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US4781467A
Expired / Lapsed
US
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Foam-generating apparatus
Assignee: CCA Inc A CORP OF TX
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Filing: 1987-10-15
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Granted: 1988-11-01
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Expires: 2007-10-15
Abstract
Abstract The invention involves a mixing apparatus capable of mixing two or more chemicals using a motive liquid. An ejector draws in a first chemical which is directed to the input of an eductor. A second chemical is connected directly to the eductor. The motive liquid provides the motive force for both the ejector and the eductor. By reason of the feeding of the first chemical to the eductor from the separate ejector rather than directly into the eductor, the ratio of the first chemical to the second chemical fed into the eductor is more accurately controlled than if both chemicals were directly fed to the eductor. The chemicals are mixed in the eductor and are discharged as a foam preferably through a foam nozzle.
Inventors
- 👤 Leslie P. Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:13
CPC Classifications
B; B01; B01F; B01F35/00; B01F23/00; B01F23/40; B01F23/49; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87265; Y10T137/87338; Y10T137/87346; Y10T137/87571; Y10T137/87587; Y10T137/87595
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
227 words
An apparatus for mixing chemicals comprising: a motive liquid inlet; a first chemical inlet; a second chemical inlet; a mixed chemicals outlet; an eductor means having a first chemical inlet port and a second chemical inlet port; said eductor means having an inlet in flow communication with said motive liquid inlet for flowing liquid under pressure through said eductor means to create a reduced pressure therein, and also having an outlet in flow communication with said mixed chemicals outlet; conduit means connecting said second chemical inlet to said second chemical inlet port of said eductor means; ejector means disposed in fluid communication with said motive liquid inlet and also with said first chemical inlet and said first chemical inlet port of said eductor means for causing a flow of a chemical from said first chemical inlet through the ejector means to said first chemical inlet port of said eductor means substantially independently of the flow rate of a chemical flowing into said eductor means from said second chemical inlet to facilitate control of the ratio of the chemicals entering said eductor means; and said eductor means inducing flow of the chemical directly from said second chemical inlet into said second chemical inlet port and also the chemical from said ejector means for mixing the chemicals in said eductor means and discharging the mixed chemicals therefrom under pressure.
Claim 2
Independent Claim
227 words
An apparatus for mixing chemicals comprising: a motive liquid inlet; a first chemical inlet; a second chemical inlet; a mixed chemicals outlet; an eductor means having a first chemical inlet port and a second chemical inlet port; said eductor means having an inlet in flow communication with said motive liquid inlet for flowing liquid under pressure through said eductor means to create a reduced pressure therein, and also having an outlet in flow communication with said mixed chemicals outlet; conduit means connecting said second chemical inlet to said second chemical inlet port of said eductor means; ejector means disposed in fluid communication with said motive liquid inlet and also with said first chemical inlet and said first chemical inlet port of said eductor means for causing a flow of a chemical from said first chemical inlet through the ejector means to said first chemical inlet port of said eductor means substantially independently of the flow rate of a chemical flowing into said eductor means from said second chemical inlet to facilitate control of the ratio of the chemicals entering said eductor means; and said eductor means inducing flow of the chemical directly from said second chemical inlet into said second chemical inlet port and also the chemical from said ejector means for mixing the chemicals in said eductor means and discharging the mixed chemicals therefrom under pressure.
Claim 3
Dependent Claim
34 words
The apparatus of claim 1, wherein: said first chemical inlet port and said second chemical inlet port ar aligned in opposition to each other in the vicinity of a venturi in said eductor means.
Claim 4
Dependent Claim
27 words
The apparatus of claim 1, comprising: restriction means with said first and second chemical inlets for regulation of chemical flow through said first and second chemical inlets.
Claim 5
Dependent Claim
29 words
The apparatus of claim 1, comprising: purge means in fluid communication with said motive liquid inlet for purging from said eductor means the chemical from said second chemical inlet.
Claim 6
Dependent Claim
68 words
The apparatus of claim 4, further comprising: a chemical conduit between the outlet of said ejector and said first chemical inlet port on said eductor means; said purge means further comprising a purge conduit between said motive liquid inlet and said chemical conduit; and a purge valve in said purge conduit which is normally closed but is adapted to be opened to flush chemical from said eductor means.
Claim 7
Dependent Claim
84 words
The apparatus of claim 4, wherein said purge means further comprises: a purge conduit extending from said motive liquid inlet to said conduit means; and a multi-position valve means connected in said conduit means and said purge conduit for flow alignment of said motive liquid inlet to said conduit means in one position for flushing chemical from said eductor means and flow alignment of said second chemical inlet to said second chemical port in a second position for feeding chemical to said eductor means.
Claim 8
Dependent Claim
14 words
The apparatus of claim 6, wherein: said multi-position valve means is a three-way valve.
Claim 9
Dependent Claim
54 words
The apparatus of claim 1, including: an open tank connected to said second chemical inlet for holding and supplying a chemical in liquid form which hardens to a gel upon mixture with water; and means for providing an inert gas blanket on the chemical liquid in said tank to prevent contact of water therewith.
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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) | 1991-11-01 | 1992-05-02 | 1992-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-01 | 1996-05-02 | 1996-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-01 | 2000-05-02 | 2000-11-01 | $7700.00 | Window Closed / Lapsed |