US3314890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkali etching solution for aluminum
Assignee: Pennwalt Corp
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Filing: 1965-04-09
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Granted: 1967-04-18
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Expires: 1985-04-09
Abstract
No abstract record available.
Inventors
- 👤 Smith Harold Vernon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:24
CPC Classifications
C; C23; C23F; C23F3/00; C23F3/02; C23F1/00; C23F1/10; C23F1/14; C23F1/32; C23F1/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
THE AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF ALKALI METAL HYDROXIDE, WATER SOLUBLE HEXAVALENT CHROMIUM IONS, WATER SOLUBLE FLUORIDE ION, AND AT LEAST ONE SURFACE MODIFYING AGENT SELECTED FROM THE GROUP CONSISTING OF MANNITOL, ASCORBIC ACID, SORBOSE, SORBITOL, TANNIC ACID, ETHYLENEDIAMINETETRAACETIC ACID, SODIUM CHROM GLUCOSATE, DIGLYCOLIC ACID, PICOLINIC ACID, ASPARTIC ACID, DITHIOXAMIDE, D-GLYCONOLACTONE, AND L-RHAMNOSE IN WHICH THE ALKALI METAL HYDROXIDE CONCENTRATION IS WITHIN THE RANGE OF 13 TO 90 GRAMS PER LITER, IN WHICH THE WATER SOLUBLE HEXAVALENT CHROMIUM ION CONCENTRATION IS WITHIN THE RANGE OF 0.02% TO 4.5% OF THE ALKALI METAL HYDROXIDE CONCENTRATION, IN WHICH THE WATER SOLUBLE FLUORIDE ION CONCENTRATION IS WITHIN THE RANGE OF 0.04% TO 2% OF THE ALKALI METAL HYDROXIDE CENTRATION, AND IN WHICH SOLUTION THE CONCENTRATION OF THE SAID SURFACE MODIFYING AGENT IS AT LEAST THE SUM OF 100% OF THE WATE SOLUBLE CHROMIUM ION CONCENTRATION AND 2.0% OF THE ALKALI METAL HYDROXIDE CONCENTRATION.
Claim 2
Dependent Claim
150 words
THE AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF ALKALI METAL HYDROXIDE, WATER SOLUBLE HEXAVALENT CHROMIUM IONS, WATER SOLUBLE FLUORIDE ION, AND AT LEAST ONE SURFACE MODIFYING AGENT SELECTED FROM THE GROUP CONSISTING OF MANNITOL, ASCORBIC ACID, SORBOSE, SORBITOL, TANNIC ACID, ETHYLENEDIAMINETETRAACETIC ACID, SODIUM CHROM GLUCOSATE, DIGLYCOLIC ACID, PICOLINIC ACID, ASPARTIC ACID, DITHIOXAMIDE, D-GLYCONOLACTONE, AND L-RHAMNOSE IN WHICH THE ALKALI METAL HYDROXIDE CONCENTRATION IS WITHIN THE RANGE OF 13 TO 90 GRAMS PER LITER, IN WHICH THE WATER SOLUBLE HEXAVALENT CHROMIUM ION CONCENTRATION IS WITHIN THE RANGE OF 0.02% TO 4.5% OF THE ALKALI METAL HYDROXIDE CONCENTRATION, IN WHICH THE WATER SOLUBLE FLUORIDE ION CONCENTRATION IS WITHIN THE RANGE OF 0.04% TO 2% OF THE ALKALI METAL HYDROXIDE CENTRATION, AND IN WHICH SOLUTION THE CONCENTRATION OF THE SAID SURFACE MODIFYING AGENT IS AT LEAST THE SUM OF 100% OF THE WATE SOLUBLE CHROMIUM ION CONCENTRATION AND 2.0% OF THE ALKALI METAL HYDROXIDE CONCENTRATION.
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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) | 1970-04-17 | 1970-10-17 | 1971-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-17 | 1974-10-17 | 1975-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-17 | 1978-10-17 | 1979-04-18 | $7700.00 | Window Closed / Lapsed |