Patent US3682224A successfully refreshed from Google Patents.
US3682224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scale prevention agents of methacrylic acid-vinyl sulfonate copolymers for saline water evaporation
Assignee: Individual
•
Filing: 1970-12-17
•
Granted: 1972-08-08
•
Expires: 1990-12-17
Abstract
Abstract The temperature at which saline and sea-water evaporators can be operated is raised materially by adding from 1 - 10 parts of the copolymer of methacrylic acid and vinyl sulfonate, preferably in the form of a basic salt, to the saline water in the evaporator. At 10 PPM addition, the evaporators can be run at 280* F., and the water be allowed to concentrate ten-fold without the precipitation of calcium sulfate occuring on the evaporator surface. Monomer ratios of methacrylic acid to vinyl sulfonate may be varied from 50-50 to 25-75.
Inventors
- 👤 Merrill Bleyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:03
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F1/00; C02F1/02; C02F1/04; C02F1/042; C08; C08F; C08F8/00; C08F8/44; Y; Y10; Y10S; Y10S159/00; Y10S159/13; Y10S159/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
17 words
The process of claim 1 wherein the scale-inhibiting agent is the ammonium salt of the said copolymer.
Claim 2
Dependent Claim
17 words
The process of claim 1 wherein the scale-inhibiting agent is the triethylamine salt of the said copolymer.
Claim 3
Dependent Claim
35 words
The process of claim 1 wherein the scale-inhibiting agent is the sodium salt of the said copolymer, and wherein the pH of the solution of the said salt in water lies between pH7 and pH8.
Claim 4
Dependent Claim
43 words
The process of claim 1 wherein the moNomeric ratios of methacrylic acid and vinyl sulfonate lie in a range between 75 parts of methacrylic acid to 25 parts of vinyl sulfonate, to 25 parts of methacrylic acid to 75 parts of vinyl sulfonate.
Claim 5
Dependent Claim
23 words
The process of claim 1 wherein the copolymer moiety of the scale-inhibiting agent is the 50/50 copolymer of methacrylic acid and vinyl sulfonate.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein the said copolymer salt is added to the feed water of the evaporator.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein the saline water is sea water.
Claim 8
Dependent Claim
17 words
The process of claim 8 wherein the sea water is evaporated at temperatures up to 280* F.
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |