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                        3725434
                    
                                            
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                                    Patent number 3,725,434
                                
 
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                                    Issue date Apr 3, 1973
                                
 
                        
                                                                
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                                    C07 - ORGANIC CHEMISTRY
                                 
                        
                 
             
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                        3644278
                    
                                            
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                                    Patent number 3,644,278
                                
 
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                                    Issue date Feb 22, 1972
                                
 
                        
                                                                
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                                    C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
                                 
                        
                 
             
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                        3632613
                    
                                            
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                                    Patent number 3,632,613
                                
 
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                                    Issue date Jan 4, 1972
                                
 
                        
                                                                
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                                    C07 - ORGANIC CHEMISTRY
                                 
                        
                 
             
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                        3367864
                    
                                            
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                                    Patent number 3,367,864
                                
 
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                                    Issue date Feb 6, 1968
                                
 
                        
                                                                
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                                    C07 - ORGANIC CHEMISTRY
                                 
                        
                 
             
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                        2117207
                    
                                            
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                                    Patent number 2,117,207
                                
 
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                                    Issue date May 10, 1938
                                
 
                        
                                                                
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                                    C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
                                 
                        
                 
             
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                        2008649
                    
                                            
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                                    Patent number 2,008,649
                                
 
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                                    Issue date Jul 16, 1935
                                
 
                        
                                                                
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                                    C07 - ORGANIC CHEMISTRY
                                 
                        
                 
             
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                        1924698
                    
                                            
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                                    Patent number 1,924,698
                                
 
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                                    Issue date Aug 29, 1933
                                
 
                        
                                                                
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                                    C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
                                 
                        
                 
             
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                        1737458
                    
                                            
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                                    Patent number 1,737,458
                                
 
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                                    Issue date Nov 26, 1929
                                
 
                        
                                                                
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                                    C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...