US3215353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding method for interruptedly and continuously working mills and apparatus for practicing said method
Assignee: Draiswerke GmbH
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Filing: 1963-05-20
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Granted: 1965-11-02
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Expires: 1983-05-20
Abstract
No abstract record available.
Inventors
- 👤 Paul A Goeser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:17
CPC Classifications
B; B02; B02C; B02C17/00; B02C17/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
86 words
GRINDING METHOD EMPLOYING A CONTINUOUSLY OPERATING GRINDING MILL CONTAINING AUXILIARY GRINDING BODIES SUCH AS BALLS, SAID METHOD COMPRISING THE STEPS OF SUPPLYING BY MEANS OF A PUMP AND UNDER PRESSURE MATERIAL TO BE GROUND TO THE CHAMBER OF THE MILL CONTAINING THE AUXILIARY GRINDING BODIES, SUBJECTING THE MATERIAL AND THE AUXILIARY GRINDING BODIES TO THE ACTION OF STIRRING TOOLS WHILE MAINTAINING GREATER THAN ATMOSPHERIC PRESSURE IN THE CHAMBER, AND CONTROLLING BY VALVE MEANS THE QUANTITY OF MATERIAL BEING TREATED AND THEREBY THE PRESSURE IN THE CHAMBER.
Claim 2
Dependent Claim
86 words
GRINDING METHOD EMPLOYING A CONTINUOUSLY OPERATING GRINDING MILL CONTAINING AUXILIARY GRINDING BODIES SUCH AS BALLS, SAID METHOD COMPRISING THE STEPS OF SUPPLYING BY MEANS OF A PUMP AND UNDER PRESSURE MATERIAL TO BE GROUND TO THE CHAMBER OF THE MILL CONTAINING THE AUXILIARY GRINDING BODIES, SUBJECTING THE MATERIAL AND THE AUXILIARY GRINDING BODIES TO THE ACTION OF STIRRING TOOLS WHILE MAINTAINING GREATER THAN ATMOSPHERIC PRESSURE IN THE CHAMBER, AND CONTROLLING BY VALVE MEANS THE QUANTITY OF MATERIAL BEING TREATED AND THEREBY THE PRESSURE IN THE CHAMBER.
Claim 3
Dependent Claim
110 words
GRINDING MILL FOR A CONTINUOUS GRINDING OPERATION COMPRISING A MILLING CHAMBER, MEANS SEALING SAID CHAMBER DURING THE OPERATION OF THE MILL, STIRRING TOOLS MOVABLY MOUNTED IN SAID CHAMBER, AUXILIARY GRINDING BODIES IN SAID CHAMBER MOVABLE BY SAID STIRRING TOOLS, AND A PUMP CONNECTED TO A MATERIAL SUPPLY SOURCE OPERATIVE TO FEED THE MATERIAL TO BE GROUND TO SAID CHAMBER AND TO PLACE SAID MATERIAL AND SAID GRINDING BODY UNDER ATMOSPHERIC PRESSURE, A DISCHARGE APERTURE IN SAID CHAMBER FOR DISCHARGING TREATED MATERIAL FROM SAID CHAMBER WHILE RETAINING THE GRINDING BODIES THEREIN AND MEANS FOR REDUCING AND CONTROLLING THE PRESSURE COMPRISING A CHOKE OR PRESSURE REDUCTION VALVE LOCATED PROXIMATE SAID DISCHARGE APERTURE.
Claim 4
Dependent Claim
110 words
GRINDING MILL FOR A CONTINUOUS GRINDING OPERATION COMPRISING A MILLING CHAMBER, MEANS SEALING SAID CHAMBER DURING THE OPERATION OF THE MILL, STIRRING TOOLS MOVABLY MOUNTED IN SAID CHAMBER, AUXILIARY GRINDING BODIES IN SAID CHAMBER MOVABLE BY SAID STIRRING TOOLS, AND A PUMP CONNECTED TO A MATERIAL SUPPLY SOURCE OPERATIVE TO FEED THE MATERIAL TO BE GROUND TO SAID CHAMBER AND TO PLACE SAID MATERIAL AND SAID GRINDING BODY UNDER ATMOSPHERIC PRESSURE, A DISCHARGE APERTURE IN SAID CHAMBER FOR DISCHARGING TREATED MATERIAL FROM SAID CHAMBER WHILE RETAINING THE GRINDING BODIES THEREIN AND MEANS FOR REDUCING AND CONTROLLING THE PRESSURE COMPRISING A CHOKE OR PRESSURE REDUCTION VALVE LOCATED PROXIMATE SAID DISCHARGE APERTURE.
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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |