Patent US2992946A successfully refreshed from Google Patents.
US2992946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removing leaded deposits from metal
Assignee: Purex Corp Ltd
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Filing: 1955-05-25
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Granted: 1961-07-18
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Expires: 1975-05-25
Abstract
No abstract record available.
Inventors
- 👤 Arden Benjamin
- 👤 Francis E Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:28
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
THE METHOD OF REMOVING LEADING DEPOSITS FROM A METALLIC PART CARRYING THE SAME, WHICH COMPRISES CONTACTING SAID METALLIC PART AT AN ELEVATED TEMPERATURE WITH A SOLUTION CONTAINING FROM ABOUT 4 TO ABOUT 40 PARTS BY WEIGHT OF ALKALI METAL HYDROXIDE CALCULATED AS ALKALI METAL OXIDE AND FROM ABOUT 1 TO ABOUT 45 PARTS BY WEIGHT OF A LEAD COMPLEXING AGENT CHOSEN FROM THE GROUP CONSISTING OF THE WATER SOLUBLE ALKALI METAL SALTS OF THE FATTY ACIDS OF 1 TO 4 CARBON ATOMS AND THE HYDROXY ALIPHATIC ACIDS, SAID HYDROXY ALIPHATIC ACIDS BEING CHOSEN FROM THE GROUP CONSISTING OF LACTIC ACID, CITRIC ACID, TARTARIC ACID, GLUONIC ACID, GLYCERIC ACID, MALIC ACID, GLYCOLLIC ACID AND SACCHARIC ACID, AND REACTING SAID SOLUTION WITH SAID LEADED DEPOSITS TO REMOVE THE SAME SAID METALLIC PART.
Claim 2
Independent Claim
130 words
THE METHOD OF REMOVING LEADING DEPOSITS FROM A METALLIC PART CARRYING THE SAME, WHICH COMPRISES CONTACTING SAID METALLIC PART AT AN ELEVATED TEMPERATURE WITH A SOLUTION CONTAINING FROM ABOUT 4 TO ABOUT 40 PARTS BY WEIGHT OF ALKALI METAL HYDROXIDE CALCULATED AS ALKALI METAL OXIDE AND FROM ABOUT 1 TO ABOUT 45 PARTS BY WEIGHT OF A LEAD COMPLEXING AGENT CHOSEN FROM THE GROUP CONSISTING OF THE WATER SOLUBLE ALKALI METAL SALTS OF THE FATTY ACIDS OF 1 TO 4 CARBON ATOMS AND THE HYDROXY ALIPHATIC ACIDS, SAID HYDROXY ALIPHATIC ACIDS BEING CHOSEN FROM THE GROUP CONSISTING OF LACTIC ACID, CITRIC ACID, TARTARIC ACID, GLUONIC ACID, GLYCERIC ACID, MALIC ACID, GLYCOLLIC ACID AND SACCHARIC ACID, AND REACTING SAID SOLUTION WITH SAID LEADED DEPOSITS TO REMOVE THE SAME SAID METALLIC PART.
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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) | 1964-07-17 | 1965-01-16 | 1965-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-17 | 1969-01-16 | 1969-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-17 | 1973-01-16 | 1973-07-18 | $7700.00 | Window Closed / Lapsed |