Patent US2670274A successfully refreshed from Google Patents.
Patent US3139463A successfully refreshed from Google Patents.
US3139463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of cement
Assignee: Rheinische Kalksteinwerke GmbH
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Filing: 1960-08-17
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Granted: 1964-06-30
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Expires: 1980-08-17
Abstract
No abstract record available.
Inventors
- 👤 Wuhrer Josef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:21
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/36; C04B7/43; C04B7/432
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A PROCESS FOR THE MANUFACTURE OF CEMENT CLINKER IN A ROTARY KILN EMPLOYING FINELY DIVIDED RAW MATERIAL CONTAINING FREE CAUSTIC LIME COMPRISING PREHEATING A MIXTURE OF AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF CLAY, SAND AND BLAST FURNACE SLAG, TOGETHER WITH FREE CASUSTIC LIME, WITH HEATED AIR IMMEDIATELY BEFORE BURNING BY CONTACTING SAID RAW MATERIAL WITH HEATED AIR AND THEREAFTER BURNING THE MATERIAL THUS HEATED IN A ROTARY, KLIN, WHEREIN SAID MEMBER, PRIOR TO THE ADDITION THEREOF TO THE FREE CAUSTIC LIME, IS DRIED BY SUBJECTING SAID MEMBER TO DIRECT HEAT EXCHANGE CONTACT WITH THE HOT COMBUSTION GAS FROM THE ROTAY KILN.
Claim 2
Dependent Claim
105 words
A PROCESS FOR THE MANUFACTURE OF CEMENT CLINKER IN A ROTARY KILN EMPLOYING FINELY DIVIDED RAW MATERIAL CONTAINING FREE CAUSTIC LIME COMPRISING PREHEATING A MIXTURE OF AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF CLAY, SAND AND BLAST FURNACE SLAG, TOGETHER WITH FREE CASUSTIC LIME, WITH HEATED AIR IMMEDIATELY BEFORE BURNING BY CONTACTING SAID RAW MATERIAL WITH HEATED AIR AND THEREAFTER BURNING THE MATERIAL THUS HEATED IN A ROTARY, KLIN, WHEREIN SAID MEMBER, PRIOR TO THE ADDITION THEREOF TO THE FREE CAUSTIC LIME, IS DRIED BY SUBJECTING SAID MEMBER TO DIRECT HEAT EXCHANGE CONTACT WITH THE HOT COMBUSTION GAS FROM THE ROTAY KILN.
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) | 1967-06-30 | 1967-12-30 | 1968-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-30 | 1971-12-30 | 1972-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-30 | 1975-12-30 | 1976-06-30 | $7700.00 | Window Closed / Lapsed |