US2987426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkali baths for metal treatment
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1958-01-27
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Granted: 1961-06-06
•
Expires: 1978-01-27
Abstract
No abstract record available.
Inventors
- 👤 Shaw Richard Elliott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:36
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/16; C; C23; C23C; C23C22/00; C23C22/73; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/32; C23G; C23G1/00; C23G1/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
IN A PROCESS INVOLVING ALKALI TREATMENT OF A METAL WHEREIN THE METAL IS IMMERSED IN AN AQUEOUS ALKALI SOLUTION WITH THE EVOLUTION OF UNDESIRED FUMES OR SPRAY, THE IMPROVEMENT WHEREBY SAID EVOLUTION OF FUMES AND SPRAY IS MINIMIZED, SAID IMPROVEMENT COMPRISING IMMERSING SAID METAL IN AN AQUEOUS ALKALI SOLUTION COVERED WITH A SATURATED HYDROCARBON SURFACE LAYER WHICH IS LIQUID AT THE OPERATING TEMPERATURE, SAID LIQUID HYDROCARBON BEING SUBSTANTIALLY IMMISCIBLE WITH SAID ALKALI SOLUTION, SUBSTANTIALLY NON-VOLATILE AND STABLE AT THE OPERATING TEMPERATURE OF SAID SOLUTION AND INERT WITH RESPECT TO THE CONSTITUENTS OF THE SOLUTION, BOTH SAID SOLUTION AND SAID SURFACE LAYER HAVING A SURFACE ACTIVE AGENT DISSOLVED THEREIN.
Claim 2
Dependent Claim
108 words
IN A PROCESS INVOLVING ALKALI TREATMENT OF A METAL WHEREIN THE METAL IS IMMERSED IN AN AQUEOUS ALKALI SOLUTION WITH THE EVOLUTION OF UNDESIRED FUMES OR SPRAY, THE IMPROVEMENT WHEREBY SAID EVOLUTION OF FUMES AND SPRAY IS MINIMIZED, SAID IMPROVEMENT COMPRISING IMMERSING SAID METAL IN AN AQUEOUS ALKALI SOLUTION COVERED WITH A SATURATED HYDROCARBON SURFACE LAYER WHICH IS LIQUID AT THE OPERATING TEMPERATURE, SAID LIQUID HYDROCARBON BEING SUBSTANTIALLY IMMISCIBLE WITH SAID ALKALI SOLUTION, SUBSTANTIALLY NON-VOLATILE AND STABLE AT THE OPERATING TEMPERATURE OF SAID SOLUTION AND INERT WITH RESPECT TO THE CONSTITUENTS OF THE SOLUTION, BOTH SAID SOLUTION AND SAID SURFACE LAYER HAVING A SURFACE ACTIVE AGENT DISSOLVED THEREIN.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |