Patent US2519230A successfully refreshed from Google Patents.
US4155782A
Expired / Lapsed
US
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Watch case
Assignee: Toshiba Corp
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Filing: 1976-11-09
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Granted: 1979-05-22
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Expires: 1996-11-09
Abstract
Abstract A watch case made of an alloy consisting essentially of 30 to 45% by weight of Cr, 2.5 to 5.0% by weight of Al and the balance essentially Ni, said alloy having been subjected to an aging treatment. The watch case is high in hardness and corrosion resistance and presents a good mirror-like surface.
Inventors
- 👤 Kazumi Shimotori
- 👤 Itaru Watanabe
- 👤 Masako Nakahashi
- 👤 Shuichi Komatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:45
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; G; G04; G04B; G04B37/00; G04B37/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
60 words
A watch case having a good mirror-like surface, said watch case made of an alloy consisting essentially of 30 to 45% by weight of Cr, 2.5 to 5% by weight of Al and the balance essentially Ni, said alloy having been subjected to an aging treatment, and said alloy having a Vickers hardness larger than 500 after said aging treatment.
Claim 2
Dependent Claim
60 words
A watch case having a good mirror-like surface, said watch case made of an alloy consisting essentially of 30 to 45% by weight of Cr, 2.5 to 5% by weight of Al and the balance essentially Ni, said alloy having been subjected to an aging treatment, and said alloy having a Vickers hardness larger than 500 after said aging treatment.
Claim 3
Dependent Claim
26 words
The watch case of claim 1 wherein said alloy consists essentially of 37.99% by weight of Cr, 3.8% by weight of Al and the balance Ni.
Claim 4
Dependent Claim
25 words
The watch case of claim 1 wherein said aging treatment is carried out at a temperature between 500° and 950° C. for about 30 minutes.
Claim 5
Dependent Claim
25 words
The watch case of claim 3 wherein said aging treatment is carried out at a temperature of 550° to 700° C. for about 30 minutes.
Claim 6
Dependent Claim
20 words
The watch case of claim 1 wherein said alloy after the aging treatment has a Vickers hardness larger than 600.
References Cited (Backward Citations)
US3015558A
Cited
US3635703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-21 | 1982-11-20 | 1983-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-21 | 1986-11-20 | 1987-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-21 | 1990-11-20 | 1991-05-22 | $7700.00 | Window Closed / Lapsed |