Patent US2534853A successfully refreshed from Google Patents.
US2534853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cascade catalyst system
Assignee: —
•
Filing: —
•
Granted: 1950-12-19
•
Expires: 1967-12-19
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:01
CPC Classifications
—
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
IN THE PROCESS OF CATALYTIC CONVERSION WHEREIN A GASEOUS REACTANT STREAM IS PASSED UPWARDLY THROUGH A FLUID PHASE, SOLID PARTICLE CATALYST POWDER, COMPRISING A PLURALITY OF DIFFERENT RANGES OF PARTICLE SIZE, AND THE EFFLUENT REACTION PRODUCTS ARE WITHDRAWN FROM CONTACT WITH THE CATALYST, THE STEPS WHICH COMPRISE DISTRIBUTING SAID CATALYST POWDER IN A PLURALITY OF REACTION ZONES SUCH THAT EACH OF SAID ZONES CONTAINS CATALYST HAVING A DIFFERENT, PREDETERMINED RANGE OR PARTICLE SIZE, CONTINUOUSLY PASING REACTANT GAS THROUGH EACH OF SAID REACTION ZONES AT A PREDETERMINED RATE OF LINEAR FLOW AT WHICH CATALYST WITHIN EACH RESPECTIVE RANGE OF PARTICLE SIZE IS ESSENTIALLY RETAINED IN A DENSE FLUID PHASE CONDITION WITHIN ITS REACTION ZONE, WHILE PARTICLES BELOW SAID RESPECTIVE RANGE OF PARTICLE SIZE ARE
Claim 2
Dependent Claim
123 words
IN THE PROCESS OF CATALYTIC CONVERSION WHEREIN A GASEOUS REACTANT STREAM IS PASSED UPWARDLY THROUGH A FLUID PHASE, SOLID PARTICLE CATALYST POWDER, COMPRISING A PLURALITY OF DIFFERENT RANGES OF PARTICLE SIZE, AND THE EFFLUENT REACTION PRODUCTS ARE WITHDRAWN FROM CONTACT WITH THE CATALYST, THE STEPS WHICH COMPRISE DISTRIBUTING SAID CATALYST POWDER IN A PLURALITY OF REACTION ZONES SUCH THAT EACH OF SAID ZONES CONTAINS CATALYST HAVING A DIFFERENT, PREDETERMINED RANGE OR PARTICLE SIZE, CONTINUOUSLY PASING REACTANT GAS THROUGH EACH OF SAID REACTION ZONES AT A PREDETERMINED RATE OF LINEAR FLOW AT WHICH CATALYST WITHIN EACH RESPECTIVE RANGE OF PARTICLE SIZE IS ESSENTIALLY RETAINED IN A DENSE FLUID PHASE CONDITION WITHIN ITS REACTION ZONE, WHILE PARTICLES BELOW SAID RESPECTIVE RANGE OF PARTICLE SIZE ARE
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) | 1953-12-18 | 1954-06-19 | 1954-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-18 | 1958-06-19 | 1958-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-18 | 1962-06-19 | 1962-12-19 | $7700.00 | Window Closed / Lapsed |