US2831814A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid pickling of metals and compositions therefor
Assignee: Poor and Co
•
Filing: 1951-12-19
•
Granted: 1958-04-22
•
Expires: 1971-12-19
Abstract
No abstract record available.
Inventors
- 👤 Allan E Chester
- 👤 Joseph T Irwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:35
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/08; C23G1/081
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A SULFURIC ACID PICKLING BATH CONTAINING 6% TO 20% SULFURIC ACID, SODIUM FURROCYANIDE AND SODIUM THIOSULFATE, THE QUANTITY OF SODIUM THIOSULFATE BEING SUFFICIENT TO LIBERATE ABOUT 1 TO 8 PART COLLOIDAL REACTIVE SULFUR PER 500 PARTS OF H2SO4 AND THE QUANTITY OF SODIUM FERROCYANIDE BEING APPROXIMATELY 1.5 TO 10 TIMES THE QUANTITY OF SODIUM THIOSULFATE.
Claim 2
Dependent Claim
55 words
A SULFURIC ACID PICKLING BATH CONTAINING 6% TO 20% SULFURIC ACID, SODIUM FURROCYANIDE AND SODIUM THIOSULFATE, THE QUANTITY OF SODIUM THIOSULFATE BEING SUFFICIENT TO LIBERATE ABOUT 1 TO 8 PART COLLOIDAL REACTIVE SULFUR PER 500 PARTS OF H2SO4 AND THE QUANTITY OF SODIUM FERROCYANIDE BEING APPROXIMATELY 1.5 TO 10 TIMES THE QUANTITY OF SODIUM THIOSULFATE.
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) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |