US2635749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst separation
Assignee: Standard Oil Co
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Filing: 1949-09-29
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Granted: 1953-04-21
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Expires: 1969-09-29
Abstract
No abstract record available.
Inventors
- 👤 Wendell P Cropper
- 👤 George E Schmitkons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:28
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/20; B01J8/00; B01J8/18; B01J8/24; B01J8/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
THE PROCESS OF SEPARATING ACTIVE FROM INACTIVE FINELY DIVIDED INORGANIC OXIDE CATALYSTS WHICH COMPRISES MAINTAINING A PULSATING ELECTROSTATIC FIELD AT A PULSATION FREQUENCY OF ABOUT 1 TO 20 CYCLES PER SECOND AND A STRENGTH OF ABOUT 3000 TO 15,000 VOLTS PER CENTIMETER, BELOW ARCHING POTENTIALS, PASSING SAID CATALYST INTO SAID FIELD, EXPELLING ACTIVE CATALYST PARTICLES FROM SAID FIELD AS A RESULT OF CHARGE IMPARTED TO THE ACTIVE CATALYST, SEPARATELY COLLECTING THE MORE ACTIVE EXPELLED CATALYST AND COLLECTING THE LESS ACTIVE CATALYST FRACTION DOWNWARDLY BY GRAVITY FROM SAID FIELD.
Claim 2
Dependent Claim
88 words
THE PROCESS OF SEPARATING ACTIVE FROM INACTIVE FINELY DIVIDED INORGANIC OXIDE CATALYSTS WHICH COMPRISES MAINTAINING A PULSATING ELECTROSTATIC FIELD AT A PULSATION FREQUENCY OF ABOUT 1 TO 20 CYCLES PER SECOND AND A STRENGTH OF ABOUT 3000 TO 15,000 VOLTS PER CENTIMETER, BELOW ARCHING POTENTIALS, PASSING SAID CATALYST INTO SAID FIELD, EXPELLING ACTIVE CATALYST PARTICLES FROM SAID FIELD AS A RESULT OF CHARGE IMPARTED TO THE ACTIVE CATALYST, SEPARATELY COLLECTING THE MORE ACTIVE EXPELLED CATALYST AND COLLECTING THE LESS ACTIVE CATALYST FRACTION DOWNWARDLY BY GRAVITY FROM SAID FIELD.
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) | 1956-04-20 | 1956-10-20 | 1957-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-20 | 1960-10-20 | 1961-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-20 | 1964-10-20 | 1965-04-21 | $7700.00 | Window Closed / Lapsed |