US2598715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of naphthalene isomers
Assignee: Beazer East Inc
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Filing: 1948-12-31
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Granted: 1952-06-03
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Expires: 1968-12-31
Abstract
No abstract record available.
Inventors
- 👤 Joseph E Nickels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:14
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/14875
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A METHOD FOR THE SEPARATION OF THE ALPHA ISOMER FROM A MIXTURE OF ALPHA- AND BETA-ALKYL SUBSTITUTED ISOMERIC NAPHTHALENES IN WHICH THE COMMON SUBSTITUENT ALKYL GROUP IS SELECTED FROM THE GROUP CONSISTING OF PRIMARY AND SECONDARY ALKYL GROUPS HAVING FROM ONE TO FIVE CARBON ATOMS WHICH COMPRISES FORMING A MONO-TERTIARY ALKYL DERIVATIVE OF THE BETA-ISOMER AND A DITERTIARY ALKYL DERIVATIVE OF THE ALPHA ISOMER BY REACTING SAID MIXTURE WITH AN ALKYLATING AGENT CONTAINING A TERTIARY ALKYL GROUP HAVING FROM FOUR TO SIX CARBON ATOMS IN THE GROUP, SAID ALKYLATING AGENT BEING PRESENT IN AN AMOUNT SUFFICIENT TO FURNISH ONE MOLE OF ALKYLATING AGENT PER MOLE OF BETA-ISOMER REACTED AND TWO MOLES OF ALKYLATING AGENT PER MOLE OF ALPHA-ISOMER REACTED, PHYSICALLY SEPARATING FROM THE ALKYLATED MIXTURE THE DI-TERTIARY ALKYL DERIVATIVE OF THE ALPHA ISOMER, AND DEALKYLATING THE DERIVATIVE SO SEPARATED TO PRODUCE THE ALPHA ISOMER.
Claim 2
Independent Claim
144 words
A METHOD FOR THE SEPARATION OF THE ALPHA ISOMER FROM A MIXTURE OF ALPHA- AND BETA-ALKYL SUBSTITUTED ISOMERIC NAPHTHALENES IN WHICH THE COMMON SUBSTITUENT ALKYL GROUP IS SELECTED FROM THE GROUP CONSISTING OF PRIMARY AND SECONDARY ALKYL GROUPS HAVING FROM ONE TO FIVE CARBON ATOMS WHICH COMPRISES FORMING A MONO-TERTIARY ALKYL DERIVATIVE OF THE BETA-ISOMER AND A DITERTIARY ALKYL DERIVATIVE OF THE ALPHA ISOMER BY REACTING SAID MIXTURE WITH AN ALKYLATING AGENT CONTAINING A TERTIARY ALKYL GROUP HAVING FROM FOUR TO SIX CARBON ATOMS IN THE GROUP, SAID ALKYLATING AGENT BEING PRESENT IN AN AMOUNT SUFFICIENT TO FURNISH ONE MOLE OF ALKYLATING AGENT PER MOLE OF BETA-ISOMER REACTED AND TWO MOLES OF ALKYLATING AGENT PER MOLE OF ALPHA-ISOMER REACTED, PHYSICALLY SEPARATING FROM THE ALKYLATED MIXTURE THE DI-TERTIARY ALKYL DERIVATIVE OF THE ALPHA ISOMER, AND DEALKYLATING THE DERIVATIVE SO SEPARATED TO PRODUCE THE ALPHA ISOMER.
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) | 1955-06-03 | 1955-12-03 | 1956-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-03 | 1959-12-03 | 1960-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-03 | 1963-12-03 | 1964-06-03 | $7700.00 | Window Closed / Lapsed |