Stonehart Associates Inc.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
B01J CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS, COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS 1108
 
  
 
H01M PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY 1153

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5922487 Anode electrocatalyst for fuel cell and process of preparing sameOct 06, 95Jul 13, 99[H01M]
5607785 Polymer electrolyte electrochemical cell and process of preparing sameOct 11, 95Mar 04, 97[H07M]
5225391 Electrocatalyst for anodeFeb 24, 92Jul 06, 93[B01J]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5871552 Process of preparing electrode for solid polymer electrolyte fuel cellExpiredNov 21, 96Feb 16, 99[H01M]
5843519 Process for forming a catalyst layer on an electrode by spray-dryingExpiredOct 16, 95Dec 01, 98[B05D]
5800938 Sandwich-type solid polymer electrolyte fuel cellExpiredDec 04, 95Sep 01, 98[H01M]
5766788 Electrode composition material for polymer electrolyte fuel cell and process of preparing sameExpiredFeb 22, 96Jun 16, 98[H01M]
5728485 Electrode for polymer electrolyte electrochemical cell and process of preparing sameExpiredJun 12, 97Mar 17, 98[H01M]
5593934 Platinum alloy catalystExpiredDec 07, 94Jan 14, 97[B01J]
5539002 Ion exchange resins with decreased resistance to ionic conductivityExpiredApr 20, 94Jul 23, 96[B01J]
5523181 Polymer solid-electrolyte composition and electrochemical cell using the compositionExpiredSep 24, 93Jun 04, 96[H01M]
5480851 Process of preparing catalyst supporting highly dispersed metal particlesExpiredJul 06, 93Jan 02, 96[B01J]
5472799 Solid polymer electrolyte fuel cellExpiredSep 22, 93Dec 05, 95[H01M]
5453332 Electrode structure for fuel cellExpiredSep 22, 93Sep 26, 95[H01M]
5374598 Process of preparing metal supported catalyst having high surface areaExpiredDec 11, 92Dec 20, 94[B01J]
5350727 Process of preparing catalyst supporting highly dispersed platinum particlesExpiredJul 06, 93Sep 27, 94[B01J]
5294232 Process of preparing solid polymer electrolyte type fuel cellExpiredDec 31, 92Mar 15, 94[H01M]
5275998 Process of preparing catalyst supporting highly dispersed metal particlesExpiredDec 03, 92Jan 04, 94[B01J]
5275999 Process of preparing catalyst supporting highly dispersed metal particlesExpiredDec 03, 92Jan 04, 94[B01J]
5246792 Structure of ion exchange membraneExpiredSep 14, 92Sep 21, 93[H01M]
5208207 ElectrocatalystExpiredFeb 26, 92May 04, 93[B01J]
5189005 Electrocatalyst and process of preparing sameExpiredApr 03, 92Feb 23, 93[B01J]

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