US3720737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of centrifugal atomization
Assignee: ATOMIZATION SYST Inc
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Filing: 1971-08-10
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Granted: 1973-03-13
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Expires: 1991-08-10
Abstract
Abstract Method of carrying out centrifugal atomization of a liquid to form solid particles, by spinning the liquid in a cup having a perforated upright sidewall so as to project fine streams of the liquid at high velocity through the perforations into a sealed chamber in which a stagnant gaseous medium is maintained at a temperature to form solid particles from the liquid, while the composition and density of the medium are coordinated to maintain a ratio of viscosity to density which is substantially less than that of air at atmospheric pressure. Preferably the stagnant gaseous medium is maintained at a pressure substantially in excess of one atmosphere. The method is applicable to the formation of powders from melted solids or to centrifugal spray drying of solids in solution.
Inventors
- 👤 D Klaphaak
- 👤 L Barnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:08
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/02; B01J2/04
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
148 words
In a process of forming solid particles from a melted material which is atomized by projecting it in the form of droplets generally horizontally at a predetermined velocity into a stagnant gaseous medium, said medium being maintained substantially at a selected pressure which is not less than one atmosphere and substantially at a selected temperature which is in a range below the melting point of the atomized material so as to form solid particles of said material in said medium, the improvement comprising: said gaseous medium having a ratio of viscosity to density at said selected pressure and at said selected temperature substantially below that of air at atmospheric pressure and at said selected temperature, whereby the solid particles have a smaller log mean diameter than would particles formed by projecting the same liquid at the same velocity into air at atmospheric pressure and at said selected temperature.
Claim 2
Dependent Claim
148 words
In a process of forming solid particles from a melted material which is atomized by projecting it in the form of droplets generally horizontally at a predetermined velocity into a stagnant gaseous medium, said medium being maintained substantially at a selected pressure which is not less than one atmosphere and substantially at a selected temperature which is in a range below the melting point of the atomized material so as to form solid particles of said material in said medium, the improvement comprising: said gaseous medium having a ratio of viscosity to density at said selected pressure and at said selected temperature substantially below that of air at atmospheric pressure and at said selected temperature, whereby the solid particles have a smaller log mean diameter than would particles formed by projecting the same liquid at the same velocity into air at atmospheric pressure and at said selected temperature.
Claim 3
Dependent Claim
36 words
The process of claim 1 in which the gaseous medium at said selected pressure and at said selected temperature has a viscosity less than that of air at said selected pressure and at said selected temperature.
Claim 4
Dependent Claim
36 words
The process of claim 2 in which the gaseous medium at said selected pressure and at said selected temperature has a density greater than that of air at said selected pressure and at said selected temperature.
Claim 5
Dependent Claim
36 words
The process of claim 1 in which the gaseous medium at said selected pressure and at said selected temperature has a density greater than that of air at said selected pressure and at said selected temperature.
Claim 6
Dependent Claim
13 words
The process of claim 1 in which the gaseous medium is carbon dioxide.
Claim 7
Dependent Claim
21 words
The process of claim 1 in which the gaseous medium is maintained at a pressure substantially in excess of one atmosphere.
Claim 8
Dependent Claim
20 words
The process of claim 6 in which the gaseous medium is maintained at a pressure in excess of two atmospheres.
Claim 9
Dependent Claim
17 words
The process of claim 1 in which the material is projected centrifugally as discrete streams of droplets.
Claim 10
Dependent Claim
156 words
In a process of forming solid particles from a liquid which consists of a solid material dissolved in a solvent, said liquid being atomized by projecting it in the form of droplets generally horizontally at a predetermined velocity into a stagnant gaseous medium which is maintained substantially at a selected pressure which is not less than one atmosphere and substantially at a selected temperature which is in a range within which said solvent flash evaporates to leave particles of said solid material in said gaseous medium the improvement comprising: said gaseous medium having a ratio of viscosity to density at said selected pressure and at said selected temperature substantially below that of air at atmospheric pressure and at said selected temperature, whereby the particles of solid material have a smaller log mean diameter than would particles formed by projecting the same liquid at the same velocity into air at atmospheric pressure and at said selected temperature.
Claim 11
Dependent Claim
156 words
In a process of forming solid particles from a liquid which consists of a solid material dissolved in a solvent, said liquid being atomized by projecting it in the form of droplets generally horizontally at a predetermined velocity into a stagnant gaseous medium which is maintained substantially at a selected pressure which is not less than one atmosphere and substantially at a selected temperature which is in a range within which said solvent flash evaporates to leave particles of said solid material in said gaseous medium the improvement comprising: said gaseous medium having a ratio of viscosity to density at said selected pressure and at said selected temperature substantially below that of air at atmospheric pressure and at said selected temperature, whereby the particles of solid material have a smaller log mean diameter than would particles formed by projecting the same liquid at the same velocity into air at atmospheric pressure and at said selected temperature.
Claim 12
Dependent Claim
35 words
The process of claim 9 in which the gaseous medium at said selected pressure and at said selected temperature has a viscosity less than that of air at selected pressure and at said selected temperature.
Claim 13
Dependent Claim
36 words
The process of claim 10 in which the gaseous medium at said selected pressure and at said selected temperature has a density greater than that of air at said selected pressure and at said selected temperature.
Claim 14
Dependent Claim
36 words
The process of claim 9 in which the gaseous medium at said selected pressure and at said selected temperature has a density greater than that of air at said selected pressure and at said selected temperature.
Claim 15
Dependent Claim
13 words
The process of claim 9 in which the gaseous medium is carbon dioxide.
Claim 16
Dependent Claim
21 words
The process of claim 9 in which the gaseous medium is maintained at a pressure substantially in excess of one atmosphere.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |