US3726846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerisation of styrene and similar monomers using a continuously increasing temperature cycle
Assignee: BP PLC
•
Filing: 1970-06-09
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Granted: 1973-04-10
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Expires: 1990-06-09
Abstract
Abstract AN OLEFIN, PARTICULARLY STYRENE, IS POLYMERISED, USING A CONTINUOUSLY PROGRAMMED TEMPERATURE RISE IN THE RANGE 50-150*C. AND AT LEAST THREE INITIATORS HAVING HALF LIVES OF 1-15 HOURS AT 70*C. AND LESS THAN 1 HOUR AT 100*C., 1-15 HOURS AT 100*C. AND 1-4 HOURS AT 115*C., AND GREATER THAN 15 HOURS AT 100*C. AND 0.1 TO 10 HOURS AT 1300*C. THE INVENTION IS PARTICULARLY APPLICABLE TO A SUSPENSION PROCESS.
Inventors
- 👤 J Squire
- 👤 G Gammon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:40
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/28; C08F4/32; C08F4/38; C08F2/00; C08F2/12; C08F2/16; C08F2/18
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |