David W Togami, Age 703405 Cardoza Ct, San Jose, CA 95132

6471866, Oct 29, 2002

Nov 2, 2000

09/705084

Douglas T. Gjerde - Saratoga CA
Robert M. Haefele - Campbell CA
David Togami - San Jose CA

Transgenomic, Inc. - San Jose CA

B01D 1508

210635, 210656, 210659, 435 6, 536 254

The invention recognizes the deleterious effects of trace, and even undetectable amounts of multivalent cations on the separation of mixtures of polynucleotides, especially double stranded polynucleotides, and provides an improved method for separating such mixtures on wide pore, non-polar separation media by eliminating multivalent cations from the all aspects of the separation process. This is accomplished by using components in the separation process which are materials which do not release metal cations. In addition, the use of cation capture resins and other methods to remove residual traces of multivalent cations from eluting solvents, sample solutions, separation media, and system components is described. It is also important to remove any traces or organic contaminants from solvents solutions and system parts. Taking similar steps to remove residual traces of multivalent cations and organic impurities from the separation process, the invention may also be used in a batch process to separate mixtures of polynucleotide fragments.

6491821, Dec 10, 2002

Apr 5, 2001

09/828346

Douglas T. Gjerde - Saratoga CA
Robert M. Haefele - Palo Alto CA
David W. Togami - San Jose CA

Transgenomic, Inc. - San Jose CA

B01D 1508

210635, 210656, 2101982, 435 6, 536 254

Improved liquid chromatography systems having components made of titanium, stainless steel, or organic polymeric material are useful in the separation of polynucleotide fragments, particularly large fragments of double-stranded polynucleotides, by Matched Ion Polynucleotide Chromatography (MIPC). The titanium, stainless steel, or polymeric components are treated so that they do not release multivalent cations into aqueous solutions flowing through the chromatography system. Alternatively, or in addition to utilizing materials made of the components listed above, a multivalent cation capture resin placed upstream of the separation column can be employed to remove multivalent ions from the system. The multivalent cation capture resin can be contained in a guard disk, a guard column, or a guard cartridge. Novel methods for separating mixtures of polynucleotide fragments into fractions based on their molecular weight by Matched Ion Polynucleotide Chromatography and slalom chromatography utilize the liquid chromatographic systems described above.

6579459, Jun 17, 2003

Feb 28, 2002

10/086301

Douglas T. Gjerde - Saratoga CA
Robert M. Haefele - Campbell CA
David W. Togami - San Jose CA

Transgenomic, Inc. - Omaha NE

B01D 1508

210635, 210656, 2101982, 435 6, 536 254

Improved liquid chromatography systems having components made of titanium, stainless steel, or organic polymeric material are useful in the separation of polynucleotide fragments, particularly large fragments of double-stranded polynucleotides, by Matched Ion Polynucleotide Chromatography (MIPC). The titanium, stainless steel, or polymeric components are treated so that they do not release multivalent cations into aqueous solutions flowing through the chromatography system. Alternatively, or in addition to utilizing materials made of the components listed above, a multivalent cation capture resin placed upstream of the separation column can be employed to remove multivalent ions from the system. The multivalent cation capture resin can be contained in a guard disk, a guard column, or a guard cartridge. Novel methods for separating mixtures of polynucleotide fragments into fractions based on their molecular weight by Matched Ion Polynucleotide Chromatography and slalom chromatography utilize the liquid chromatographic systems described above.

2002003, Mar 28, 2002

Jan 19, 2001

09/766128

Douglas Gjerde - Saratoga CA, US
Robert Haefele - Campbell CA, US
David Togami - San Jose CA, US

B01D015/08

210/656000, 210/639000, 436/161000

Improved liquid chromatography systems having components made of titanium, stainless steel, or organic polymeric material are useful in the separation of polynucleotide fragments, particularly large fragments of double-stranded polynucleotides, by Matched Ion Polynucleotide Chromatography (MIPC). The titanium, stainless steel, or polymeric components are treated so that they do not release multivalent cations into aqueous solutions flowing through the chromatography system. Alternatively, or in addition to utilizing materials made of the components listed above, a multivalent cation capture resin placed upstream of the separation column can be employed to remove multivalent ions from the system. The multivalent cation capture resin can be contained in a guard disk, a guard column, or a guard cartridge. Novel methods for separating mixtures of polynucleotide fragments into fractions based on their molecular weight by Matched Ion Polynucleotide Chromatography and slalom chromatography utilize the liquid chromatographic systems described above.

2003005, Mar 27, 2003

Oct 28, 2002

10/282855

Douglas Gjerde - Saratoga CA, US
Robert Haefele - Campbell CA, US
David Togami - San Jose CA, US

Transgenomic, Inc. - San Jose CA

B01D015/08

210/635000, 210/656000, 210/659000, 435/006000, 536/025400

The invention recognizes the deleterious effects of trace, and even undetectable amounts of multivalent cations on the separation of mixtures of polynucleotides, especially double stranded polynucleotides, and provides an improved method for separating such mixtures on wide pore, non-polar separation media by eliminating multivalent cations from the all aspects of the separation process. This is accomplished by using components in the separation process which are materials which do not release metal cations. In addition, the use of cation capture resins and other methods to remove residual traces of multivalent cations from eluting solvents, sample solutions, separation media, and system components is described. It is also important to remove any traces or organic contaminants from solvents solutions and system parts. Taking similar steps to remove residual traces of multivalent cations and organic impurities from the separation process, the invention may also be used in a batch process to separate mixtures of polynucleotide fragments.

6030527, Feb 29, 2000

Jul 9, 1999

9/350737

Douglas T. Gjerde - Saratoga CA
Robert M. Haefele - Palo Alto CA
David W. Togami - San Jose CA

Transgenomic, Inc. - San Jose CA

B01D 1508

2101982

Improved liquid chromatography systems having components made of titanium, stainless steel, or organic polymeric material are useful in the separation of polynucleotide fragments, particularly large fragments of double-stranded polynucleotides, by Matched Ion Polynucleotide Chromatography (MIPC). The titanium, stainless steel, or polymeric components are treated so that they do not release multivalent cations into aqueous solutions flowing through the chromatography system. Alternatively, or in addition to utilizing materials made of the components listed above, a multivalent cation capture resin placed upstream of the separation column can be employed to remove multivalent ions from the system. The multivalent cation capture resin can be contained in a guard disk, a guard column, or a guard cartridge. Novel methods for separating mixtures of polynucleotide fragments into fractions based on their molecular weight by Matched Ion Polynucleotide Chromatography and slalom chromatography utilize the liquid chromatographic systems described above.

6156206, Dec 5, 2000

Jun 2, 1999

9/324350

Douglas T. Gjerde - Saratoga CA
Robert M. Haefele - Palo Alto CA
David W. Togami - San Jose CA

Transgenomic, Inc. - San Jose CA

B01D 1508

210635

The invention recognizes the deleterious effects of trace, and even undetectable amounts of multivalent cations on the separation of mixtures of polynucleotides, especially double stranded polynucleotides, and provides an improved method for separating such mixtures on wide pore, non-polar separation media by eliminating multivalent cations from the all aspects of the separation process. This is accomplished by using components in the separation process which are materials which do not release metal cations. In addition, the use of cation capture resins and other methods to remove residual traces of multivalent cations from eluting solvents, sample solutions, separation media, and system components is described. It is also important to remove any traces or organic contaminants from solvents solutions and system parts. Taking similar steps to remove residual traces of multivalent cations and organic impurities from the separation process, the invention may also be used in a batch process to separate mixtures of polynucleotide fragments.

6017457, Jan 25, 2000

May 18, 1998

9/080547

Douglas T. Gjerde - Saratoga CA
Robert M. Haefele - Palo Alto CA
David W. Togami - San Jose CA

Transgenomic, Inc. - San Jose CA

B01D 1508

210635

Improved liquid chromatography systems having components made of titanium, stainless steel, or organic polymeric material are useful in the separation of polynucleotide fragments, particularly large fragments of double-stranded polynucleotides, by Matched Ion Polynucleotide Chromatography (MIPC). The titanium, stainless steel, or polymeric components are treated so that they do not release multivalent cations into aqueous solutions flowing through the chromatography system. Alternatively, or in addition to utilizing materials made of the components listed above, a multivalent cation capture resin placed upstream of the separation column can be employed to remove multivalent ions from the system. The multivalent cation capture resin can be contained in a guard disk, a guard column, or a guard cartridge. Novel methods for separating mixtures of polynucleotide fragments into fractions based on their molecular weight by Matched Ion Polynucleotide Chromatography and slalom chromatography utilize the liquid chromatographic systems described above.