US2823184A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition and process for metal pickling
Assignee: Pennwalt Corp
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Filing: 1953-03-23
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Granted: 1958-02-11
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Expires: 1973-03-23
Abstract
No abstract record available.
Inventors
- 👤 Ralph E Plump
- 👤 James W Carroll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:46
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/04; C23G1/06; C23G1/065; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/10; C08G12/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
85 words
A PICKLING BATH COMPRISING AN AQUEOUS SOLUTION OF A NON-OXIDIZING INORGANIC PICKLING ACID, SAID SOLUTION CONTAINING 0.001 TO 7% BY WEIGHT OF THE CONDENSATION PRODUCT RESULTING FROM AN ACIDIFIED REACTION MIXTURE OF SULFITE PULP WASTE LIQUOR, WATER-SOLUBLE ALDEHYDE, UREA AND THIOUREA IN WHICH REACTION MIXTURE 0.1 TO 5 MOLS OF ALDEHYDE ARE PRESENT PER MOL OF COMBINED UREA AND THIOUREA AND SAID SULFITE PULP WASTE LIQUOR CONTAINS NOT MORE THAN 1 GRAM OF SULFITE PULP WASTE LIQUOR SOLIDS PER GRAM OF COMBINED UREA AND THIOUREA.
References Cited (Backward Citations)
US1807711A
Cited
US1852648A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-10 | 1961-08-12 | 1962-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-10 | 1965-08-12 | 1966-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-10 | 1969-08-12 | 1970-02-11 | $7700.00 | Window Closed / Lapsed |