Patents by Inventor Philip E. Flecher

Philip E. Flecher 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).

  • Distributed bragg reflector diode laser for Raman excitation and method for use
    Patent number: 5856869
    Abstract: A distributed Bragg reflector (DBR) diode laser is used as excitation source for fiber optic Raman spectroscopy utilizing charge coupled device (CCD) detection and an image-corrected spectrograph. The DBR diode laser is superior to index guided diode lasers (Fabry-Perot) for elimination of mode hopping, elimination of frequency hysteresis as a function of both temperature and current changes, and reduction in laser broadband emission. These advantages allow the DBR laser to be used in industrial process control applications which are too demanding for index guided diode lasers.
    Type: Grant
    Filed: May 29, 1996
    Date of Patent: January 5, 1999
    Assignee: Ashland Inc
    Inventors: John B Cooper, Philip E. Flecher, William T. Welch