gurley number of at least two seconds, and the article is useful in separation science. A method of preparation of the article and method of use is also disclosed.Type: GrantFiled: February 17, 1994Date of Patent: May 16, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: Craig G. Markell, Donald F. Hagen, Paul E. Hansen, Nicholas R. Baumann
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Patent number: RE36811Abstract: A method for isolating an environmentally hazardous organic contaminant from a fluid utilizes a solid phase extraction medium comprises a PTFE fibril matrix, and sorptive particles enmeshed in said matrix comprising more than 30 and up to 100 weight percent of porous organic particles, and less than 70 to 0 weight percent of porous (organic-coated or uncoated) inorganic particles, the ratio of sorptive particles to PTFE being in the range of 40:1 to 1:4 by weight. The extraction medium is useful in pesticide, phenolics, and residue of explosives separations. The separations can be efficiently performed in a stacked disk format.Type: GrantFiled: October 24, 1994Date of Patent: August 8, 2000Assignee: Minnesota Mining and Manufacturing Co.Inventors: Craig G. Markell, Donald F. Hagen, James D. Luedtke