US2832808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkylation of hydroquinone
Assignee: Monsanto Chemicals Ltd
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Filing: 1955-12-08
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Granted: 1958-04-29
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Expires: 1975-12-08
Abstract
No abstract record available.
Inventors
- 👤 Richard O Zerbe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:39
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/14; C07C37/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
THE IMPROVEMENT IN THE PROCESS OF REPLACING TWO NUCLEAR HYDROGEN ATOMS OF HYDROQUINONE IN THE PRESENCE OF SULFURIC ACID WHICH COMPRISES DISPERSING ONE MOLECULAR PROPORTION OF HYDROQUINONE IN DILUTE SULFURIC ACID WITHIN THE RANGE OF 50%-80% CONCENTRATION AND IN AMOUNT SUFFICIENT TO PROVIDE A FLUID REACTION MEDIUM, THEN ADDING AT REACTION TEMPERATURE BUT BELOW 100*C. AT LEAST TWO MOLECULAR PROPORTIONS OF AN ALKYLATING AGENT SELECTED FROM THE GROUP CONSISTING OF ALCOHOLS AND OLEFINS CONTAINING AT LEAST FOUR BUT LESS THAN SEVEN CARBON ATOMS AND DIALKYLATING ESSENTIALLY ALL OF THE HYDROQUINONE.
Claim 2
Dependent Claim
90 words
THE IMPROVEMENT IN THE PROCESS OF REPLACING TWO NUCLEAR HYDROGEN ATOMS OF HYDROQUINONE IN THE PRESENCE OF SULFURIC ACID WHICH COMPRISES DISPERSING ONE MOLECULAR PROPORTION OF HYDROQUINONE IN DILUTE SULFURIC ACID WITHIN THE RANGE OF 50%-80% CONCENTRATION AND IN AMOUNT SUFFICIENT TO PROVIDE A FLUID REACTION MEDIUM, THEN ADDING AT REACTION TEMPERATURE BUT BELOW 100*C. AT LEAST TWO MOLECULAR PROPORTIONS OF AN ALKYLATING AGENT SELECTED FROM THE GROUP CONSISTING OF ALCOHOLS AND OLEFINS CONTAINING AT LEAST FOUR BUT LESS THAN SEVEN CARBON ATOMS AND DIALKYLATING ESSENTIALLY ALL OF THE HYDROQUINONE.
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) | 1961-04-28 | 1961-10-28 | 1962-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-28 | 1965-10-28 | 1966-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-28 | 1969-10-28 | 1970-04-29 | $7700.00 | Window Closed / Lapsed |