US3074825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing copper-containing iron oxide incrustations from ferriferous surfaces
Assignee: Chemical Cleaning Inc
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Filing: 1962-04-03
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Granted: 1963-01-22
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Expires: 1982-04-03
Abstract
No abstract record available.
Inventors
- 👤 George S Gardner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:22
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
IN THE ART OF REMOVING COPPER-CONTAINING IRON OXIDE INCRUSTATIONS FROM FERRIFEROUS SURFACES BY SUBJECTING THE SURFACES TO THE ACTION OF AN AQUEOUS ACID SOLUTION CAPABLE OF DISSOLVING THE INCRUSTATIONS, THE METHOD WHICH COMPRISES ADDING TO THE SOLUTION A SOLUBLE METHYLOL THIOUREA HAVING THE FORMULA. X-NH-C(=S)-NH-CH2-OH WHEREIN X IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND CH2OH AND THEN TREATING THE SURFACE WITH THE SOLUTION TO EFFECT REMOVAL OF INCRUSTATIONS.
Claim 2
Dependent Claim
70 words
IN THE ART OF REMOVING COPPER-CONTAINING IRON OXIDE INCRUSTATIONS FROM FERRIFEROUS SURFACES BY SUBJECTING THE SURFACES TO THE ACTION OF AN AQUEOUS ACID SOLUTION CAPABLE OF DISSOLVING THE INCRUSTATIONS, THE METHOD WHICH COMPRISES ADDING TO THE SOLUTION A SOLUBLE METHYLOL THIOUREA HAVING THE FORMULA. X-NH-C(=S)-NH-CH2-OH WHEREIN X IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND CH2OH AND THEN TREATING THE SURFACE WITH THE SOLUTION TO EFFECT REMOVAL OF INCRUSTATIONS.
References Cited (Backward Citations)
US2959555A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-21 | 1966-07-23 | 1967-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-21 | 1970-07-23 | 1971-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-21 | 1974-07-23 | 1975-01-22 | $7700.00 | Window Closed / Lapsed |