US3750688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve and method for aqueous systems
Assignee: Dow Chemical Co
•
Filing: 1972-06-26
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Granted: 1973-08-07
•
Expires: 1992-06-26
Abstract
Abstract A valve is disposed in a line carrying an aqueous stream. The valve is in the form of a permeable bed of particulate swellable polymer particles which imbibe organic materials and on contact therewith will swell to provide a positive shutoff.
Inventors
- 👤 R Derby
- 👤 W Jennings
- 👤 R Hall
- 👤 D Haigh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:42
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/02; B01D17/0202; F; F16; F16K; F16K13/00; F16K31/00; F16K31/001; F16L; F16L55/00; F16L55/02; F16L55/027; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/2931; Y10T137/3003; Y10T137/3006
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
17 words
The method of claim 1 wherein the body of polymer is a body of akylstryene polymer particles.
Claim 2
Dependent Claim
18 words
The method of claim 1 wherein the body contains up to about 80 volume percent of non-swellable material.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the body is a mixture of poly-t-butylstyrene polymer particles and sand in admixture.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein the organic liquid is a hydrocarbon liquid.
Claim 5
Dependent Claim
66 words
A valving member, the valving member comprising a housing, the housing defining a cavity therein, the housing having an inlet and an outlet generally remotely disposed from each other and each in communication with the cavity, within the cavity a water permeable body of a swellable polymer which on contact with an organic liquid swells to a degree sufficient to prevent communication between inlet and outlet.
Claim 6
Dependent Claim
12 words
The valving member of claim 6 disposed in a conduit carrying water.
Claim 7
Dependent Claim
12 words
The valving member of claim 6 wherein the polymer is an alkylstyrene.
Claim 8
Dependent Claim
12 words
The valving member of claim 6 wherein the polymer is a poly-t-butylstyrene.
Claim 9
Dependent Claim
24 words
The valving member of claim 6 wherein the water permeable body is a mixture of a particulate alkylstyrene polymer and an inert particulate solid.
Claim 10
Dependent Claim
19 words
The valving member of claim 10 where the alkylstyrene polymer is poly-t-butylstyrene and the inert particulate solid is sand.
Claim 11
Dependent Claim
22 words
The valving member of claim 6 wherein the water permeable body is supported in fixed position by at least one foraminous support.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |