| Patents for C07C 273 - Preparation of urea or its derivatives, i.e. compounds containing any of the groups the nitrogen atoms not being part of nitro or nitroso groups (3,705) |
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| 03/16/1983 | EP0074002A1 Process for the preparation of monocyclohexyl urea |
| 02/22/1983 | CA1141872A1 Process for purifying urea-containing waste water and process for preparing melamine |
| 02/09/1983 | EP0071139A2 Simplified process for the preparation of polyamines by alkaline hydrolysis compounds containing NCO groups, and use of these polyamines in the preparation of polyurethanes |
| 02/09/1983 | EP0071096A1 N-aminomethylhalogen acetanilides, method for their manufacture and their use in controlling undesirable plant growth |
| 02/08/1983 | US4372975 Substituted 2-benzoyl-4-chloroglycinanilide derivatives, a process for their production, and their use as medicaments |
| 01/26/1983 | EP0070424A1 Process for the preparation of N,N'-disubstituted 3-amino-propanamides |
| 01/25/1983 | US4370497 Oxidation process using tellurium oxide catalysts |
| 01/19/1983 | EP0070130A1 Improvement in or relating to benzoylphenyl urea derivatives |
| 01/12/1983 | EP0069454A1 Method and apparatus for compressing gas |
| 01/04/1983 | CA1138871A1 Quinazol in-2-ones |
| 12/21/1982 | US4365089 Synthesis of urea |
| 12/15/1982 | EP0066922A1 Process for preparing asymmetric ureas from urethans and amines |
| 12/15/1982 | EP0066906A1 Process for the recovery of valuable components from the waste streams obtained in the preparation of urea |
| 12/01/1982 | EP0065661A2 Surface-active azo compounds and their use |
| 11/30/1982 | CA1136381A1 Catalytic process for the production of urea and ammonium cyanate |
| 11/02/1982 | CA1134854A1 Amine salts of substituted n-phosphonomethylureas and their use as plant growth regulators |
| 10/20/1982 | EP0062823A1 Process for the preparation of aromatic polyisocyanates containing urea groups and/or biuret groups and their use as an isocyanate component in the production of polyurethanes |
| 10/19/1982 | US4355178 By acylation of the corresponding urea |
| 10/12/1982 | US4354040 Thermally efficient |
| 10/12/1982 | US4353709 Granulation process |
| 10/05/1982 | CA1133005A1 Process for the preparation of polyisocyanates containing biuret and/or higher polyuret groups, compounds obtainable by this process and use thereof as synthesis component in the preparation of polyurethane plastics |
| 10/05/1982 | CA1132798A1 Method for reducing the explosiveness of the gases vented fom urea-producing installations |
| 09/22/1982 | EP0060511A1 Process for the preparation of urea |
| 09/21/1982 | US4350700 Analgesic, antiinflammatory, antipyretic |
| 09/08/1982 | EP0059516A1 Process for the removal of urea, ammonia and carbon dioxide from dilute aqueous solutions |
| 08/24/1982 | US4346233 Process for the preparation of ureas |
| 08/24/1982 | US4346111 Alkanolamine derivatives |
| 08/17/1982 | US4345099 Method of selectively removing biuret from urea and compositions for use therein |
| 07/27/1982 | CA1128289A1 Method of hydrolyzing urea contained in waste water streams |
| 07/20/1982 | US4340712 Process for the preparation of polyisocyanates containing biuret and/or higher polyuret groups and use thereof as synthesis component in the preparation of polyurethane plastics |
| 07/13/1982 | CA1127663A1 Treatment of urea solutions |
| 06/16/1982 | EP0053714A1 Solvated salts of 2,4-dinitrophenyl cyanamides, process for preparing them and their application |
| 06/09/1982 | EP0053410A1 Process for the removal of urea, ammonia and carbon dioxide from dilute aqueous solutions |
| 06/08/1982 | US4334096 Process for synthesizing urea |
| 06/01/1982 | CA1124564A1 Black-and-white photographic elements containing a nondiffusible resorcinol coupler and silver halide developing agent |
| 05/26/1982 | EP0018420B1 Method of synthesizing urea |
| 05/25/1982 | CA1124256A1 Process for the preparation of substituted benzoyl-2-chloro-4-glocin-anilide derivatives |
| 05/11/1982 | US4329460 Uracil derivatives and production thereof |
| 05/04/1982 | US4328166 Production of substituted phenylurea |
| 05/04/1982 | US4328165 Penylcarbamic acid chlorides and their preparation |
| 04/28/1982 | EP0050321A2 Novel bicyclooxyphenyl ureas, process for their preparation and pesticides containing them |
| 04/28/1982 | EP0050275A1 Preparation of polyamines |
| 04/27/1982 | US4327068 Method and the reuse of sewage waters of the combined urea-ammonia installations |
| 04/06/1982 | CA1121375A1 Derivatives of amines and amino acids |
| 03/30/1982 | CA1120693A1 Flexible integrated method for the production of ammonia and urea |
| 03/23/1982 | US4321410 Method of stripping unreacted materials in urea synthesis process |
| 03/17/1982 | EP0047556A1 Process for reducing the caking and dusting tendencies of urea granules |
| 03/16/1982 | US4320129 Increasing feed efficiency in ruminant animals |
| 03/16/1982 | US4320103 Flexible integrated method for the production of ammonia and urea |
| 03/16/1982 | US4320068 Process for the production of polyisocyanates having a biuret structure |
| 03/16/1982 | US4320067 Process for the preparation of modified polyisocyanates |
| 03/09/1982 | US4318921 Hypotensive agents; adrenergic blocking agents |
| 03/03/1982 | EP0046711A1 Fluorinated amino-butyric acid and diaminobutane derivatives |
| 02/24/1982 | EP0046195A1 Process and device for separating liquid urea from the waste gas of a melamine synthesis |
| 02/24/1982 | EP0046184A1 Aryloxyalkyl isocyanates and methods for their preparation |
| 02/23/1982 | US4316767 Process for concentrating aqueous urea solutions |
| 02/16/1982 | CA1118185A1 Combined process for the production of urea and ammonia |
| 02/10/1982 | EP0045451A2 Benzodiazepine derivatives, intermediates, their preparation and pharmaceutic preparations containing them |
| 02/09/1982 | US4314924 Thixotropic agent for use in coating compositions |
| 02/09/1982 | CA1117976A1 Simultaneous preparation of 1,3-disubstituted ureas and 1,2-diols |
| 02/02/1982 | US4314077 Method for the production of urea and purification of water |
| 01/19/1982 | US4311856 Process for synthesizing urea |
| 01/12/1982 | US4310692 Reacting urea with amines |
| 12/29/1981 | US4308385 Urea hydrolysis, ammonia and carbon dioxide separation |
| 12/29/1981 | US4308234 Treatment of urea solutions |
| 12/29/1981 | US4308213 Meta-(phenylalkoxy)phenyl-N-methoxy-N-methylurea compounds |
| 12/08/1981 | US4304720 Fluorescent dyes |
| 12/08/1981 | CA1113961A1 Process and apparatus for the removal of ammonium carbamate from a urea-synthesis solution |
| 12/08/1981 | CA1113871A1 Enzymic complexes adapted to convert racemic hydantoins into optically active aminoacids, and their applications |
| 12/01/1981 | CA1113495A1 Process for preparation of urea |
| 11/17/1981 | US4301299 Synthesis of urea |
| 10/27/1981 | US4297373 Cardiovascular disorders; antiarrhythmia agents |
| 10/27/1981 | CA1111446A1 Process for the synthesis of urea |
| 10/20/1981 | US4296252 Urea synthesis process |
| 10/13/1981 | CA1110659A1 Integrated ammonia-urea process |
| 09/29/1981 | US4292255 From polyisocyanates and polyamines, injection nozzle |
| 09/22/1981 | US4291006 Combined process for the production of urea and ammonia |
| 09/09/1981 | EP0035158A1 Process for the preparation of polyisocyanates with a biuret structure |
| 09/01/1981 | US4287207 Used as an analgesic, antipyretic or antiinflammatory agent |
| 08/12/1981 | EP0033458A1 Process for preparing modified polyisocyanates and their use as constituents in preparing polyurethane plastics |
| 08/06/1981 | WO1981002156A1 Process for the preparation of n-aryl-n'-(mono-or disubstiuted)-urea derivatives |
| 08/04/1981 | CA1106405A1 Integrated ammonia-urea producing process, for the production of urea |
| 08/04/1981 | CA1106404A1 Method for the production of urea and purification of water |
| 08/04/1981 | CA1106388A1 Cyclic esters of 3,4-dihydroxy-thiophene-1,1-dioxide compounds and 3,4-dihydroxy-cyclopentadienone compounds |
| 07/07/1981 | US4277416 And electricity from the gasification of coal |
| 06/30/1981 | CA1104132A1 Process for the preparation of therapeutically useful 3,4,5-trimethoxy-benzene derivatives |
| 06/23/1981 | US4275223 Preparation of trans-cyclohexane-1,4-diurethanes |
| 06/16/1981 | US4273767 Combating plant pests with phosphorylated carbamoyl compounds |
| 05/27/1981 | EP0029123A1 Process for the preparation of substituted anilines, and substituted anilines |
| 05/26/1981 | US4269997 Two-steps; ammonia distillation and partial decomposition of ammonium carbamate; decomposition of the bulk of the carbamate and residual ammonia distillation |
| 05/26/1981 | CA1101884A1 Method for the production of urea from pure co.sub.2 and nh.sub.3 |
| 05/26/1981 | CA1101641A1 Urea granulation |
| 05/05/1981 | CA1100522A1 Preparation of trans cyclohexane 1,4 diisocyanate and related compounds |
| 04/28/1981 | US4264519 By reacting with a diamine in an excess of diisocyanate |
| 04/21/1981 | US4263219 Production of substituted phenylurea |
| 03/25/1981 | EP0025692A1 Quinone derivatives, their production and use |
| 03/25/1981 | EP0025548A2 Process for the preparation of alkyl ureas |
| 03/17/1981 | US4256662 Multistage, from ammonia and carbon dioxide |
| 02/24/1981 | US4252804 Tranquilizers, anticonvulsants, muscle relaxants |
| 02/24/1981 | CA1096373A1 Ureido substituted cephalosporin antibiotics |