US3666638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for anodizing aluminum materials
Assignee: FRANK L HARRIS
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Filing: 1970-04-21
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Granted: 1972-05-30
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Expires: 1990-04-21
Abstract
Abstract A METHOD FOR PRODUCING AN ABRASION RESISTANT ANODIC COATING WITH A DESIRED CORROSION RESISTANT CHARACTERISTIC ON THE SURFACE OF ALUMINUM AND ALLOYS THEREOF COMPRISING THE STEPS OF: (1) INITIALLY ANODIZING THE ALUMINUM MATERIAL IN AN ACID BATH AT CERTAIN CONDITIONS OF TEMPERATURE, CURRENT DENSITY, VOLTAGE ETC., IN ORDER TO PRODUCE A DENSE, HARD ANODIC COATING; (2) SUBJECT THE MATERIAL TO ANOTHER ACID ANODIZING BATH AT CERTAIN TEMPERATURES, CURRENT DENSITY VOLTAGE, ETC., IN ORDER TO DEVELOP A CORROSION RESISTANT ANODIC COATING BETWEEN THE HARD ANODIC COATING AND THE BASE ALUMINUM MATERIAL THEREBY MINIMIZING THE EFFECTS OF THE MICROSPOPIC DISCONTINUITIES, AND THEN (3) SEALING.
Inventors
- 👤 Frank L Harris
- 👤 Sidney Levine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:47
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/12
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |