Patent US4162282A successfully refreshed from Google Patents.
US4162282A
Expired / Lapsed
US
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Method for producing uniform particles
Assignee: Coulter Electronics Inc
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Filing: 1976-04-22
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Granted: 1979-07-24
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Expires: 1996-04-22
Abstract
Abstract Uniform particles are produced by introducing a laminar stream of a core liquid into a laminar flowing body of an immiscible sheath liquid. The core liquid or the sheath liquid, or both liquids, can contain one or more materials dispersed (dissolved or suspended) in them from which the uniform particles are formed. The two liquids and the dispersed material are expelled from a nozzle to form a liquid jet. The liquid jet is disturbed at a uniform, periodic rate to form liquid droplets which contain a uniform amount of the core liquid, the sheath liquid and the dispersed material. The droplets are collected and held in a catch liquid until the core and the sheath liquid in each droplet have diffused into the catch liquid leaving the uniform particles formed from the dispersed materials. There can be more than one sheath liquid which can also contain one or more materials dispersed in it.
Inventors
- 👤 Mack J. Fulwyler
- 👤 C. William Hatcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:14
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/04; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987; Y10T428/2989; Y10T436/00; Y10T436/10; Y10T436/101666
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
124 words
A method for producing uniformly sized particles from dispersed material in at least one of a core and sheath liquids said method comprising the steps of: dispersing at least one particle forming material into at least one of said core and said sheath liquids; introducing said core liquid into a moving body of at least one sheath liquid; forming a liquid jet of said core liquid and said sheath liquid; periodically disturbing said liquid jet to separate said liquid jet including said core and said sheath liquids into unconnected uniform droplets containing a uniform amount of said core liquid, said sheath liquid and said disbursed material; applying like-repelling charges to each of said uniform droplets; and forming uniformly sized particles from said uniform droplets.
Claim 2
Independent Claim
124 words
A method for producing uniformly sized particles from dispersed material in at least one of a core and sheath liquids said method comprising the steps of: dispersing at least one particle forming material into at least one of said core and said sheath liquids; introducing said core liquid into a moving body of at least one sheath liquid; forming a liquid jet of said core liquid and said sheath liquid; periodically disturbing said liquid jet to separate said liquid jet including said core and said sheath liquids into unconnected uniform droplets containing a uniform amount of said core liquid, said sheath liquid and said disbursed material; applying like-repelling charges to each of said uniform droplets; and forming uniformly sized particles from said uniform droplets.
Claim 3
Dependent Claim
27 words
A method of producing particles according to claim 1 wherein the step of dispersing includes: dispersing at least one particle forming material only into said core liquid.
Claim 4
Dependent Claim
27 words
A method of producing particles according to claim 1 wherein the step of dispersing includes: dispersing at least one particle forming material only into said sheath liquid.
Claim 5
Dependent Claim
31 words
A method of producing particles according to claim 1 wherein the step of dispersing includes: dispersing at least one particle forming material into said core liquid and into said sheath liquid.
Claim 6
Dependent Claim
35 words
A method of producing particles according to claim 1 wherein said step of periodically disturbing includes: uniformly and periodically disturbing said liquid jet in a transverse direction to said liquid jet at a constant rate.
Claim 7
Dependent Claim
30 words
A method of producing particles according to claim 1 wherein said step of introducing includes: introducing said core liquid substantially into the center of said moving body of sheath liquid.
Claim 8
Dependent Claim
31 words
A method of producing particles according to claim 1 wherein said step of introducing includes: introducing said core liquid substantially coaxial with the axis of said moving body of sheath liquid.
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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) | 1982-07-23 | 1983-01-22 | 1983-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-23 | 1987-01-22 | 1987-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-23 | 1991-01-22 | 1991-07-24 | $7700.00 | Window Closed / Lapsed |