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| Patents for C07D 257 - Heterocyclic compounds containing rings having four nitrogen atoms as the only ring hetero atoms (9,612) |
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| 06/08/1976 | US3961963 Multilayer photographic material | | 05/25/1976 | US3959261 Diuretics, saluretics | | 05/25/1976 | US3958993 Sulfur containing organic compound | | 04/27/1976 | US3953466 Tetrazoyl derivatives of prostaglandins | | 03/09/1976 | US3943126 Process for acylating a 7-aminocephalosporin | | 02/17/1976 | US3939173 Substituted carbonyl compounds | | 02/17/1976 | US3939148 Process for preparing 1,3,5,7-tetranitro-1,3,5,7-tetraazacyclooctane | | 02/17/1976 | US3938996 Process for developing light-sensitive silver halide photographic materials | | 01/20/1976 | US3933808 Antibiotics | | 01/13/1976 | US3932441 Process for the production of pure tetrazole-1-acetic acid | | 01/13/1976 | US3932440 Microbiocide | | 01/13/1976 | US3932389 Antiulcer agents |
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