US3375982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and system for reducing coal losses at pyrite traps of a coal pulverizer
Assignee: RICHARD S LEASE
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Filing: 1966-06-17
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Granted: 1968-04-02
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Expires: 1986-06-17
Abstract
No abstract record available.
Inventors
- 👤 Richard S Lease
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:30
CPC Classifications
B; B02; B02C; B02C15/00; B02C15/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
THE METHOD OF PULVERIZING MATERIAL SUCH AS COAL OR THE LIKE WHICH COMPRISES SUBJECTING IT TO A MILLING MEANS UNDER THE INFLUENCE OF AN AIR STREAM WHICH CARRIES THE LIGHTER PARTICLES TOWARD A DISCHARGE ZONE OF LESSER PRESSURE AND PERMITS THE HEAVIER PARTICLES TO DROP WITH SOME LIGHTER PARTICLES IN A ZONE OF HIGHER PRESSURE, AND RECIRCULATING THE LAST-NAMED LIGHTER PARTICLES FROM THE ZONE OF HIGHER PRESSURE TO THE ZONE OF LOWER PRESSURE AND RETURNING THEM TO THE MILLING MEANS.
Claim 2
Independent Claim
80 words
THE METHOD OF PULVERIZING MATERIAL SUCH AS COAL OR THE LIKE WHICH COMPRISES SUBJECTING IT TO A MILLING MEANS UNDER THE INFLUENCE OF AN AIR STREAM WHICH CARRIES THE LIGHTER PARTICLES TOWARD A DISCHARGE ZONE OF LESSER PRESSURE AND PERMITS THE HEAVIER PARTICLES TO DROP WITH SOME LIGHTER PARTICLES IN A ZONE OF HIGHER PRESSURE, AND RECIRCULATING THE LAST-NAMED LIGHTER PARTICLES FROM THE ZONE OF HIGHER PRESSURE TO THE ZONE OF LOWER PRESSURE AND RETURNING THEM TO THE MILLING MEANS.
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) | 1971-04-02 | 1971-10-02 | 1972-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-02 | 1975-10-02 | 1976-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-02 | 1979-10-02 | 1980-04-02 | $7700.00 | Window Closed / Lapsed |