US2797199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibitor
Assignee: California Research LLC
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Filing: 1953-09-11
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Granted: 1957-06-25
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Expires: 1973-09-11
Abstract
No abstract record available.
Inventors
- 👤 Joseph F Chittum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:18
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A COHESIVE SOLID CORROSION INHIBITOR ADAPTED TO INHIBIT CORROSION OF FERROUS METALS IN STEAM GENERATING SYSTEMS WHEN EMPLOYED IN CONCENTRATIONS IN THE RANGE ABOUT 0.001 TO ABOUT 0.2% BY WEIGHT CONSISTING ESSENTIALLY OF AN INTIMATE MIXTURE OF APPROXIMATELY EQUAL PARTS BY WEIGHT OF THIOUREA,DIPHENYLTHIOUREA AND AN ALKALI METAL SULFITE, SAID INHIBITOR BEING PREPARED BY DISPERSING THE SULFITE IN A MOLTEN MIXTURE OF THIOUREA AND DIPHENYL THIOUREA.
Claim 2
Dependent Claim
66 words
A COHESIVE SOLID CORROSION INHIBITOR ADAPTED TO INHIBIT CORROSION OF FERROUS METALS IN STEAM GENERATING SYSTEMS WHEN EMPLOYED IN CONCENTRATIONS IN THE RANGE ABOUT 0.001 TO ABOUT 0.2% BY WEIGHT CONSISTING ESSENTIALLY OF AN INTIMATE MIXTURE OF APPROXIMATELY EQUAL PARTS BY WEIGHT OF THIOUREA,DIPHENYLTHIOUREA AND AN ALKALI METAL SULFITE, SAID INHIBITOR BEING PREPARED BY DISPERSING THE SULFITE IN A MOLTEN MIXTURE OF THIOUREA AND DIPHENYL THIOUREA.
References Cited (Backward Citations)
US2238651A
Cited
US2562549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-24 | 1960-12-24 | 1961-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-24 | 1964-12-24 | 1965-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-24 | 1968-12-24 | 1969-06-25 | $7700.00 | Window Closed / Lapsed |