Douglas T. Gjerde
102Patents
17h-index
47Co-inventors
86Inventor score
Filing activity: Aug 20, 1979 → May 16, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5338448A | Method of preventing contamination of a chromatography column | Physics | 67 | Expired |
| US6027898A | Chromatographic method for mutation detection using mutation site specifically acting enzymes and chemicals | Chemistry; Metallurgy | 61 | Expired |
| US7488603B2 | Method and device for extracting an analyte | Emerging Cross-Sectional Technologies | 59 | Expired |
| US5772889A | System and method for performing nucleic acid separations using liquid chromatography | Physics | 49 | Expired |
| US6265168A | Apparatus and method for separating and purifying polynucleotides | Performing Operations; Transporting | 40 | Expired |
| US5149661A | Fluid analysis with particulate reagent suspension | Emerging Cross-Sectional Technologies | 33 | Expired |
| US7122640B2 | Open channel solid phase extraction systems and methods | Physics | 29 | Expired |
| US8148168B2 | Method and device for sample preparation | Emerging Cross-Sectional Technologies | 29 | Active |
| US5997742A | Method for performing polynucleotide separations using liquid chromatography | Physics | 26 | Expired |
| US6210885A | Modifying double stranded DNA to enhance separations by matched ion polynucleotide chromatography | Emerging Cross-Sectional Technologies | 25 | Expired |
| US6521411B2 | Method and system for the preparation of cDNA | Chemistry; Metallurgy | 25 | Expired |
| US7482169B2 | Low dead volume extraction column device | Emerging Cross-Sectional Technologies | 24 | Expired |
| US6056877A | Non-polar media for polynucleotide separations | Performing Operations; Transporting | 24 | Expired |
| US6066258A | Polynucleotide separations on polymeric separation media | Chemistry; Metallurgy | 23 | Expired |
| US7151167B2 | Open channel solid phase extraction systems and methods | Physics | 22 | Expired |
| US6372142B1 | Column for DNA separation by matched ion polynucleotide chromatography | Chemistry; Metallurgy | 17 | Expired |
| US5972222A | Process for performing polynucleotide separations | Physics | 17 | Expired |
| US6030527A | Apparatus for performing polynucleotide separations using liquid chromatography | Performing Operations; Transporting | 16 | Expired |
| US5393673A | Method for particulate reagent sample treatment | Emerging Cross-Sectional Technologies | 15 | Expired |
| US6024878A | Method for high resolution liquid chromatographic separation of polynucleotides | Performing Operations; Transporting | 15 | Expired |
| US4272246A | Method and apparatus for chromatographic quantitative analysis | Emerging Cross-Sectional Technologies | 13 | Expired |
| US6017457A | Method for performing polynucleotide separations using liquid chromatography | Physics | 12 | Expired |
| US6174441A | Method for performing polynucleotide separations using liquid chromatography | Physics | 12 | Expired |
| US8362219B2 | Open channel solid phase extraction systems and methods | Physics | 12 | Active |
| US6488855B2 | Non-polar media for polynucleotide separations | Performing Operations; Transporting | 12 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.