Stone & Webster Engineering Corp.
Records under this name other than patents Stone & Webster Engineering Corp. holds now: patents now held by others, patents whose terms have ended, and its applications, pending or abandoned.
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| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 6,271,433 | Cat cracker gas plant process for increased olefins recovery Term ended Term ended Feb 22, 2019 · From the USPTO record | Term ended | Term ended Feb 22, 2019 | From the USPTO record |
| US 6,235,961 | Process for pretreating cracked gas before caustic tower treatment in ehtylene plants Formerly held Term ended Term ended Jan 29, 2019 · From the USPTO record | Term ended | Term ended Jan 29, 2019 | From the USPTO record |
| US 6,210,583 | Spent caustic pretreatment and enhanced oxidation process Formerly held Term ended Term ended Dec 17, 2018 · From the USPTO record | Term ended | Term ended Dec 17, 2018 | From the USPTO record |
| US 6,395,952 | Chemical absorption process for recovering olefins from cracked gases Formerly held Term ended Term ended Aug 8, 2018 · From the USPTO record | Term ended | Term ended Aug 8, 2018 | From the USPTO record |
| US 6,267,359 | Advanced tray support system using orthogonal grillage Formerly held Term ended Term ended Jul 31, 2018 · From the USPTO record | Term ended | Term ended Jul 31, 2018 | From the USPTO record |
| US 6,528,027 | Cracking furance having radiant heating tubes the inlet and outlet legs of which are paired within the firebox Formerly held Term ended Term ended May 12, 2018 · From the USPTO record | Term ended | Term ended May 12, 2018 | From the USPTO record |
| US 6,312,652 | Ceramic dip pipe and tube reactor for ethylene production Formerly held Term ended Term ended Sep 19, 2017 · From the USPTO record | Term ended | Term ended Sep 19, 2017 | From the USPTO record |
| US 6,383,455 | Ceramic slot reactor for ethylene production Formerly held Term ended Term ended Sep 19, 2017 · From the USPTO record | Term ended | Term ended Sep 19, 2017 | From the USPTO record |
| US 6,482,312 | Particulate solids cracking apparatus and process Formerly held Lapsed on the fee record Ended Nov 19, 2010 · From the USPTO record | Lapsed on the fee record | Ended Nov 19, 2010 | From the USPTO record |
| US 6,297,414 | Deep selective hydrogenation process Formerly held Lapsed on the fee record Ended Oct 2, 2009 · From the USPTO record | Lapsed on the fee record | Ended Oct 2, 2009 | From the USPTO record |