US3236509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for continuous calcining of powdered gypsum rock
Assignee: BPB Ltd
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Filing: 1962-09-17
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Granted: 1966-02-22
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Expires: 1982-09-17
Abstract
No abstract record available.
Inventors
- 👤 Robert C Blair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:15
CPC Classifications
C; C04; C04B; C04B11/00; C04B11/02; C04B11/028; C04B11/0281; B; B01; B01J; B01J6/00; B01J6/001; B01J6/004; C01; C01F; C01F11/00; C01F11/46; C01F11/466
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
THE PROCESS OF CALCING A MASS OF FLUIDISABLE AND POWDERED CALCIUM SUBSTANCE WHICH COMPRISES INITIALLY CHARGING A CALCINING KETTLE WITH SAID SUBSTANCE, HEATING SAME TO THE REQUIRED CALCING AND FLUIDISING TEMPERATURE WHILE IN SAID KETTLE, MAINTAINING SAID TEMPERATURE WITHIN LIMITS AND THEN, WHEN SAID SUBSTANCE IS COMPLETELY CALCINED, ADDING A SUBSTANTIALLY CONTINUOUS STREAM OF SAID POWDERED SUBSTANCE TO THE UPPER STRATA OF SAID MASS, AND CAUSING SAID CALCINED SUBSTANCE TO PASS SUBSTANTIALLY CONTINUOUSLY FROM THE BOTTOM OF THE KETTLE AS AND TO THE EXTENT THAT THE SAID ADDED SUBSTANCE BECOMES FLUIDISED AND CALCINED BY HEAT TRANSFER THERETO FROM SAID INITIAL CHARGE, BY UPWARD DISPLACEMENT DUE TO THE HEAD OF MATERIAL IN THE KETTLE.
Claim 2
Dependent Claim
113 words
THE PROCESS OF CALCING A MASS OF FLUIDISABLE AND POWDERED CALCIUM SUBSTANCE WHICH COMPRISES INITIALLY CHARGING A CALCINING KETTLE WITH SAID SUBSTANCE, HEATING SAME TO THE REQUIRED CALCING AND FLUIDISING TEMPERATURE WHILE IN SAID KETTLE, MAINTAINING SAID TEMPERATURE WITHIN LIMITS AND THEN, WHEN SAID SUBSTANCE IS COMPLETELY CALCINED, ADDING A SUBSTANTIALLY CONTINUOUS STREAM OF SAID POWDERED SUBSTANCE TO THE UPPER STRATA OF SAID MASS, AND CAUSING SAID CALCINED SUBSTANCE TO PASS SUBSTANTIALLY CONTINUOUSLY FROM THE BOTTOM OF THE KETTLE AS AND TO THE EXTENT THAT THE SAID ADDED SUBSTANCE BECOMES FLUIDISED AND CALCINED BY HEAT TRANSFER THERETO FROM SAID INITIAL CHARGE, BY UPWARD DISPLACEMENT DUE TO THE HEAD OF MATERIAL IN THE KETTLE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |