Patent US4640625A successfully refreshed from Google Patents.
US4640625A
Expired / Lapsed
US
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External member for a watch
Assignee: Citizen Watch Co Ltd
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Filing: 1986-02-28
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Granted: 1987-02-03
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Expires: 2006-02-28
Abstract
Abstract A body of an external member is made of an aluminum alloy containing 0.5-2.5% of magnesium by weight, less than 0.01% of silicon by weight, and less than 0.01% of iron by weight. An anodic oxide film is formed on the body.
Inventors
- 👤 Hachiro Kushida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:14
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C22; C22C; C22C21/00; C22C21/06; G; G04; G04B; G04B37/00; G04B37/22; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12528
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
44 words
An external member for a watch comprising: a body made of an aluminum alloy containing 0.5-2.5% of magnesium by weight, less than 0.01% of silicon by weight, and less than 0.01% of iron by weight; and an anodic oxide film formed on the body.
Claim 2
Dependent Claim
44 words
An external member for a watch comprising: a body made of an aluminum alloy containing 0.5-2.5% of magnesium by weight, less than 0.01% of silicon by weight, and less than 0.01% of iron by weight; and an anodic oxide film formed on the body.
Claim 3
Dependent Claim
19 words
The external member according to claim 1 further comprising a golden dye film formed on the anodic oxide film.
Claim 4
Dependent Claim
21 words
The external member according to claim 1 wherein the anodic oxide film has a thickness between 10 μm and 25 μm.
Claim 5
Dependent Claim
13 words
The external member according to claim 1 wherein the body has hair lines.
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) | 1990-02-02 | 1990-08-04 | 1991-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-02 | 1994-08-04 | 1995-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-02 | 1998-08-04 | 1999-02-03 | $7700.00 | Window Closed / Lapsed |