Roger C. Helgeson

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Canuga Park, CA, US

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Patents Grantslast 30 patents

Information Patent Grant
Chromogenic hemispherands and their preparation
- Patent number 5,177,221
- Issue date Jan 5, 1993
- Miles Inc.
- Donald J. Cram
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Chromogenic cryptahemispherands and their preparation
- Patent number 5,011,924
- Issue date Apr 30, 1991
- Technicon Instruments Corporation
- Donald J. Cram
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Method of detecting electrolytes in an aqueous test sample using ch...
- Patent number 4,992,381
- Issue date Feb 12, 1991
- Technicon Instruments Corporation
- Donald J. Cram
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Method for detecting cations in a test sample utilizing chromogenic...
- Patent number 4,859,606
- Issue date Aug 22, 1989
- Technicon Instruments Corporation
- Donald J. Cram
- C07 - ORGANIC CHEMISTRY