US3670897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Desalination of sea water
Assignee: Individual
•
Filing: 1970-03-20
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Granted: 1972-06-20
•
Expires: 1990-03-20
Abstract
Abstract Desalination of sea water is accomplished by use of osmosis wherein there is a saline water chamber and a chamber having a concentrated solution of an intermediate or precipitable soluble salt, such as aluminum sulfate, the chambers being separated by a semipermeable membrane. Fresh water will pass from the saline or sea water to the salt solution without use of pressure. The excess concentrated salt solution in the second chamber passes to a third chamber or place where salt is removed by being brought into contact with a precipitant such as calcium hydroxide in the case of aluminum sulfate.
Inventors
- 👤 Bruce S Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:21
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/002; B01D61/0022; C; C02; C02F; C02F1/00; C02F1/44; C02F1/445; C02F2103/00; C02F2103/08; Y; Y02; Y02A; Y02A20/00; Y02A20/124; Y02A20/131
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
14 words
An apparatus as claimed in claim 1 wherein the adjusting agent includes carbon dioxide.
Claim 2
Dependent Claim
27 words
An apparatus as claimed in claim 1 wherein the chemically precipitable soluble salt is selected from the group consisting of aluminum sulfate, magnesium sulfate and manganese sulfate.
Claim 3
Dependent Claim
13 words
An apparatus as claimed in claim 3, wherein the precipitant is calcium hydroxide.
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |