Patent US5049445A successfully refreshed from Google Patents.
US3897010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for the milling of granular materials
Assignee: Linde GmbH
•
Filing: 1974-02-07
•
Granted: 1975-07-29
•
Expires: 1994-02-07
Abstract
Abstract In a fluid-energy or jet-milling system in which a gas stream entrains a granular or particulate material in a jet against a surface to further comminute or pulverize the milled material, the operating or carrier gas is compressed prior to introduction into the mill, expands as a jet in the mill chamber and is separated from the comminuted solid matter thereafter. The gas stream is cooled prior to introduction into the fluid-energy mill and subsequent to compression and the material to be milled is precooled by the spent carrier gas.
Inventors
- 👤 Josef Weishaupt
- 👤 Jakob Oberpriller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:31
CPC Classifications
B; B02; B02C; B02C19/00; B02C19/18; B02C19/186; B02C19/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
231 words
A METHOD OF COMMINUTING PIECES OF A MATERIAL COMPRISING THE STEPS OF: A. CONFINING A SUPPLY OF SAID MATERIAL WITH A WALL AND COOLING SAID SUPPLY OF MATERIAL BY HEAT EXCHANGE WITH A GAS THROUGH SAID WALL, B. COMPRESSING SAID GAS AFTER PASSING IT IN HEAT EXCHANGE WITH SAID SUPPLY OF SAID MATERIAL THROUGH SAID WALL C. COOLING THE GAS COMPRESSED IN STEP (B) BY PASSING IT IN HEAT EXCHANGE WITH A RECIRCULATED EXTERNAL COOLANT TO PRODUCE A COLD FLUID, D. EXPANDING A PORTION OF THE COLD FLUID PRODUCED IN STEP (C) AND PASSING THE EXPANDED PORTION OF SAID FLUID THROUGH SAID SUPPLY IN DIRECT CONTACT WITH SAID MATERIAL WHEREBY WATER AND OTHER VAPOR IS ENTRAINED WITH SAID PORTION, E. PASSING THE REMAINDER OF THE COLD FLUID PRODUCED IN STEP (C) IN INDIRECT HEAT EXCHANGE WITH THE GAS COOLING SAID SUPPLY OF MATERIAL IN STEP (A), F. METERING SAID MATERIAL INTO A JET MILL AFTER SAID MATERIAL IS CONTACTED WITH SAID PORTION OF SAID COLD FLUID IN STEP (D), G. PULVERIZING SAID MATERIAL TO A POWDER IN SAID JET MILL BY ENTRAINMENT OF SAID MATERIAL IN THE FLUID PASSED IN INDIRECT HEAT EXCHANGE WITH SAID GAS IN STEP (E) H. SEPARATING THE FLUID USED TO PULVERIZE SAID MATERIAL IN STEP (G) FROM THE RESULTING POWDER AND I. FEEDING THE FLUID SEPARATED IN STEP (H) AS THE GAS EMPLOYED IN STEP (A).
Claim 2
Independent Claim
231 words
A METHOD OF COMMINUTING PIECES OF A MATERIAL COMPRISING THE STEPS OF: A. CONFINING A SUPPLY OF SAID MATERIAL WITH A WALL AND COOLING SAID SUPPLY OF MATERIAL BY HEAT EXCHANGE WITH A GAS THROUGH SAID WALL, B. COMPRESSING SAID GAS AFTER PASSING IT IN HEAT EXCHANGE WITH SAID SUPPLY OF SAID MATERIAL THROUGH SAID WALL C. COOLING THE GAS COMPRESSED IN STEP (B) BY PASSING IT IN HEAT EXCHANGE WITH A RECIRCULATED EXTERNAL COOLANT TO PRODUCE A COLD FLUID, D. EXPANDING A PORTION OF THE COLD FLUID PRODUCED IN STEP (C) AND PASSING THE EXPANDED PORTION OF SAID FLUID THROUGH SAID SUPPLY IN DIRECT CONTACT WITH SAID MATERIAL WHEREBY WATER AND OTHER VAPOR IS ENTRAINED WITH SAID PORTION, E. PASSING THE REMAINDER OF THE COLD FLUID PRODUCED IN STEP (C) IN INDIRECT HEAT EXCHANGE WITH THE GAS COOLING SAID SUPPLY OF MATERIAL IN STEP (A), F. METERING SAID MATERIAL INTO A JET MILL AFTER SAID MATERIAL IS CONTACTED WITH SAID PORTION OF SAID COLD FLUID IN STEP (D), G. PULVERIZING SAID MATERIAL TO A POWDER IN SAID JET MILL BY ENTRAINMENT OF SAID MATERIAL IN THE FLUID PASSED IN INDIRECT HEAT EXCHANGE WITH SAID GAS IN STEP (E) H. SEPARATING THE FLUID USED TO PULVERIZE SAID MATERIAL IN STEP (G) FROM THE RESULTING POWDER AND I. FEEDING THE FLUID SEPARATED IN STEP (H) AS THE GAS EMPLOYED IN STEP (A).
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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |