US3296027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal and inhibition of scale formation in steam generation
Assignee: ChampionX LLC
•
Filing: 1964-11-19
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Granted: 1967-01-03
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Expires: 1984-11-19
Abstract
No abstract record available.
Inventors
- 👤 Jacklin Clarence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:22
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/144; C23G; C23G1/00; C23G1/14; F; F28; F28G; F28G3/00; F28G3/16; F28G9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A METHOD OF REMOVING AND INHIBITING SCALE FORMATION IN BOILERS IN THE GENERATION OF STEAM FROM WATER WHICH HAS A TENDENCY TO FORM SCALE WHICH COMPRISES INCORPORATING WITH SAID WATER FROM WHICH SAID STEAM IS GENERATED UNDER PRESSURES RANGING FROM ABOUT 250 P.S.I. TO ABOUT 1100 P.S.I. A QUANTITY OF A SALT OF NITRILOTRICARBOXYLIC ACID SUFFICIENT TO ACCOMPLISH SAID REMOVAL AND INHIBITION, SAID SALT HAVING THE FOLLOWING STRUCTURAL FORMULA: (R-OOC-(CH2)X)3-N WHERE X IS AN INTEGER OF FROM 1 TO 2, AND R IS A RADICAL SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND ALKALI METAL, WITH AT LEAST ONE OCCURRENCE OF R BEING AN ALKALI METAL RADICAL AND BOILING SAID WATER UNDER SAID RANGE OF PRESSURE.
Claim 2
Independent Claim
116 words
A METHOD OF REMOVING AND INHIBITING SCALE FORMATION IN BOILERS IN THE GENERATION OF STEAM FROM WATER WHICH HAS A TENDENCY TO FORM SCALE WHICH COMPRISES INCORPORATING WITH SAID WATER FROM WHICH SAID STEAM IS GENERATED UNDER PRESSURES RANGING FROM ABOUT 250 P.S.I. TO ABOUT 1100 P.S.I. A QUANTITY OF A SALT OF NITRILOTRICARBOXYLIC ACID SUFFICIENT TO ACCOMPLISH SAID REMOVAL AND INHIBITION, SAID SALT HAVING THE FOLLOWING STRUCTURAL FORMULA: (R-OOC-(CH2)X)3-N WHERE X IS AN INTEGER OF FROM 1 TO 2, AND R IS A RADICAL SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND ALKALI METAL, WITH AT LEAST ONE OCCURRENCE OF R BEING AN ALKALI METAL RADICAL AND BOILING SAID WATER UNDER SAID RANGE OF PRESSURE.
References Cited (Backward Citations)
US2240957A
Cited
GB602726A
Cited
FR938395A
Cited
US2396938A
Cited
GB873488A
Cited
US3099521A
Cited
GB963556A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |