On this page you will find a chronologically ordered overview of patents to whom I contributed.

8	Patent pending "Common detector for combined Raman spectroscopy-optical coherence tomography" C. A. Patil, A. Mahevan-Jansen, T. G. van Leeuwen, and J. Kalkman
7	WO2009/109897 A1 "Photo acoustic sample detector with background compensation" J. Kalkman and H. W. van Kesteren
6	WO2009/001275 A1 "Device for analysing an inflammatory status of a respiratory system" H. W. van Kesteren, T. J. Vink, N. P. Willard, J. Kalkman, and M. Saalmink
5	WO2008/081374 A1, A2, A3 "Reflection or single scattering spectroscopy and imaging" M. M. J. W. van Herpen, J. Kalkman, B. H. W. Hendriks, and S. Stallinga
4	WO2008/056312 A1 "Oscillator element for photo acoustic detector" H. W. van Kesteren, I. F. Helwegen, and J. Kalkman
3	WO2008/026189 A1 and US2009/0249861 A1 "Stable photo acoustic trace gas detector with optical power enhancement cavity" E. M. H. P. van Dijk and J. Kalkman
2	WO2008/026183 A1 "Cavity-enhanced photo acoustic trace gas detector with improved feedback loop" J. Kalkman, M. M. J. W. van Herpen, and H. W. van Kesteren
1	WO2008/026146 A1 "Optical cavity-enhanced photoacoustic trace gas detector with variable light intensity modulator" J. Kalkman and M. M. J. W. van Herpen