US3352840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of deposits from polymerization reactors
Assignee: Phillips Petroleum Co
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Filing: 1964-06-24
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Granted: 1967-11-14
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Expires: 1984-06-24
Abstract
No abstract record available.
Inventors
- 👤 Celal M Oktay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:19
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
IN A PROCESS WHEREIN A CONJUGATED ALKADIENE IS CONVERTED TO A CROSS-LINKABLE POLYMER IN THE PRESENCE OF A LITHIUM CATALYST AND POLYMER DEPOSITS HAVING LITHIUM ATOMS DIRECTLY BONDED TO CARBON ATOMS ACCUMULATE ON REACTION ZONE SURFACES CONCOMITANTLY WITH THE CONVERSION, THE IMPROVEMENT WHICH COMPRISES REMOVING SAID DEPOSITS FROM SAID SURFACES BY CONTACTING WITH AN INERT LIQUID HYDROCARBON CONTAINING IMPURITIES SELECTED FROM THE GROUP CONSISTING OF WATER, ORGANIC SULFUR COMPOUNDS, ORGANIC NITROGEN COMPOUNDS AND ORGANIC OXYGEN COMPOUNDS, SAID IMPURITIES BEING PRESENT IN AMOUNTS SUFFICIENT TO INACTIVATE SAID POLYMER DEPOSITS.
Claim 2
Dependent Claim
88 words
IN A PROCESS WHEREIN A CONJUGATED ALKADIENE IS CONVERTED TO A CROSS-LINKABLE POLYMER IN THE PRESENCE OF A LITHIUM CATALYST AND POLYMER DEPOSITS HAVING LITHIUM ATOMS DIRECTLY BONDED TO CARBON ATOMS ACCUMULATE ON REACTION ZONE SURFACES CONCOMITANTLY WITH THE CONVERSION, THE IMPROVEMENT WHICH COMPRISES REMOVING SAID DEPOSITS FROM SAID SURFACES BY CONTACTING WITH AN INERT LIQUID HYDROCARBON CONTAINING IMPURITIES SELECTED FROM THE GROUP CONSISTING OF WATER, ORGANIC SULFUR COMPOUNDS, ORGANIC NITROGEN COMPOUNDS AND ORGANIC OXYGEN COMPOUNDS, SAID IMPURITIES BEING PRESENT IN AMOUNTS SUFFICIENT TO INACTIVATE SAID POLYMER DEPOSITS.
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) | 1970-11-13 | 1971-05-15 | 1971-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-13 | 1975-05-15 | 1975-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-13 | 1979-05-15 | 1979-11-14 | $7700.00 | Window Closed / Lapsed |