US6124510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1234ze preparation
Assignee: Arkema Inc
•
Filing: 1998-07-21
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Granted: 2000-09-26
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Expires: 2018-07-21
Abstract
Abstract Preparation of cis/trans 1234ze monomer is provided, by dehydrofluorination of 245fa using an alkaline solution or using a gas phase catalyzed process.
Inventors
- 👤 Maher Y. Elsheikh
- 👤 Paul D. Fellenger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:46
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/25
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
45 words
A process for the preparation of cis/trans 1,1,1,3-tetrafluoro-2 -propene which comprises (a) contacting 1,1,1,3,3-pentafluoropropane with an oxygen-containing gas in the presence of a fluorided catalyst selected from Cr 2 O 3 or Cr/Ni/AlF 3 , and (b) recovering cis/trans 1,1,1,3-tetrafluoro-2-propene from the resulting reaction mixture.
Claim 2
Dependent Claim
45 words
A process for the preparation of cis/trans 1,1,1,3-tetrafluoro-2 -propene which comprises (a) contacting 1,1,1,3,3-pentafluoropropane with an oxygen-containing gas in the presence of a fluorided catalyst selected from Cr 2 O 3 or Cr/Ni/AlF 3 , and (b) recovering cis/trans 1,1,1,3-tetrafluoro-2-propene from the resulting reaction mixture.
Claim 3
Dependent Claim
16 words
A process as in claim 1 wherein the catalyst is fluorided Cr 2 O 3 .
Claim 4
Dependent Claim
14 words
A process as in claim 1 wherein the catalyst is fluorided Cr/Ni/AlF 3 .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-09-26 | 2004-03-27 | 2004-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-09-26 | 2008-03-27 | 2008-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-09-26 | 2012-03-27 | 2012-09-26 | $7700.00 | Window Closed / Lapsed |