Patent FR1595508A successfully refreshed from Google Patents.
Patent US2668140A successfully refreshed from Google Patents.
US2668140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of paraffin waxes
Assignee: Shell Development Co
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Filing: 1950-05-24
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Granted: 1954-02-02
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Expires: 1970-05-24
Abstract
No abstract record available.
Inventors
- 👤 Karekin G Arabian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:12
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/36
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
141 words
THE METHOD OF PRODUCING A HARD, HIGH MELTING, HYDROCARBON WAX PRODUCT AND A PLASTIC, HIGH MELTING, PARAFFIN WAX PRODUCT FROM A DEASPHALTIZED AND SELECTIVE SOLVENT EXTRACTED PARAFFINICNAPHTHENIC SHORT RESIDUE CRUDE WAX WHICH COMPRISES DISSOLVING THE CRUDE WAX IN A DEWAXING SOLVENT AT AN ELEVATED TEMPERATURE, COOLING THE SOLUTION AND SEPARATING THE RESULTING SOLID WAX FROM THE REMAINING SOLUTION AT A TEMPERATURE OF ABOUT 40* TO 60* F., THEREBY RECOVERING A HIGH MELTING, MICROCRYSTALLINE HYDROCARBON WAX, DISSOLVING THE MICROCRYSTALLINE WAX IN A DEWAXING SOLVENT AT AN ELEVATED TEMPERATURE, COOLING THE SOLUTION AND SEPARATING THE RESULTING SOLID WAX FROM THE REMAINING THE SOLUTION AT A TEMPERATURE AT LEAST AS HIGH AS 100* F THEREBY RECOVERING A HIGH MELTING, HARD HYDROCARBON WAX PRODUCT, AND RECOVERING THE REMAINING WAX COMPONENTS FROM THE SOLVENT OF THE SEPARATED SOLUTION, AS A RELATIVELY HIGH MELTING, PLASTIC HYDROCARBON WAX.
Claim 2
Independent Claim
141 words
THE METHOD OF PRODUCING A HARD, HIGH MELTING, HYDROCARBON WAX PRODUCT AND A PLASTIC, HIGH MELTING, PARAFFIN WAX PRODUCT FROM A DEASPHALTIZED AND SELECTIVE SOLVENT EXTRACTED PARAFFINICNAPHTHENIC SHORT RESIDUE CRUDE WAX WHICH COMPRISES DISSOLVING THE CRUDE WAX IN A DEWAXING SOLVENT AT AN ELEVATED TEMPERATURE, COOLING THE SOLUTION AND SEPARATING THE RESULTING SOLID WAX FROM THE REMAINING SOLUTION AT A TEMPERATURE OF ABOUT 40* TO 60* F., THEREBY RECOVERING A HIGH MELTING, MICROCRYSTALLINE HYDROCARBON WAX, DISSOLVING THE MICROCRYSTALLINE WAX IN A DEWAXING SOLVENT AT AN ELEVATED TEMPERATURE, COOLING THE SOLUTION AND SEPARATING THE RESULTING SOLID WAX FROM THE REMAINING THE SOLUTION AT A TEMPERATURE AT LEAST AS HIGH AS 100* F THEREBY RECOVERING A HIGH MELTING, HARD HYDROCARBON WAX PRODUCT, AND RECOVERING THE REMAINING WAX COMPONENTS FROM THE SOLVENT OF THE SEPARATED SOLUTION, AS A RELATIVELY HIGH MELTING, PLASTIC HYDROCARBON WAX.
Claim 3
Dependent Claim
58 words
A HIGH MELTING, PLASTIC, HYDROCARBON WAX PRODUCT HAVING A MELTING POINT OF ABOUR 140* TO ABOUT 145* F. AND COMPRISING PREDOMINANTLY A MIXTURE OF ISOPARAFFINIC AND NAPHTHENIC HYDROCARBONS HAVING MELTING POINTS SUBSTANTIALLY COEXTENSIVE WITH THE RANGE OF FROM ABOUT 117* F. TO ABOUT 160* F. AND CONTAINING ONLY A MINOR PROPORTION, NOT OVER ABOUR 5% OF NORMAL PARAFFINS.
Claim 4
Dependent Claim
58 words
A HIGH MELTING, PLASTIC, HYDROCARBON WAX PRODUCT HAVING A MELTING POINT OF ABOUR 140* TO ABOUT 145* F. AND COMPRISING PREDOMINANTLY A MIXTURE OF ISOPARAFFINIC AND NAPHTHENIC HYDROCARBONS HAVING MELTING POINTS SUBSTANTIALLY COEXTENSIVE WITH THE RANGE OF FROM ABOUT 117* F. TO ABOUT 160* F. AND CONTAINING ONLY A MINOR PROPORTION, NOT OVER ABOUR 5% OF NORMAL PARAFFINS.
References Cited (Backward Citations)
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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) | 1957-02-01 | 1957-08-03 | 1958-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-01 | 1961-08-03 | 1962-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-01 | 1965-08-03 | 1966-02-02 | $7700.00 | Window Closed / Lapsed |