US3173960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of high melting dimethyl naphthalenes
Assignee: Sunoco Inc
•
Filing: 1962-11-29
•
Granted: 1965-03-16
•
Expires: 1982-11-29
Abstract
No abstract record available.
Inventors
- 👤 William M Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:06
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
112 words
PROCESS FOR CONCENTRATING HIGHER MELTING DIMETHYL NAPHTHALENE FROM AROMATIC HYDROCARBON MIXTURES CONTAINING THE SAME WHICH COMPRISES: DISSOLVING SUCH HYDROCARBON MIXTURE IN A SOLVENT; SAID SOLVENT BEING CAPABLE OF DISSOLVING AT LEAST ONE GRAM PER 10 ML. SOLVENT AT 25*C. OF AROMATIC HYDROCARBONS BOILING IN THE RANGE OF 495*F. TO 510*F.; COOLING THE SOLUTION TO A TEMPERATURE IN THE APPROXIMATE RANGE FROM 0*C. TO MINUS 60*C.; SEPARATING CYRSTALS FROM THE COOLED SOLUTION; HEATING THE CRYSTALS TO A TEMPERATURE IN THE APPROXIMATE RANGE FROM 5*C. TO 50*C. AND BELOW THE MELTING POINT OF THE HIGHST MELTING COMPONENT OF SAID CRYSTALS N ORDER TO MELT A PORTION THEREOF; AND SEPARATING LOWER-MELTING HYDROCARBONS FROMTHE HEATED CRYSTALS.
Claim 2
Dependent Claim
112 words
PROCESS FOR CONCENTRATING HIGHER MELTING DIMETHYL NAPHTHALENE FROM AROMATIC HYDROCARBON MIXTURES CONTAINING THE SAME WHICH COMPRISES: DISSOLVING SUCH HYDROCARBON MIXTURE IN A SOLVENT; SAID SOLVENT BEING CAPABLE OF DISSOLVING AT LEAST ONE GRAM PER 10 ML. SOLVENT AT 25*C. OF AROMATIC HYDROCARBONS BOILING IN THE RANGE OF 495*F. TO 510*F.; COOLING THE SOLUTION TO A TEMPERATURE IN THE APPROXIMATE RANGE FROM 0*C. TO MINUS 60*C.; SEPARATING CYRSTALS FROM THE COOLED SOLUTION; HEATING THE CRYSTALS TO A TEMPERATURE IN THE APPROXIMATE RANGE FROM 5*C. TO 50*C. AND BELOW THE MELTING POINT OF THE HIGHST MELTING COMPONENT OF SAID CRYSTALS N ORDER TO MELT A PORTION THEREOF; AND SEPARATING LOWER-MELTING HYDROCARBONS FROMTHE HEATED CRYSTALS.
Claim 3
Dependent Claim
93 words
PROCESS FOR RECOVERING HIGHER MELTING DIMETHYL NAPHTHALENE FROM AROMATIC HYDROCARBON MIXTURES CONTAINING THE SAME WHICH COMPRISES: DISSOLVING SUCH HYDROCARBON MIXTURE IN A SOLVENT; SAID SOLVENT BEING CAPABLE OF DISSOLVING AT LEAST ONE GRAM PER 10 ML. SOLVENT AT 25*C. OF AROMATIC HYDROCARBONS BOILING IN THE RANGE OF 495*F. TO 510*F.; COOLING THE SOLUTION TO A TEMPERATURE IN THE APPROXIMATE RANGE FROM 0*C. TO MINUS 60*C.; SEPARATING CRYSTALS FROM THE COOLED SOLUTION; HEATING THE CRYSTALS TO A TEMPERATURE IN THE APPORXIMATE RANGE FROM 5*C. TO 50*C. IN ORDER TO MELT A PORTION THEREOF; SEPA-
Claim 4
Dependent Claim
93 words
PROCESS FOR RECOVERING HIGHER MELTING DIMETHYL NAPHTHALENE FROM AROMATIC HYDROCARBON MIXTURES CONTAINING THE SAME WHICH COMPRISES: DISSOLVING SUCH HYDROCARBON MIXTURE IN A SOLVENT; SAID SOLVENT BEING CAPABLE OF DISSOLVING AT LEAST ONE GRAM PER 10 ML. SOLVENT AT 25*C. OF AROMATIC HYDROCARBONS BOILING IN THE RANGE OF 495*F. TO 510*F.; COOLING THE SOLUTION TO A TEMPERATURE IN THE APPROXIMATE RANGE FROM 0*C. TO MINUS 60*C.; SEPARATING CRYSTALS FROM THE COOLED SOLUTION; HEATING THE CRYSTALS TO A TEMPERATURE IN THE APPORXIMATE RANGE FROM 5*C. TO 50*C. IN ORDER TO MELT A PORTION THEREOF; SEPA-
References Cited (Backward Citations)
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US2777889A
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US2766309A
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US2858348A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-15 | 1968-09-14 | 1969-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-15 | 1972-09-14 | 1973-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-15 | 1976-09-14 | 1977-03-16 | $7700.00 | Window Closed / Lapsed |