Stonehart Associates Inc.
Patent Owner
Stats
- 3 US PATENTS IN FORCE
- 0 US APPLICATIONS PENDING
- Jul 13, 1999 most recent publication
Details
- 3 Issued Patents
- 0 Issued in last 3 years
- 0 Published in last 3 years
- 643 Total Citation Count
- Feb 24, 1992 Earliest Filing
- 19 Expired/Abandoned/Withdrawn Patents
Patent Activity in the Last 10 Years
Technologies
Top Patents (by citation)
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Recent Publications
- No Recent Publications to Display
Recent Patents
Patent #
Title
Filing Date
Issue Date
Intl Class
Expired/Abandoned/Withdrawn Patents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]
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]
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]
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]
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