US2671111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of styrene derivatives
Assignee: Monsanto Chemicals Ltd
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Filing: 1950-04-08
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Granted: 1954-03-02
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Expires: 1970-04-08
Abstract
No abstract record available.
Inventors
- 👤 Butler John Mann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:00
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/61; C07C45/65; C07C45/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
20 words
THE PROCESS OF PREPARING P-ACETYL-A-METHYLSTYRENE IN WHICH P-ACETYL-A,A-DIMETHYLBENZYL ALCOHOL IS HEATED AT AN ELECATYED TEMPERATURE WITH AN ACIDIC DEHYDRATING AGENT.
Claim 2
Dependent Claim
20 words
THE PROCESS OF PREPARING P-ACETYL-A-METHYLSTYRENE IN WHICH P-ACETYL-A,A-DIMETHYLBENZYL ALCOHOL IS HEATED AT AN ELECATYED TEMPERATURE WITH AN ACIDIC DEHYDRATING AGENT.
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) | 1957-03-01 | 1957-08-31 | 1958-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-01 | 1961-08-31 | 1962-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-01 | 1965-08-31 | 1966-03-02 | $7700.00 | Window Closed / Lapsed |