US3722867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of calcining limestone
Assignee: Individual
•
Filing: 1971-06-01
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Granted: 1973-03-27
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Expires: 1991-06-01
Abstract
Abstract This invention is concerned with a continuous method of calcinating limestone in a chamber having refractory walls and a refractory hearth movable through said chamber comprising the steps of depositing the limestone in a layer on the hearth, heating the limestone above 1600* F. as the hearth moves through chamber by directing burning gases against the surface of the layer and downwardly into the limestone and against the hearth, evacuating CO2 and other gases released from the limestone and gas combustion from said chamber and removing the limestone from the hearth.
Inventors
- 👤 W Butler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:03
CPC Classifications
C; C04; C04B; C04B2/00; C04B2/02; C04B2/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
81 words
A continuous method of calcinating limestone in a chamber having refractory walls, spaced apart fuel burners and a refractory hearth movable through said chamber as claimed in claim 1, wherein a different portion of the transverse extent of the surface of said layer of limestone in adjacent burner zone is free from impinging burning gases from said fuel burners at any given time whereby to assist the free excape of CO2 and other gases released fRom the limestone and gas combustion.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |