US4311599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduced methylene blue for oxygen removal
Assignee: ChampionX LLC
•
Filing: 1980-11-12
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Granted: 1982-01-19
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Expires: 2000-11-12
Abstract
Abstract An improved method for scavenging dissolved oxygen from alkaline waters which comprises treating said waters with at least 10 ppm of methylene blue in its reduced or leuco base form.
Inventors
- 👤 Manuel Slovinsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:27
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/20; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/16; C23F11/165; Y; Y10; Y10S; Y10S159/00; Y10S159/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
An improved method for scavenging dissolved oxygen from alkaline waters which consisting essentially of treating said waters with at least 10 ppm of methylene blue in its reduced or leuco base form.
Claim 2
Dependent Claim
32 words
An improved method for scavenging dissolved oxygen from alkaline waters which consisting essentially of treating said waters with at least 10 ppm of methylene blue in its reduced or leuco base form.
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) | 1985-01-18 | 1985-07-20 | 1986-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-18 | 1989-07-20 | 1990-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-18 | 1993-07-20 | 1994-01-19 | $7700.00 | Window Closed / Lapsed |