| 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) |
|---|
| 08/31/1993 | US5241118 Process for the preparation of trisubstituted ureas by reductive carbonylation |
| 08/11/1993 | CN1075139A preparation method of 4, 4'-dinitrosym-diphenylurea |
| 08/04/1993 | CN1074901A Process and apparatus for producing urea with increased yield by stripping with CO2 |
| 07/28/1993 | EP0552626A1 Process for the purification of technical-grade n-alkyl urea |
| 06/30/1993 | CN1073676A Extraction of urea by use of agricultural ammonium bicarbonate |
| 06/29/1993 | US5223635 Preparation of organic compounds using as a reactant an adduct of isocyanic acid and a tertiary amine or an ether |
| 06/29/1993 | US5223238 Method for treating ammonia and urea condensates |
| 06/16/1993 | CN1073152A Process and equipment for hydrolysis of residual urea in processing water of synthesis plant |
| 06/15/1993 | US5220061 Slowyly mixing n,n dialkyl-n-phenylurea and methylene bis/ alkyl carbamate/ with acid catalyst; heating |
| 06/15/1993 | CA1319208C Storage stable polyisocyanates characterized by allophanate linkages |
| 06/02/1993 | EP0544056A1 Process and plant for the production of urea with differentiated yield reaction spaces |
| 06/02/1993 | EP0543891A1 Diphenylurea derivatives |
| 05/26/1993 | CN1020898C Process for separating unconverted raw materials |
| 05/25/1993 | CA1318329C N-(halobenzoyl)-n'-2-halo-4-/1,1,2-trifluoro-2- (trifluoromethoxy)ethoxy/-phenyl-ureas with insecticide activity |
| 05/19/1993 | CN1072174A Processs and plant for production of urea with differentiated yield reaction spaces. |
| 05/15/1993 | CA2082469A1 Process and plant for the production of urea with differentiated yield reaction spaces |
| 05/12/1993 | CN1020599C Process for preparation of acyl ureas |
| 05/04/1993 | CA1317309C N,n'-bis(5-isocyanatonaphthyl) urea, a process for its production, and its use |
| 05/04/1993 | CA1317308C Process for the preparation of biuret polyisocyanates, the compounds obtained by this process and their use |
| 04/28/1993 | EP0538848A1 Process and equipment for the hydrolysis of residual urea in the water from urea synthesis plants |
| 04/27/1993 | US5206412 Reacting alkylphenylcarbamate with methylene bis(alkyl carbamate); acid catlayst |
| 04/24/1993 | CA2081294A1 Process and equipment for the hydrolysis of residual urea in the water from synthesis plants |
| 04/23/1993 | CA2053978A1 Feed supplement for ruminants |
| 04/21/1993 | CN1071160A System and device for increasing yield and production potential of urea reactors |
| 04/06/1993 | CA1315799C Process for the production of polyisocyanates with biuret structures |
| 03/30/1993 | US5198582 From nitrobenzene and aniline |
| 03/18/1993 | DE4130514A1 Prodn. of N,N'-unsymmetrically substituted phenylurea herbicides - by controlled reaction of unsubstituted phenylurea with amine at elevated temp. |
| 03/17/1993 | EP0531689A1 Process for the preparation of pure N,N'-asymmetrically substituted phenylureas |
| 03/17/1993 | EP0375712B1 Process for enhanced urea production |
| 03/17/1993 | CN1069970A United process for synthetic ammonia and urea |
| 03/03/1993 | EP0530087A1 Naphthylethylurea and naphthylethylthiourea compounds, process for their preparation and pharmaceutical compositions containing them |
| 03/02/1993 | US5191083 Unsaturated monomers with pendant carbamate groups, stabilization of synthetic rubbers |
| 03/02/1993 | CA1314054C Process for the preparation of phenyl ureas |
| 02/25/1993 | DE4127562A1 N-mono or N,N-di:substd. urea cpds. prodn. in high yield - comprises reacting ammonium isocyanate with prim. or sec. amine in diluent, without needing to isolate free isocyanic acid |
| 02/24/1993 | CN1069293A System for passivation of metal surfaces affected by operating conditions and agents promoting corrosion |
| 02/09/1993 | US5185139 Removal of particulate matter and trace contaminatnts; separation; liquifying carbon dioxide; distillation |
| 01/05/1993 | US5176800 Process for the modernization of existing urea plants and a modernized urea plant |
| 12/30/1992 | EP0520130A1 Process for preparing symmetric N, N'-disubstituted aromatic urea |
| 12/30/1992 | CN1067425A Energy-saving technology for production of urea |
| 12/16/1992 | CN1067049A Technology for reforming production of urea with full circulation of aqueous solution |
| 12/15/1992 | US5171877 Textile finishes; waterproofing; oil repellants; antisoilants |
| 12/08/1992 | US5169954 Reacting a urea with an alkylating agent; solid base, phase transer catalyst, diluent |
| 12/01/1992 | USRE34137 Method of manufacturing aromatic urethane and intermediate product thereof |
| 12/01/1992 | CA1310953C Process for the preparation of urea derivatives and catalyst system |
| 11/25/1992 | EP0514902A1 Process for scrubbing by means of a liquid the ammonia contained in a vent |
| 11/24/1992 | US5166394 Coupling reagent for peptide synthesis |
| 11/03/1992 | CA1309722C Water soluble or dispersible blocked polyisocyanates and a process for their preparation and use |
| 10/27/1992 | US5159046 Process for the preparation of highly elastic plastics |
| 10/26/1992 | CA2041264A1 Low molecular weight urea-formaldehyde reaction products and process for the preparation thereof |
| 10/21/1992 | CN1065452A Urea production process of high energy efficiency |
| 10/13/1992 | US5155267 Forming unsymmetric carbamates and ureas; reacting primary formamide with dialkyl amine or alcohol |
| 10/13/1992 | US5155253 Reacting vinyl derivative of first Bronsted acid with labile Bronsted acid in presence of ruthenium catalyst, maintaining concentration below certain level and removing product as formed |
| 10/13/1992 | US5155135 Benzamide compounds, their preparation and their use as pesticides |
| 10/13/1992 | US5155127 N-(substituted aryl)-n'-(substituted alkoxy)-ureas and thioureas as antihypercholesterolemic and antiatherosclerotic agents |
| 10/07/1992 | EP0507616A1 Process for the preparation of trisubstituted ureas by reductive carbonylation |
| 10/07/1992 | CN1065060A Process for preparing urea by steps with differentiated yield, and relevant implementations also on existing plants |
| 09/30/1992 | EP0506070A2 Transvinylation process for the preparation of thermally labile vinyl compounds and vinyl compounds prepared from thermally labile acids |
| 09/29/1992 | CA2064376A1 Transvinylation process for the preparation of thermally labile vinyl compounds and vinyl compounds prepared from thermally labile acids |
| 09/23/1992 | EP0504966A1 Urea production process of high energy efficiency |
| 09/23/1992 | EP0504621A1 Method for the passivation of metal surfaces affected by operating conditions and agents promoting corrosion |
| 09/16/1992 | CN1064483A Process and high-yield reactors for synthesis of urea |
| 09/08/1992 | CA1307289C2 Peptidylaminodiols |
| 09/01/1992 | US5143851 Method for separating diphenylurea (dpu) and phenylthiohydantoin-tryptophan (pth-trp) allowing unambiguous identification of trp in automatic sequence analysis |
| 08/26/1992 | CN1063867A Process and plant for producing urea with differentiated yield reaction spaces |
| 08/11/1992 | CA1306257C Substituted ureas, a process for their preparation and their application particularly to ennobling cellulose fibres |
| 08/05/1992 | EP0497215A1 Process and plant for the production of urea with differentiated yield reaction spaces |
| 08/05/1992 | CN1063279A Synthesis method of herbicide isoproturon |
| 07/30/1992 | CA2060274A1 Process and plant for the production of urea with differentiated yield reaction spaces |
| 07/22/1992 | EP0495418A1 System and device for increasing the yield and the production potential of urea reactors |
| 07/22/1992 | EP0495218A1 Process for the preparation of N-mono or N,N-disubstituted ureas |
| 07/21/1992 | US5132325 Benzoylphenylureas the preparation thereof and the use thereof in pest control |
| 07/14/1992 | US5130464 Reaction of aromatic nitro and amine with carbon monoxide in the presence of a catalyst |
| 06/30/1992 | US5126483 Anticholesterol and antilipemic agents |
| 06/30/1992 | CA1304372C Oligomeric benzil ketals and their use as photoinitiators |
| 06/25/1992 | WO1992010468A1 Anti-atherosclerotic aryl compounds |
| 06/23/1992 | US5124451 Process for the n-alkylation or ureas |
| 06/23/1992 | US5124081 Amphiphilic lipid compounds, process for their preparation and their applications especially in cosmetics and dermopharmacy |
| 06/11/1992 | WO1992009566A1 Novel hydroxamic acid and n-hydroxyurea derivatives and their use |
| 06/11/1992 | DE4038905A1 Utilising carbon oxide(s) in flue gas - by feeding with hydrocarbon waste into synthesis gas, fuel gas or other useful gas generator |
| 06/10/1992 | CN1061775A Hydroxamic acid and n-hydroxyurea derivatives and their use |
| 06/03/1992 | EP0487935A1 Process and high-yield reactors for the synthesis of urea |
| 06/03/1992 | CN1061591A Process for producing urea |
| 05/26/1992 | US5116848 N-(((2,6-disubstituted)phenyl)-n-diarylalkyl)ureas as antihyperlipidemic and antiatherosclerotic agents |
| 05/19/1992 | US5114968 Acylated carbamates and use as insecticides |
| 04/08/1992 | EP0479103A1 Process for the production of urea by steps with differentiated yields, and relevant implementations also on existing plants |
| 04/07/1992 | US5103045 Storage-stable biuret polyisocyanates |
| 04/07/1992 | US5103044 Method for purifying linuron |
| 03/31/1992 | US5100635 Multistage, oxidation, reduction, cryogenic distillation, purification |
| 03/25/1992 | CN1059714A Process and devices for avoiding draggings of urea and eliminating formation of fouling substances im vacuum separators of urea plant |
| 03/24/1992 | US5099021 Reaction of an amine and a monosubstituted urea to form a disubstituted urea |
| 03/18/1992 | CN1015883B Process for the hydrolysis of urea in dilute aqueous urea solution |
| 03/17/1992 | US5096599 Process for purifying the effluent from urea production plants |
| 03/12/1992 | DE4028040A1 N-Alkylation of urea cpds. - by reacting urea cpd. with alkylating agent in diluent in presence of phase transfer catalyst and solid base |
| 03/11/1992 | CN1059294A Carbon dioxide production from combustion exhaust gases with nitrogen and argon by-product recovery |
| 03/10/1992 | CA1297227C Process for the production of finely divided polyisocyanates containing urea groups |
| 03/03/1992 | US5093367 Arylureidophenoxymethylpropionic acids which have activity in dissociation of oxygen from hemoglobin |
| 03/03/1992 | CA1296738C Benzoylurea derivative and its production and use |
| 02/26/1992 | EP0471983A1 Process for the N-alkylation of urea |
| 02/25/1992 | US5091571 Reacting aromatic mono-nitro compound, an aromatic primary amine and carbon monoxide in presence of palladium compound catalyst and ammonium or phosphonium co-catlayst |
| 02/25/1992 | US5091553 Reacting adduct of isocyanic acid and tertiary amine with unsaturated compound |