US2882135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical composition and process for aluminum etching
Assignee: Pennwalt Corp
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Filing: 1955-03-07
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Granted: 1959-04-14
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Expires: 1975-03-07
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert Houston Elliott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:08
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/32; C23F1/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
IN THE ETCHING OF ALUMINUM INVOLVING THE STEP OF IMMERSING ALUMINUM IN AN AQUEOUS ALKALINE ETCHING BATH CONTAINING FROM 1% TO 15% OF ETCHING ALKALI MAINTAINED AT A TEMPERATURE OF FROM 110* TO 200*F. AND CONTAINING FROM 0.8% TO 6%, BASED ON THE WEIGHT OF THE ETCHING ALKALI, OF A SCALE INHIBITOR EFFECTIVE IN PREVENTING ALKALI ALUMINATES FORMING DURING THE ETCHING OPERATION FROM DEPSOITING AS A SCALE, THE METHOD OF DECREASING THE ETCHING RATE COMPRISING THE STEP OF INCLUDING IN SAID ETCHING BATH A METAL ION SELECTED FROM THE GROUP CONSISTING OF STRONTIUM BARIUM AND CALCIUM IONS IN AMOUNTS RANGING FROM 3% TO 140% BASED ON THE WEIGHT OF THE SCALE INHIBITOR.
Claim 2
Dependent Claim
112 words
IN THE ETCHING OF ALUMINUM INVOLVING THE STEP OF IMMERSING ALUMINUM IN AN AQUEOUS ALKALINE ETCHING BATH CONTAINING FROM 1% TO 15% OF ETCHING ALKALI MAINTAINED AT A TEMPERATURE OF FROM 110* TO 200*F. AND CONTAINING FROM 0.8% TO 6%, BASED ON THE WEIGHT OF THE ETCHING ALKALI, OF A SCALE INHIBITOR EFFECTIVE IN PREVENTING ALKALI ALUMINATES FORMING DURING THE ETCHING OPERATION FROM DEPSOITING AS A SCALE, THE METHOD OF DECREASING THE ETCHING RATE COMPRISING THE STEP OF INCLUDING IN SAID ETCHING BATH A METAL ION SELECTED FROM THE GROUP CONSISTING OF STRONTIUM BARIUM AND CALCIUM IONS IN AMOUNTS RANGING FROM 3% TO 140% BASED ON THE WEIGHT OF THE SCALE INHIBITOR.
References Cited (Backward Citations)
US2657981A
Cited
US2673143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |