University of California

Technicon Instruments Corporation

Miles Inc.

Roger C Helgeson

Koon-Wah Leong

Bronislaw P Czech

Eddy Chapoteau

Anand Kumar

Carl R Gebauer

Donald J Cram

The present invention resides in the discovery of a new class of compounds defined herein as 'chromogenic hemispherands' useful for the measurement of ions, in particular, ions in aqueous solution, which have the structure ##STR1## wherein: R, same or different, is hydrogen, lower alkyl, lower alkylidene, lower alkenyl, allyl or aryl;

Chromogenic hemispherands and their preparation

The present invention resides in the discovery of a new class of compounds defined herein as 'chromogenic cryptahemispherands' useful for the measurement of ions, in particular, ions in aqueous solution, which have the structure ##STR1## wherein: R, same or different, is hydrogen, lower alkyl, lower alkylidene, lower alkenyl, allyl or aryl;

Chromogenic cryptahemispherands and their preparation

The present invention resides in the discovery of a new class of compounds defined herein as 'chromogenic hemispherands' useful for the measurement of ions, in particular, ions in aqueous solution, methods of using the chromogenic hemispherands and test devices containing the chromogenic hemispherands. The chromogenic hemispherands of the invention have the structure ##STR1## wherein: R, same or different, is hydrogen, lower alkyl, lower alkylidene, lower alkenyl, allyl or aryl;

Method of detecting electrolytes in an aqueous test sample using

The present invention resides in the discovery of a class of compounds defined herein as 'chromogenic cryptahemispherands' useful for the measurement of ions, in particular, ions in aqueous solution, which have the structure ##STR1## wherein: R, same or different, is hydrogen, lower alkyl, lower alkylidene, lower alkenyl, allyl or aryl;

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Canuga Park, CA, United States of America

Roger C Helgeson