Inventor · Graz, AT

Hellfried Karpf

15Patents
12h-index
23Co-inventors
74Inventor score

Filing activity: Apr 17, 1987 → Apr 14, 1997

Most-cited inventions

PatentTitleAreaCited byStatus
US5157262A Sensor element for determination of concentration of substances Physics 104 Expired
US5353792A Sensing device Human Necessities 104 Expired
US5039490A Sensor element for determination of concentration of substances Physics 64 Expired
US4755667A Sensor element for determination of concentration of substances Physics 56 Expired
US5779978A Measuring assembly for luminescence analysis Physics 51 Expired
US5372936A Method for detecting biological activities in a specimen Emerging Cross-Sectional Technologies 50 Expired
US5368027A Sensor arrangement for direct or indirect optical determination of physical or chemical properties Human Necessities 44 Expired
US5266486A Method and apparatus for detecting biological activities in a specimen Emerging Cross-Sectional Technologies 26 Expired
US5128019A Device for measuring chemical and physical parameters of a liquid or gaseous medium Physics 17 Expired
US5217875A Method for detecting biological activities in a specimen and a device for implementing the method Emerging Cross-Sectional Technologies 16 Expired
US5351563A One-way measuring element for analyzing gaseous or liquid samples Physics 14 Expired
US5308581A Substance of an optical fluorescence measuring arrangement for measuring the pH of a sample and optical sensor with such an indicator substance Physics 14 Expired
US5228350A Method for analyzing gaseous or liquid samples and a one-way measuring element for use in such a method Physics 11 Expired
US5723340A Optical indicator for determining the activity of an ion in a sample Physics 2 Expired
US6139798A Sensor membrane of an optical sensor Emerging Cross-Sectional Technologies 2 Expired

Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.