Patent US2934328A successfully refreshed from Google Patents.
US2934328A
Expired / Lapsed
US
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Method and an apparatus for calcining of gypsum
Assignee: Individual
•
Filing: 1957-04-18
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Granted: 1960-04-26
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Expires: 1977-04-18
Abstract
No abstract record available.
Inventors
- 👤 Zvejnieks Andrejs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:50
CPC Classifications
C; C04; C04B; C04B11/00; C04B11/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
AN APPARATUS FOR CALCINING GYPSUM, COMPRISING A CONTINUOUS EXTERNALLY HEATED KETTLE TYPE REACTOR WITH MEANS FOR FEEDING IN GYPSUM AT THE BOTTOM OF SAID REACTOR, MEANS FOR PRODUCING HOT COMBUSTION GAS OF DESIRABLE TEMPERATURE, MEANS FOR CONTACTING THE GYPSUM DIRECTLY WITH SAID HOT COMBUSTION GAS IN THE UPPER PART OF THE SAME REACTOR, MEANS FOR MAINTAINING THE GYPSUM IN FULIDIZED STATE IN SAID REACTOR, MEANS FOR WITHDRAWING THE
Claim 2
Independent Claim
68 words
AN APPARATUS FOR CALCINING GYPSUM, COMPRISING A CONTINUOUS EXTERNALLY HEATED KETTLE TYPE REACTOR WITH MEANS FOR FEEDING IN GYPSUM AT THE BOTTOM OF SAID REACTOR, MEANS FOR PRODUCING HOT COMBUSTION GAS OF DESIRABLE TEMPERATURE, MEANS FOR CONTACTING THE GYPSUM DIRECTLY WITH SAID HOT COMBUSTION GAS IN THE UPPER PART OF THE SAME REACTOR, MEANS FOR MAINTAINING THE GYPSUM IN FULIDIZED STATE IN SAID REACTOR, MEANS FOR WITHDRAWING THE
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) | 1963-04-26 | 1963-10-26 | 1964-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-26 | 1967-10-26 | 1968-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-26 | 1971-10-26 | 1972-04-26 | $7700.00 | Window Closed / Lapsed |