US4502641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid energy mill with differential pressure means
Assignee: EIDP Inc
•
Filing: 1981-04-29
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Granted: 1985-03-05
•
Expires: 2001-04-29
Abstract
Abstract A fluid energy mill of the confined vortex type for comminuting pulverulent solids, said mill provided with means for measuring the differential pressure between the discharge and the feed of the mill through openings in the chamber peripheral wall and in the discharge means, each opening provided with means for purging into the mill to prevent pluggage thereof and a process for using the mill to grind solid TiO 2 by maintaining a constant differential pressure between 100-600 inches of water.
Inventors
- 👤 Anthony J. Coombe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:28
CPC Classifications
B; B02; B02C; B02C19/00; B02C19/06; B02C19/061
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
144 words
In a fluid energy mill of the confined vortex type for comminuting pulverulent solids having in combination a disc-shaped chamber defined by a pair of opposing circular-shaped axial walls and a peripheral wall, a multiplicity of inlets extending through the peripheral wall and aligned for directing gaseous fluid into the chamber tangentially to a circle whose radius is smaller than the radius, R, of the chamber, means for charging pulverulent solids to the chamber at the peripheral wall and discharge means for withdrawing pulverulent solids and gaseous fluid along the axis of the chamber, the improvement wherein the fluid energy mill is provided with means for measuring the differential pressure between the discharge and feed of the mill through openings in the chamber peripheral wall and in the discharge means each opening provided with a means for purging into the mill to prevent pluggage.
Claim 2
Dependent Claim
144 words
In a fluid energy mill of the confined vortex type for comminuting pulverulent solids having in combination a disc-shaped chamber defined by a pair of opposing circular-shaped axial walls and a peripheral wall, a multiplicity of inlets extending through the peripheral wall and aligned for directing gaseous fluid into the chamber tangentially to a circle whose radius is smaller than the radius, R, of the chamber, means for charging pulverulent solids to the chamber at the peripheral wall and discharge means for withdrawing pulverulent solids and gaseous fluid along the axis of the chamber, the improvement wherein the fluid energy mill is provided with means for measuring the differential pressure between the discharge and feed of the mill through openings in the chamber peripheral wall and in the discharge means each opening provided with a means for purging into the mill to prevent pluggage.
Claim 3
Independent Claim
47 words
A method of grinding TiO 2 pigment solids by feeding said solids into a fluid energy mill of a confined vortex type at a rate that will maintain a constant differential pressure across the fluid energy mill that is within the range of 100-600 inches of water.
Claim 4
Independent Claim
47 words
A method of grinding TiO 2 pigment solids by feeding said solids into a fluid energy mill of a confined vortex type at a rate that will maintain a constant differential pressure across the fluid energy mill that is within the range of 100-600 inches of water.
Claim 5
Dependent Claim
11 words
The method of claim 2 wherein the differential pressure is 250-375.
Claim 6
Dependent Claim
11 words
The method of claim 2 wherein the differential pressure is 300-400.
Claim 7
Dependent Claim
11 words
The method of claim 2 wherein the differential pressure is 350-450.
References Cited (Backward Citations)
US2032827A
Cited
US2783947A
Cited
US2783948A
Cited
US3380665A
Cited
US3462086A
Cited
US3726484A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-04 | 1988-09-03 | 1989-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-04 | 1992-09-03 | 1993-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-04 | 1996-09-03 | 1997-03-05 | $7700.00 | Window Closed / Lapsed |