US2926137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter aid from fly ash
Assignee: Individual
•
Filing: 1956-11-30
•
Granted: 1960-02-23
•
Expires: 1976-11-30
Abstract
No abstract record available.
Inventors
- 👤 Calvert Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:59
CPC Classifications
B; B01; B01J; B01J20/00; B01J2220/00; B01J2220/40; B01J2220/48; B01J2220/4875; B01J2220/4887; Y; Y10; Y10S; Y10S264/00; Y10S264/49
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
IN MAKING A FILTER AID, THE PROCESS WHICH COMPRISES MIXING PULVERIZED COAL FLY ASH OF RESIDUAL FUEL CONTENT CORRESPONDING TO LOSS ON IGNITION OF ABOUT 15%-32% WITH AN ADDED ALKALI METAL COMPOUND SERVING AS A FLUX FOR SILICEOUS MATERIAL, IN THE PROPORTION OF 2%-7% OF THE FLUX ON THE WEIGHT OF THE FLY ASH, SUBJECTING THE RESULING MIXTURE TO HEATING AT A TEMPERATURE OF CAKING TOGETHER, OF SOME AT LEAST OF THE PARTICLES OF FLY ASH WITHOUT FORMING A HARD MASS AND WITHIN THE RANGE 1600%-200* F., COOLING THE HEATED PRODUCT, AND SUBJECTING IT TO ANY DISINTEGRATION REQUIRED TO REDUCE THE PRODUCT TO A POWDER OF SIZE OF PARTICLES TO PASS IN PREDOMINATING PROPORTION THROUGH A 60-MESH SCREEN.
Claim 2
Dependent Claim
118 words
IN MAKING A FILTER AID, THE PROCESS WHICH COMPRISES MIXING PULVERIZED COAL FLY ASH OF RESIDUAL FUEL CONTENT CORRESPONDING TO LOSS ON IGNITION OF ABOUT 15%-32% WITH AN ADDED ALKALI METAL COMPOUND SERVING AS A FLUX FOR SILICEOUS MATERIAL, IN THE PROPORTION OF 2%-7% OF THE FLUX ON THE WEIGHT OF THE FLY ASH, SUBJECTING THE RESULING MIXTURE TO HEATING AT A TEMPERATURE OF CAKING TOGETHER, OF SOME AT LEAST OF THE PARTICLES OF FLY ASH WITHOUT FORMING A HARD MASS AND WITHIN THE RANGE 1600%-200* F., COOLING THE HEATED PRODUCT, AND SUBJECTING IT TO ANY DISINTEGRATION REQUIRED TO REDUCE THE PRODUCT TO A POWDER OF SIZE OF PARTICLES TO PASS IN PREDOMINATING PROPORTION THROUGH A 60-MESH SCREEN.
References Cited (Backward Citations)
US110042A
Cited
USRE19166E
Cited
US1198039A
Cited
US1247503A
Cited
US1701272A
Cited
US1904699A
Cited
US2140850A
Cited
GB516645A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-22 | 1963-08-24 | 1964-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-22 | 1967-08-24 | 1968-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-22 | 1971-08-24 | 1972-02-23 | $7700.00 | Window Closed / Lapsed |