Patent US3849328A successfully refreshed from Google Patents.
US3849328A
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US
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Process and composition for inhibiting scale deposition
Assignee: Texaco Inc
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Filing: 1972-05-04
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Granted: 1974-11-19
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Expires: 1992-05-04
Abstract
Abstract Scale prone waters may be treated with certain sulfonated alkali lignins to inhibit the build up of mineral scale deposits from the scale prone waters upon surfaces in contact with the scale prone waters. Sulfonated alkali lignins are dissolved in the scale prone waters in sufficient concentration to inhibit the formation of mineral scale on the surfaces.
Inventors
- 👤 V Schievelbein
- 👤 T Sample
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:05
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C09; C09K; C09K8/00; C09K8/52; C09K8/528; Y; Y10; Y10S; Y10S507/00; Y10S507/927
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
43 words
A METHOD FOR INHIBITING THE FORMATION OF MINERAL SCALE UPON A SUBSTRATE SURFACE IN CONTACT WITH SCALE PRONE WATERS WHICH COMPRISES DISSOLVING SULFONATED ALKALI LIGNINS IN THE SCALE PRONE WATERS IN AN AMOUNT FROM ABOUT 0.005 PERCENT TO ABOUT 0.01 PERCENT BY WEIGHT.
Claim 2
Independent Claim
43 words
A METHOD FOR INHIBITING THE FORMATION OF MINERAL SCALE UPON A SUBSTRATE SURFACE IN CONTACT WITH SCALE PRONE WATERS WHICH COMPRISES DISSOLVING SULFONATED ALKALI LIGNINS IN THE SCALE PRONE WATERS IN AN AMOUNT FROM ABOUT 0.005 PERCENT TO ABOUT 0.01 PERCENT BY WEIGHT.
Claim 3
Dependent Claim
21 words
A method of claim 1 wherein the sulfonated alkali lignins have a degree of sulfonation from about 0.8 to about 4.0.
Claim 4
Dependent Claim
36 words
An aqueous solution which will inhibit the formation of mineral scale upon substrate surfaces which consists essentially of an aqueous solution of sulfonated alkali lignins in an amount from about 0.0005 to 0.01 percent by weight.
Claim 5
Dependent Claim
36 words
An aqueous solution which will inhibit the formation of mineral scale upon substrate surfaces which consists essentially of an aqueous solution of sulfonated alkali lignins in an amount from about 0.0005 to 0.01 percent by weight.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |