Patent US1298218A successfully refreshed from Google Patents.
US3560468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suspension polymerisation of styrene
Assignee: BP PLC
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Filing: 1968-03-05
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Granted: 1971-02-02
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Expires: 1988-03-05
Abstract
Abstract OLEFINICALLY UNSATURATED MONOMERS, PARTICULARLY STYRENE, ARE POLYMERISED IN AQUEOUS SUSPENSION BY A PROCESS WHICH COMPRISES REACTING AN ALKYL HYDROPEROXIDE, E.G., TERT BUTYL HYDROPEROXIDE WITH A HYDROXY ACID OF SULPHUR WHICH POSSESSES REDUCING PROPERTIES OR A SALT OF SUCH AN ACID, E.G., SODIUM FORMALDEHYDE SULPHOXYLATE, IN WATER, SUBSEQUENTLY ADDING A SUSPENDING AGENT, MONOMER AND CATALYST, AND POLYMERISING THE MONOMER.
Inventors
- 👤 James Keith Hambling
- 👤 John Mansel Squire
- 👤 Colin Temple Richards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:37
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/28; C08F4/32; C08F4/38
Claims Analysis
Total Claims: 0
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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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |