US patents of Carl Oppedahl

5008954 Voice-activated radio transceiver
5228133 Method to perform text search in application programs in computer by selecting a character and scanning the text string to/from the selected character offset position
5860099 Stored program system with protected memory and secure signature extraction
6781509 Alarm reporting system
6789092 Status monitoring system
7069247 Authentication system for mail pieces
7952710 Spectrometric analysis of fluids in-situ
8182636 Electrochemical cell and method of making an electrochemical cell
9960457 System and method for cell-specific control of three-terminal cells
11017184 Runtime-calibratable analog computing system and methods of use