Patent US3718548A successfully refreshed from Google Patents.
US3718548A
Expired / Lapsed
US
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Process for the coloring of anodized layers on aluminum
Assignee: Rio Tinto Switzerland AG
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Filing: 1971-04-13
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Granted: 1973-02-27
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Expires: 1991-04-13
Abstract
Abstract THE INVENTION RELATES TO A PROCESS FOR COLORING OXIDE LAYERS ON ALUMINUM. THIS CONSISTS IN USING MELTABLE ORGANIC COLORING MATTERS IN UNDISSOLVED STATE, WHICH ARE BROUGHT INTO CONTACT WITH THE OXIDE LAYER AND MOLTEN INTO THE PORES OF THE OXIDE LAYER BY HEATING,
Inventors
- 👤 J Paulet
- 👤 F Endtinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:01
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/18; C25D11/24; C25D11/243; C25D11/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |