US3846515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical foam generating method and system
Assignee: Chemetron Corp
•
Filing: 1973-09-17
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Granted: 1974-11-05
•
Expires: 1993-09-17
Abstract
Abstract A first portion of water under pressure is mixed with a foam liquid concentrate and a gas such as air in a pump to form a primary foam upon discharge from the pump and a second portion of water under pressure is mixed with the primary foam thereby enabling the generation of a given volume of foam by the use of a smaller pump than would be required by the prior practice of passing both portions of water through the pump.
Inventors
- 👤 H Williamson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:17
CPC Classifications
A; A62; A62C; A62C5/00; A62C5/002; Y; Y10; Y10S; Y10S261/00; Y10S261/26
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
111 words
A mechanical foam generating system comprising a pump having a gas inlet port, a liquid inlet port and a foam outlet port, a liquid inlet conduit connected to the liquid inlet port, a main water conduit adapted for connection to a source of water under pressure, a pump water conduit between the main water conduit and the liuqid inlet conduit, a foam liquid concentrate conduit adapted for connection to a concentrate reservoir and connected to the liquid inlet conduit, a foam conduit connected to the foam outlet port and a by-pass water conduit between the main water conduit and the foam conduit whereby a portion of the water bypasses the pump.
Claim 2
Dependent Claim
111 words
A mechanical foam generating system comprising a pump having a gas inlet port, a liquid inlet port and a foam outlet port, a liquid inlet conduit connected to the liquid inlet port, a main water conduit adapted for connection to a source of water under pressure, a pump water conduit between the main water conduit and the liuqid inlet conduit, a foam liquid concentrate conduit adapted for connection to a concentrate reservoir and connected to the liquid inlet conduit, a foam conduit connected to the foam outlet port and a by-pass water conduit between the main water conduit and the foam conduit whereby a portion of the water bypasses the pump.
Claim 3
Dependent Claim
23 words
The system of claim 1 characterized further by means for proportioning the amounts of foam liquid concentrate and water flowing into the pump.
Claim 4
Dependent Claim
21 words
The system of claim 2 wherein the proportioning means comprise orifice plates in the foam liquid concentrate anD pump water conduits.
Claim 5
Dependent Claim
21 words
The system of claim 1 characterized further by a means for regulating the flow of water through the by-pass water conduit.
Claim 6
Dependent Claim
25 words
The system of claim 4 wherein the regulating means comprises a valve responsive to a pressure differential across a restriction in the by-pass water conduit.
Claim 7
Dependent Claim
22 words
The system of claim 1 characterized further by means for relieving pressure in excess of a predetermined value in the foam conduit.
Claim 8
Dependent Claim
28 words
The system of claim 1 characterized further by a check valve mounted in the foam conduit and arranged to permit flow of foam away from the pump only.
Claim 9
Dependent Claim
46 words
The system of claim 1 characterized further by a check valve mounted in the main water conduit and arranged to permit flow of water to the pump water conduit and bypass water conduit and to check flow of foam from said conduits into the water source.
Claim 10
Independent Claim
74 words
A method for generating mechanical foam comprising the steps of dividing a stream of water under pressure into first and second portions, mixing the first portion of the water with a foam liquid concentrate and a gas in a positive displacement pump to make a concentrate-rich mixture, discharging said mixture from the pump to form a primary foam, and mixing the second portion of water with the primary foam to make a diluted foam.
Claim 11
Independent Claim
74 words
A method for generating mechanical foam comprising the steps of dividing a stream of water under pressure into first and second portions, mixing the first portion of the water with a foam liquid concentrate and a gas in a positive displacement pump to make a concentrate-rich mixture, discharging said mixture from the pump to form a primary foam, and mixing the second portion of water with the primary foam to make a diluted foam.
Claim 12
Dependent Claim
17 words
The method of claim 9 wherein the first and second portions of water are of equal volume.
Claim 13
Dependent Claim
16 words
The method of claim 9 wherein the second portion is a major portion of the water.
Claim 14
Dependent Claim
22 words
The method of claim 9 wherein the second portion constitutes from about 70 to about 80 percent of the stream of water.
Claim 15
Dependent Claim
32 words
The method of claim 9 wherein the step of mixing the second portion of water with the primary foam includes refining of the diluted foam to a mass of substantially uniform bubbles.
Claim 16
Dependent Claim
19 words
The method of claim 13 wherein the diluted foam is refined by passing it through at least one screen.
Claim 17
Dependent Claim
32 words
The method of claim 13 wherein the diluted foam is refined by passing it through a conduit having its crosssection filled with tubes having axes parallel to each other and the conduit.
Claim 18
Dependent Claim
10 words
The method of claim 9 wherein the gas is air.
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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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |