Assignee
HFM INT INC
US·12 granted patents·540 citations·filing 1996–2000
Top patents by PatentIndex Score
12 records- 0197US6013835AMethod and apparatus for preparing purified terephthalic acidHFM INT INC·Filed 1996·Granted Jan 11, 2000·123 cites·28 claims
- 0297US5840968AMethod and apparatus for preparing purified terephthalic acidHFM INT INC·Filed 1997·Granted Nov 24, 1998·114 cites·31 claims
- 0394US5929274AMethod to reduce carboxybenzaldehyde isomers in terephthalic acid or isophthalic acidHFM INT INC·Filed 1998·Granted Jul 27, 1999·73 cites·42 claims
- 0492US6054610AMethod and apparatus for preparing purified terephthalic acid and isophthalic acid from mixed xylenesHFM INT INC·Filed 1998·Granted Apr 25, 2000·60 cites·22 claims
- 0589US5877385AProcess including extractive distillation and/or dehydrogenation to produce styrene from petroleum feedstock including ethyl-benzene/xylene mixturesHFM INT INC·Filed 1996·Granted Mar 2, 1999·60 cites·20 claims
- 0679US5849982ARecovery of styrene from pyrolysis gasoline by extractive distillationHFM INT INC·Filed 1997·Granted Dec 15, 1998·52 cites·16 claims
- 0778US6113866AApparatus for preparing purified terephthalic acidHFM INT INC·Filed 1999·Granted Sep 5, 2000·16 cites·3 claims
- 0869US6375802B1Method of retrofitting existing equipment for an improved aromatics separation processHFM INT INC·Filed 2000·Granted Apr 23, 2002·11 cites·13 claims
- 0969US6005157ACycloparaffin purification from petroleum streamsHFM INT INC·Filed 1998·Granted Dec 21, 1999·12 cites·47 claims
- 1064US5961935AMethod and apparatus for preparing purified terephthalic acidHFM INT INC·Filed 1998·Granted Oct 5, 1999·7 cites·3 claims
- 1160US6180827B1Recovery of acrylic acid from process or waste water streamsHFM INT INC·Filed 1999·Granted Jan 30, 2001·7 cites·31 claims
- 1254US6140534AMethod for purifying isophthalic acid prepared from metaxyleneHFM INT INC·Filed 1999·Granted Oct 31, 2000·5 cites·25 claims
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