Patent US3586248A successfully refreshed from Google Patents.
US3586248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for grinding and sifting
Assignee: Sulzer Escher Wyss AG
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Filing: 1969-03-10
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Granted: 1971-06-22
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Expires: 1989-03-10
Abstract
Abstract A process for grinding and sifting a granular material, more particularly cement, comprises grinding the charge material stream and thereupon sifting the ground material stream and dividing the latter into a coarse material stream and a fine material stream, and said course material stream into said charge material stream, a closed circuit of coarse material thus being formed, and said fine material stream forming the finished product. According to the invention, a partial stream is taken from said fine material stream and is reintroduced into said closed circuit.
Inventors
- 👤 Rudolf Ruegg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:23
CPC Classifications
B; B02; B02C; B02C17/00; B02C17/18; B02C17/183; B02C17/1835; B02C17/184; B02C17/1845
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
18 words
The process defined in claim 1, in which said partial stream is introduced into said ground material stream.
Claim 2
Dependent Claim
18 words
The process defined in claim 1, in which said partial stream is introduced into said charge material stream.
Claim 3
Dependent Claim
35 words
The process defined in claim 1, in which said partial stream is divided into two partial streams, one of which is introduced into said ground material stream, and the other into said charge material stream.
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |