US3152985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Utilization of bark fly ash and like materials
Assignee: West Virginia Pulp and Paper Co
•
Filing: 1960-09-19
•
Granted: 1964-10-13
•
Expires: 1980-09-19
Abstract
No abstract record available.
Inventors
- 👤 Robert W Stoertz
- 👤 William B Goodwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:26
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/30; C01B32/312; C01B32/336; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/916
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
THE METHOD OF REMOVING COLOR BODIES FROM A FLUID WHICH COMPRISES CONTACTING THE FLUID WITH PARTICLES OF FLY ASH OBTAINED FROM THE BURNING OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF BAR, PINE CONEES, PINE NEEDLES AND MIXTURES THEEOF WITH AIR AT A TEMPERATURE ABOVE 1500* F., SAID PARTICLES OF FLY ASH HAVING BEEN SUBJECTED TO THE ACTION OF AN ACTIVATING GAS SELECTED FROM THE GROUP CONSISTING OF AIR AT 900-1000*F., STEAM AT 1400-1800*F., CARBON DIOXIDE AT 1400-1800*F., AND MIXTURES OF STEAM, AIR, AND CAROBN DIOXIDE AT 1400-1800*F.
Claim 2
Independent Claim
89 words
THE METHOD OF REMOVING COLOR BODIES FROM A FLUID WHICH COMPRISES CONTACTING THE FLUID WITH PARTICLES OF FLY ASH OBTAINED FROM THE BURNING OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF BAR, PINE CONEES, PINE NEEDLES AND MIXTURES THEEOF WITH AIR AT A TEMPERATURE ABOVE 1500* F., SAID PARTICLES OF FLY ASH HAVING BEEN SUBJECTED TO THE ACTION OF AN ACTIVATING GAS SELECTED FROM THE GROUP CONSISTING OF AIR AT 900-1000*F., STEAM AT 1400-1800*F., CARBON DIOXIDE AT 1400-1800*F., AND MIXTURES OF STEAM, AIR, AND CAROBN DIOXIDE AT 1400-1800*F.
References Cited (Backward Citations)
US1641053A
Cited
US2632738A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-10-13 | 1968-04-13 | 1968-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-13 | 1972-04-13 | 1972-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-13 | 1976-04-13 | 1976-10-13 | $7700.00 | Window Closed / Lapsed |