US3159431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Uni-directional
Assignee: —
•
Filing: —
•
Granted: 1964-12-01
•
Expires: 1981-12-01
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:27
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/001
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
209 words
IN A PNEUMATIC LIFT FOR ELEVATING A GRANULAR CONTACT MATERIAL IN A STREAM OF LIFT GAS THE IMPROVED METHOD OF CONTROLLING THE LIFT OPERATION WHICH COMPRISES: FLOWING A MAJOR AND MINOR STREAM OF LIFT GAS TOWARD THE BOTTOM OF THE LIFT, MEASURING THE FLOW RATE OF THE MAJOR STREAM, CONVERGING THE STREAMS OF LIFT GAS, PRESSURING THE CONVERGED STREAMS OF GAS, HEATING THE CONVERGED STREAMS OF GAS, SEPARATING THE STREAMS OF GAS AGAIN INTO MAJOR AND MINOR STREAMS, CONTROLLING THE FLOW RATE OF THE SEPARATED MAJOR STREAM OF GAS IN RESPONSE TO SAID FLOW RATE MEASUREMENT, SO AS TO MAINTAIN THE FLOW RATE OF THE MAJOR STREAM OF GAS SUBSTANTLY CONSTANT, INTRODUCING THE MAJOR AND MINOR STREAMS OF LIFT GAS INTO THE LOWER END OF THE LIFT, TO ELEVATE GRANULAR CONTACT MATERIAL, MEASURING THE PRESSURE FLUCTUATION IN THE UPPER PORTION OF THE LIFT, CONVERTING THE PRESSURE FLUCTUATION TO A STEADY SIGNAL PROPORTIONAL TO THE AVERAGE AMPLITUDE OF PRESSURE FLUCTUATION, AND APPLYING THIS STEADY SIGNAL TO CONTROL THE FLOW RATE OF THE MINOR STREAM OF LIFT GAS AS AS TO MAINTAIN THE FLUCTUATION OF PRESSURE IN THE UPPER PORTION OF THE LIFT AT A SUBSTANTIALLY CONSTANT LEVEL WHEREBY MINIMUM ATTRITION OF THE GRANULAR MATERIAL PASSED THROUGH THE LIFT IS OBTAINED.
Claim 2
Dependent Claim
209 words
IN A PNEUMATIC LIFT FOR ELEVATING A GRANULAR CONTACT MATERIAL IN A STREAM OF LIFT GAS THE IMPROVED METHOD OF CONTROLLING THE LIFT OPERATION WHICH COMPRISES: FLOWING A MAJOR AND MINOR STREAM OF LIFT GAS TOWARD THE BOTTOM OF THE LIFT, MEASURING THE FLOW RATE OF THE MAJOR STREAM, CONVERGING THE STREAMS OF LIFT GAS, PRESSURING THE CONVERGED STREAMS OF GAS, HEATING THE CONVERGED STREAMS OF GAS, SEPARATING THE STREAMS OF GAS AGAIN INTO MAJOR AND MINOR STREAMS, CONTROLLING THE FLOW RATE OF THE SEPARATED MAJOR STREAM OF GAS IN RESPONSE TO SAID FLOW RATE MEASUREMENT, SO AS TO MAINTAIN THE FLOW RATE OF THE MAJOR STREAM OF GAS SUBSTANTLY CONSTANT, INTRODUCING THE MAJOR AND MINOR STREAMS OF LIFT GAS INTO THE LOWER END OF THE LIFT, TO ELEVATE GRANULAR CONTACT MATERIAL, MEASURING THE PRESSURE FLUCTUATION IN THE UPPER PORTION OF THE LIFT, CONVERTING THE PRESSURE FLUCTUATION TO A STEADY SIGNAL PROPORTIONAL TO THE AVERAGE AMPLITUDE OF PRESSURE FLUCTUATION, AND APPLYING THIS STEADY SIGNAL TO CONTROL THE FLOW RATE OF THE MINOR STREAM OF LIFT GAS AS AS TO MAINTAIN THE FLUCTUATION OF PRESSURE IN THE UPPER PORTION OF THE LIFT AT A SUBSTANTIALLY CONSTANT LEVEL WHEREBY MINIMUM ATTRITION OF THE GRANULAR MATERIAL PASSED THROUGH THE LIFT IS OBTAINED.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |