CELANESE CORPORATION
Patent Owner
Stats
- 0 US PATENTS IN FORCE
- 0 US APPLICATIONS PENDING
- Nov 27, 1990 most recent publication
Details
- 0 Issued Patents
- 0 Issued in last 3 years
- 0 Published in last 3 years
- 1,161 Total Citation Count
- Dec 05, 1978 Earliest Filing
- 55 Expired/Abandoned/Withdrawn Patents
Patent Activity in the Last 10 Years
Technologies
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Top Patents (by citation)
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Recent Publications
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Recent Patents
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Expired/Abandoned/Withdrawn Patents
Patent #
Title
Status
Filing Date
Issue/Pub Date
Intl Class
4808508 Negative working color proofing process comprising diazo compound and polyvinyl acetal/polyvinyl alcohol/polyvinyl acetate resinExpiredJul 01, 86Feb 28, 89[G03C, G03F]
4786580 Method of developing imaged diazo material with propanol containing developer compositionExpiredDec 27, 83Nov 22, 88[G03C, G03F]
4689371 Process for the preparation of poly (vinylphenol) from poly (acetoxystyrene)ExpiredJul 07, 86Aug 25, 87[C08F]
4678843 Process for the ammonium hydroxide hydrolysis of polymers of acetoxystyrene to polymers of vinylphenolExpiredSep 29, 86Jul 07, 87[C08F]
4666996 Crosslinking of polybenzimidazole polymer with divinyl sulfoneExpiredJan 24, 86May 19, 87[C08G]
4636804 Recording medium comprising a microporous polymer exhibiting enhanced signal to noise ratioExpiredJan 11, 85Jan 13, 87[G01D]
4634530 Chemical modification of preformed polybenzimidazole semipermeable membraneExpiredJul 06, 82Jan 06, 87[B01D]
4541981 Method for preparing a uniform polyolefinic microporous hollow fiberExpiredJun 13, 83Sep 17, 85[B29D]
4480115 Direct hydrogenation of carboxylic acids to alcohol and estersExpiredMar 17, 83Oct 30, 84[C07C]
4463167 Two stage high molecular weight polybenzimidazole production with phosphorus containing catalystExpiredMar 21, 83Jul 31, 84[C08G]
4442058 Esterification of carboxyl end groups employing addition of oxirane compoundsExpiredJul 05, 83Apr 10, 84[D01F]
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