Patent US2616830A successfully refreshed from Google Patents.
US2616830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refining of petrolatum
Assignee: MW Kellogg Co
•
Filing: 1948-02-20
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Granted: 1952-11-04
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Expires: 1968-02-20
Abstract
No abstract record available.
Inventors
- 👤 Thomas W Pratt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:24
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A METHOD FOR CONTINUOUSLY SEPARATING RESINOUS COLOR BODIES FROM MICRO-CRYSTALLINE PETROLATUM, WHICH INCLUDES THE STRIPS OF: DISSOLVING AS SAID PETROLATUM IN AN ALCOHOL SOLVENT AT A TEMPERATURE NEAR THE NORMAL BOILING POINT OF SAID SOLVENT, SAID ALCOHOL HAVING A BOILING POINT NEAR THE PETROLATUM MELTING POINT OR HIGHER; FLOWING SAID SOLUTION UPWARDLY THROUGH A VERTICALLY EXTENDED CONTACTING ZONE; COOLING SAID SOLUTION AS IT FLOWS UPWARDLY THROUGH SAID ZONE; FLOWING AN AQUEOUS ALKALI SOLUTION DOWNWARDLY THROUGH SAID CONTACTING ZONE IN COUNTER-CURRENT REALTIONSHIP WITH SAID UPFLOWING ALCOHOL-PETROLATUM SOLUTION TO DISSOLVE COLOR BODIES FROM SAID UPFLOWING PHASE INTO A DOWNWARDLY PHASE; CONTINUOUSLY WITHDRAWING SAID UPPER AND LOWER PHASES FROM THE UPPER AND LOWER REGIONS OF SAID CONTACTING ZONE RESPECTIVELY; AND RECOVERING DECOLORIZED PETROLATUM FROM SAID UPPER PHASE.
Claim 2
Independent Claim
124 words
A METHOD FOR CONTINUOUSLY SEPARATING RESINOUS COLOR BODIES FROM MICRO-CRYSTALLINE PETROLATUM, WHICH INCLUDES THE STRIPS OF: DISSOLVING AS SAID PETROLATUM IN AN ALCOHOL SOLVENT AT A TEMPERATURE NEAR THE NORMAL BOILING POINT OF SAID SOLVENT, SAID ALCOHOL HAVING A BOILING POINT NEAR THE PETROLATUM MELTING POINT OR HIGHER; FLOWING SAID SOLUTION UPWARDLY THROUGH A VERTICALLY EXTENDED CONTACTING ZONE; COOLING SAID SOLUTION AS IT FLOWS UPWARDLY THROUGH SAID ZONE; FLOWING AN AQUEOUS ALKALI SOLUTION DOWNWARDLY THROUGH SAID CONTACTING ZONE IN COUNTER-CURRENT REALTIONSHIP WITH SAID UPFLOWING ALCOHOL-PETROLATUM SOLUTION TO DISSOLVE COLOR BODIES FROM SAID UPFLOWING PHASE INTO A DOWNWARDLY PHASE; CONTINUOUSLY WITHDRAWING SAID UPPER AND LOWER PHASES FROM THE UPPER AND LOWER REGIONS OF SAID CONTACTING ZONE RESPECTIVELY; AND RECOVERING DECOLORIZED PETROLATUM FROM SAID UPPER PHASE.
References Cited (Backward Citations)
US1672621A
Cited
FR630220A
Cited
US1796621A
Cited
US1813327A
Cited
US2041308A
Cited
US2309651A
Cited
GB557290A
Cited
US2429727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-04 | 1956-05-05 | 1956-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-04 | 1960-05-05 | 1960-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-04 | 1964-05-05 | 1964-11-04 | $7700.00 | Window Closed / Lapsed |