US2569400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkylation of polystyrene using a hydrogen fluoride catalyst
Assignee: Monsanto Chemicals Ltd
•
Filing: 1948-05-27
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Granted: 1951-09-25
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Expires: 1968-05-27
Abstract
No abstract record available.
Inventors
- 👤 Butler John Mann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:19
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A METHOD OF PREPARING ALKYLATED POLYSTYRENE WHICH COMPRISES REACTING POLYSTYRENE WITH A COMPOUND OF THE GROUP CONSISTING OF HYDROCARBON OLEFINS, ALKYL HALIDES, AND UNSATURATED ALIPHATIC ESTERS HAVING A SINGLE OLEFINIC DOUBLE BOND AND CONTAINING ONLY CARBON, HYDROGEN AND OXYGEN IN THE PRESENCE OF HYDROGEN FLUORIDE.
Claim 2
Independent Claim
45 words
A METHOD OF PREPARING ALKYLATED POLYSTYRENE WHICH COMPRISES REACTING POLYSTYRENE WITH A COMPOUND OF THE GROUP CONSISTING OF HYDROCARBON OLEFINS, ALKYL HALIDES, AND UNSATURATED ALIPHATIC ESTERS HAVING A SINGLE OLEFINIC DOUBLE BOND AND CONTAINING ONLY CARBON, HYDROGEN AND OXYGEN IN THE PRESENCE OF HYDROGEN FLUORIDE.
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) | 1954-09-24 | 1955-03-26 | 1955-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-24 | 1959-03-26 | 1959-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-24 | 1963-03-26 | 1963-09-25 | $7700.00 | Window Closed / Lapsed |