Patent US2550702A successfully refreshed from Google Patents.
Patent US3023231A successfully refreshed from Google Patents.
US3023231A
Expired / Lapsed
US
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Production of calcium petroleum sulfonates
Assignee: Phillips Petroleum Co
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Filing: 1958-11-28
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Granted: 1962-02-27
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Expires: 1978-11-28
Abstract
No abstract record available.
Inventors
- 👤 Richard S Logan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:49
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/42; C07C303/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A PROCESS OF IMPROVING THE SEPARATION OF CALCIUM PETROLEUM SULFONATES FROM A LIME-NEUTRALIZED PETROLEUM MIXTURE CONTAINING CALCIUM SULFATE DIHYDRATE, WHICH COMPRISES HEATING SAID MIXTURE AT A TEMPERATURE IN THE RANGE OF 240 TO 450* F. WHICH MAINTAINING THE LIQUID PHASE THEREOF SO AS TO STABILIZE THE SAME WITH RESPECT TO FERROUS CORROSION, DEHYDRATING THE RESULTING STABILIZED MIXTURE AT A TEMPERATURE IN THE RANGE OF 50 TO 200* F, AND AT A PRESSURE IN THE RANGE OF 0.2 TO 28 INCHES HG ABSOLUTE, AND, SEPARATING SAID CALCIUM PETROLEUM SULFONATES FROM THE RESULTING DEHYDRATED MIXTURE, SAID STEPS OF HEATING AND DEHYDRATING BEING CARRIED OUT AT TEMPERATURES AND PRESSURES SUFFICIENT TO PREVENT THE DEHYDRATION OF SAID CALCIUM SULFATE DIHYDRATE.
Claim 2
Dependent Claim
116 words
A PROCESS OF IMPROVING THE SEPARATION OF CALCIUM PETROLEUM SULFONATES FROM A LIME-NEUTRALIZED PETROLEUM MIXTURE CONTAINING CALCIUM SULFATE DIHYDRATE, WHICH COMPRISES HEATING SAID MIXTURE AT A TEMPERATURE IN THE RANGE OF 240 TO 450* F. WHICH MAINTAINING THE LIQUID PHASE THEREOF SO AS TO STABILIZE THE SAME WITH RESPECT TO FERROUS CORROSION, DEHYDRATING THE RESULTING STABILIZED MIXTURE AT A TEMPERATURE IN THE RANGE OF 50 TO 200* F, AND AT A PRESSURE IN THE RANGE OF 0.2 TO 28 INCHES HG ABSOLUTE, AND, SEPARATING SAID CALCIUM PETROLEUM SULFONATES FROM THE RESULTING DEHYDRATED MIXTURE, SAID STEPS OF HEATING AND DEHYDRATING BEING CARRIED OUT AT TEMPERATURES AND PRESSURES SUFFICIENT TO PREVENT THE DEHYDRATION OF SAID CALCIUM SULFATE DIHYDRATE.
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) | 1965-02-26 | 1965-08-28 | 1966-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-26 | 1969-08-28 | 1970-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-26 | 1973-08-28 | 1974-02-27 | $7700.00 | Window Closed / Lapsed |