Patent US3697224A successfully refreshed from Google Patents.
US3697224A
Expired / Lapsed
US
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Titration of excess chelating agent
Assignee: ChampionX LLC
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Filing: 1970-10-30
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Granted: 1972-10-10
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Expires: 1990-10-30
Abstract
Abstract THE AMOUNT OF EXCESS CHELATING AGENT USED TO COUNTERACT WATER HARDNESS IS DETERMINED BY SPECTROPHOTOMERIC MEANS USING CALCON AS AN INDICATOR. THE SPECTROPHOTOMETRIC MEANS MAY BE OF LABORATORY SCALE OR MAY BE AN EMPIRICAL PART OF A FIELD KIT.
Inventors
- 👤 Jay C Means
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:06
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/16
Claims Analysis
Total Claims: 0
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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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |