Patent US3293152A successfully refreshed from Google Patents.
US3293152A
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Method for preventing scale deposition
Assignee: Commonwealth Scientific and Industrial Research Organisation
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Filing: 1963-08-14
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Granted: 1966-12-20
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Expires: 1983-08-14
Abstract
No abstract record available.
Inventors
- 👤 Herbert Leonard Sidney
- 👤 Sterns Uldis Jekabs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:23
CPC Classifications
C; C23; C23F; C23F14/00; C23F14/02; C02; C02F; C02F5/00; C02F5/08; C02F5/10; Y; Y10; Y10S; Y10S159/00; Y10S159/13; Y10S159/15; Y10S159/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A METHOD OF PREVENTING THE FORMATION OF ADHERENT SCALE DEPOSITS ON THE HEAT TRANSFER SURFACES OF APPARATUS USED FOR THE EVAPORATION OF SEA WATER CONTAINING CONCENTRATIONS OF CALCIUM AND MAGNESIUM SALTS WHICH CONSISTS OF THE STEP OF ADDING A POLYACRYLIC ACID HAVING A CONCENTRATION EXPRESSED AS THE PRODUCT OF THE PARTS PER MILLION AND THE MOLECULAR WEIGHT OF BETWEEN ABOUT 20,000 AND ABOUT 960,000 TO SAID SEA WATER THUS FORMING A REGENERATING SELF-STRIPPING FILM ON SAID HEAT TRANSFER SURFACES.
Claim 2
Independent Claim
79 words
A METHOD OF PREVENTING THE FORMATION OF ADHERENT SCALE DEPOSITS ON THE HEAT TRANSFER SURFACES OF APPARATUS USED FOR THE EVAPORATION OF SEA WATER CONTAINING CONCENTRATIONS OF CALCIUM AND MAGNESIUM SALTS WHICH CONSISTS OF THE STEP OF ADDING A POLYACRYLIC ACID HAVING A CONCENTRATION EXPRESSED AS THE PRODUCT OF THE PARTS PER MILLION AND THE MOLECULAR WEIGHT OF BETWEEN ABOUT 20,000 AND ABOUT 960,000 TO SAID SEA WATER THUS FORMING A REGENERATING SELF-STRIPPING FILM ON SAID HEAT TRANSFER SURFACES.
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) | 1969-12-19 | 1970-06-20 | 1970-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-19 | 1974-06-20 | 1974-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-19 | 1978-06-20 | 1978-12-20 | $7700.00 | Window Closed / Lapsed |