Patent US2857240A successfully refreshed from Google Patents.
US2857240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contacting finely divided solids and gasiform materials
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1955-08-08
•
Granted: 1958-10-21
•
Expires: 1975-08-08
Abstract
No abstract record available.
Inventors
- 👤 Ross R Quincy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:41
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/38; B01J8/384; B01J8/388; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/0379; Y10T137/2496; Y10T137/2514; Y10T137/2534; Y10T137/7287; Y10T137/7303
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
IN A SYSTEM WHEREIN FINELY DIVIDED SOLIDS ARE CIRCULATED BETWEEN TWO CONTACTING ZONES THROUGH DEPENDING U-BEND LINES AND A DENSE BED OF SOLIDS IS MAINTAINED IN EACH OF SAID ZONES AND THE LEVEL OF ONE OF SAID FLUIDIZED BEDS IS MAINTAINED AT A SUBSTANTIALLY CONSTANT LEVEL AND THE LEVEL OF SAID OTHER BED IS SUBJECT TO FLUCTUATION, THE IMPROVEMENT WHICH COMPRISES MAINTAINING AN EXTRA SUPPLY OF SOLIDS IN A CONFINED ZONE COMMUNICATING WITH SAID U-BEND LINE LEADING TO SAID BED WHICH IS SUBJECT TO FLUCTUA-
Claim 2
Dependent Claim
85 words
IN A SYSTEM WHEREIN FINELY DIVIDED SOLIDS ARE CIRCULATED BETWEEN TWO CONTACTING ZONES THROUGH DEPENDING U-BEND LINES AND A DENSE BED OF SOLIDS IS MAINTAINED IN EACH OF SAID ZONES AND THE LEVEL OF ONE OF SAID FLUIDIZED BEDS IS MAINTAINED AT A SUBSTANTIALLY CONSTANT LEVEL AND THE LEVEL OF SAID OTHER BED IS SUBJECT TO FLUCTUATION, THE IMPROVEMENT WHICH COMPRISES MAINTAINING AN EXTRA SUPPLY OF SOLIDS IN A CONFINED ZONE COMMUNICATING WITH SAID U-BEND LINE LEADING TO SAID BED WHICH IS SUBJECT TO FLUCTUA-
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) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |