Patent US3301787A successfully refreshed from Google Patents.
US3301787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical brightening of aluminum
Assignee: SAMUEL L COHN
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Filing: 1965-05-24
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Granted: 1967-01-31
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Expires: 1985-05-24
Abstract
No abstract record available.
Inventors
- 👤 Charles C Cohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:56
CPC Classifications
C; C23; C23F; C23F3/00; C23F3/02; C23F3/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A BATH FOR THE CHEMICAL BRIGHTENING OF ALUMINUM WHEN USED AT A TEMPERATURE IN EXCESS OF 150*F. COMPRISING AS ESSENTIAL CONSTITUENTS PHOSPHORIC ACID AND WATER, WITH THE FREE PHOSPHORIC ACID CONTENT IN THE RANGE FROM 40% TO 98% BY WEIGHT, SAID BATH HAVING DISPERSED THEREIN, AT ITS OPERATING TEMPERATURE IN THE RANGE 150*F. TO BOILING, AN OILY MATERIAL INSOLUBLE IN, AND NON-EMULSIFIABLE IN, THE BATH, THE CONTENT OF THE OILY MATERIAL BEING SUBSTANTIALLY IN THE RANGE FROM 0.0005% TO 1.0%.
Claim 2
Dependent Claim
80 words
A BATH FOR THE CHEMICAL BRIGHTENING OF ALUMINUM WHEN USED AT A TEMPERATURE IN EXCESS OF 150*F. COMPRISING AS ESSENTIAL CONSTITUENTS PHOSPHORIC ACID AND WATER, WITH THE FREE PHOSPHORIC ACID CONTENT IN THE RANGE FROM 40% TO 98% BY WEIGHT, SAID BATH HAVING DISPERSED THEREIN, AT ITS OPERATING TEMPERATURE IN THE RANGE 150*F. TO BOILING, AN OILY MATERIAL INSOLUBLE IN, AND NON-EMULSIFIABLE IN, THE BATH, THE CONTENT OF THE OILY MATERIAL BEING SUBSTANTIALLY IN THE RANGE FROM 0.0005% TO 1.0%.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |