Patent US3663327A successfully refreshed from Google Patents.
US3663327A
Expired / Lapsed
US
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Formulation and method for brightening aluminum
Assignee: Chemed Corp
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Filing: 1969-08-13
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Granted: 1972-05-16
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Expires: 1989-08-13
Abstract
Abstract The present invention is directed to an aluminum brightener formulation which includes water, phosphoric acid, a transition metal compound and a wetting agent. Aluminum may be brightened by a method which includes the step of spraying or brushing an aluminum surface with the present formulation at a moderate temperature.
Inventors
- 👤 Jack Henry Ritzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:38
CPC Classifications
C; C23; C23F; C23F3/00; C23F3/02; C23F3/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB403373A
Cited
GB625834A
Cited
FR967207A
Cited
US2760891A
Cited
US3004056A
Cited
US3194704A
Cited
US3240633A
Cited
GB1088287A
Cited
US3448055A
Cited
US3301787A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |