Patent US3489728A successfully refreshed from Google Patents.
US3489728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing polymers of 1,2-alkylene sulfides
Assignee: BP Corp North America Inc
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Filing: 1963-03-27
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Granted: 1970-01-13
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Expires: 1983-03-27
Abstract
No abstract record available.
Inventors
- 👤 Frederick E Bailey Jr
- 👤 Haywood G France
- 👤 Leroy R Pennington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:50
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/02; C08G75/06; C08G75/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A PROCESS FOR POLYMERIZING A MONOMERIC 1,2-ALKYLENE SULFIDE, SAID MONOMERIC SULFIDE BEING SELECTED FROM THE GROUP CONSISTING OF ETHYLENE SULFIDE, PROPYLENE SULFIDE, STYRENE SULFIDE AND COMBINATIONS THEREOF, WHICH COMPRISES CONTACTING SAID MONOMERIC SULFIDE WITH A CATALYTIC QUANTITY OF A POLYMERIZATION CATALYST, WHICH IS A DIVALENT METAL AMIDE ALCOHOLATE OF A HYDROXY-CONTAINING ORGANIC COMPOUND HAVING FROM 1 TO 10 CARBON ATOMS, AT A TEMPERATURE OF FROM ABOUT 0*C. TO ABOUT 200*C.
Claim 2
Dependent Claim
70 words
A PROCESS FOR POLYMERIZING A MONOMERIC 1,2-ALKYLENE SULFIDE, SAID MONOMERIC SULFIDE BEING SELECTED FROM THE GROUP CONSISTING OF ETHYLENE SULFIDE, PROPYLENE SULFIDE, STYRENE SULFIDE AND COMBINATIONS THEREOF, WHICH COMPRISES CONTACTING SAID MONOMERIC SULFIDE WITH A CATALYTIC QUANTITY OF A POLYMERIZATION CATALYST, WHICH IS A DIVALENT METAL AMIDE ALCOHOLATE OF A HYDROXY-CONTAINING ORGANIC COMPOUND HAVING FROM 1 TO 10 CARBON ATOMS, AT A TEMPERATURE OF FROM ABOUT 0*C. TO ABOUT 200*C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |