Patent US3539298A successfully refreshed from Google Patents.
Patent US3050298A successfully refreshed from Google Patents.
US3050298A
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US
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Calcination means and method
Assignee: Individual
•
Filing: 1960-04-04
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Granted: 1962-08-21
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Expires: 1980-04-04
Abstract
No abstract record available.
Inventors
- 👤 Hall Hubert Lionel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:16
CPC Classifications
F; F27; F27B; F27B9/00; F27B9/14; F27B9/16; F27B9/18; C; C04; C04B; C04B2/00; C04B2/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A PROCESS OF CALCINING LIMESTONE INCLUDING THE STEPS OF DEPOSITING SUBSTANTIALLY UNIFORMLY GRADED PIECES OF LIMESTONE UPON A HEARTH, CONTROLLING THE DEPTH OF THE DEPOSITED MATERIAL TO APPROXIMATELY ONE AND A HALF TIMES THE AVERAGE LIMESTONE PIECE DIAMETER, HEATING THE DEPOSITTED STONE TO A TEMPERATURE OF BETWEEN 1600* F. AND 2800* F. AND THEN REMOVING THE CALCINED MATERIAL FROM THE HEARTH.
Claim 2
Dependent Claim
61 words
A PROCESS OF CALCINING LIMESTONE INCLUDING THE STEPS OF DEPOSITING SUBSTANTIALLY UNIFORMLY GRADED PIECES OF LIMESTONE UPON A HEARTH, CONTROLLING THE DEPTH OF THE DEPOSITED MATERIAL TO APPROXIMATELY ONE AND A HALF TIMES THE AVERAGE LIMESTONE PIECE DIAMETER, HEATING THE DEPOSITTED STONE TO A TEMPERATURE OF BETWEEN 1600* F. AND 2800* F. AND THEN REMOVING THE CALCINED MATERIAL FROM THE HEARTH.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-20 | 1966-02-19 | 1966-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-20 | 1970-02-19 | 1970-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-20 | 1974-02-19 | 1974-08-21 | $7700.00 | Window Closed / Lapsed |